{"id":85033,"date":"2026-07-26T22:40:41","date_gmt":"2026-07-26T14:40:41","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/85033.html"},"modified":"2026-07-26T22:40:41","modified_gmt":"2026-07-26T14:40:41","slug":"%e5%9b%9e%e6%ba%af%e9%a2%98%e7%9b%ae%ef%bc%9a%e5%8f%a3%e7%ae%97%e9%9a%be%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/85033.html","title":{"rendered":"\u56de\u6eaf\u9898\u76ee\uff1a\u53e3\u7b97\u96be\u9898"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u9898\u76ee<\/li>\n<li>\n<ul>\n<li>\u6807\u9898\u548c\u51fa\u5904<\/li>\n<li>\u96be\u5ea6<\/li>\n<li>\u9898\u76ee\u63cf\u8ff0<\/li>\n<li>\n<ul>\n<li>\u8981\u6c42<\/li>\n<li>\u793a\u4f8b<\/li>\n<li>\u6570\u636e\u8303\u56f4<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u89e3\u6cd5<\/li>\n<li>\n<ul>\n<li>\u601d\u8def\u548c\u7b97\u6cd5<\/li>\n<li>\u4ee3\u7801<\/li>\n<li>\u590d\u6742\u5ea6\u5206\u6790<\/li>\n<\/ul>\n<\/li>\n<li>\u62d3\u5c55\u95ee\u9898<\/li>\n<li>\n<ul>\n<li>\u9898\u76ee\u63cf\u8ff0<\/li>\n<li>\u89e3\u6cd5\u5206\u6790<\/li>\n<li>\u4ee3\u7801<\/li>\n<li>\u590d\u6742\u5ea6\u5206\u6790<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u9898\u76ee<\/h2>\n<h3>\u6807\u9898\u548c\u51fa\u5904<\/h3>\n<p>\u6807\u9898&#xff1a;\u53e3\u7b97\u96be\u9898<\/p>\n<p>\u51fa\u5904&#xff1a;1307. \u53e3\u7b97\u96be\u9898<\/p>\n<h3>\u96be\u5ea6<\/h3>\n<p>9 \u7ea7<\/p>\n<h3>\u9898\u76ee\u63cf\u8ff0<\/h3>\n<h4>\u8981\u6c42<\/h4>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u65b9\u7a0b&#xff0c;\u5de6\u8fb9\u7528 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        words<\/p>\n<p>       \\\\texttt{words}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words<\/span><\/span><\/span><\/span><\/span><\/span> \u8868\u793a&#xff0c;\u53f3\u8fb9\u7528 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        result<\/p>\n<p>       \\\\texttt{result}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">result<\/span><\/span><\/span><\/span><\/span><\/span> \u8868\u793a\u3002<\/p>\n<p>\u9700\u8981\u6839\u636e\u4ee5\u4e0b\u89c4\u5219\u68c0\u67e5\u65b9\u7a0b\u662f\u5426\u53ef\u89e3&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u5b57\u7b26\u90fd\u4f1a\u88ab\u89e3\u7801\u6210\u4e00\u4f4d\u6570\u5b57&#xff08;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         0<\/p>\n<p>        \\\\texttt{0}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">0<\/span><\/span><\/span><\/span><\/span><\/span> \u5230 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         9<\/p>\n<p>        \\\\texttt{9}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">9<\/span><\/span><\/span><\/span><\/span><\/span>&#xff09;\u3002<\/li>\n<li>\u4e0d\u540c\u7684\u5b57\u7b26\u5fc5\u987b\u6620\u5c04\u5230\u4e0d\u540c\u7684\u6570\u5b57\u3002<\/li>\n<li>\u6bcf\u4e2a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         words[i]<\/p>\n<p>        \\\\texttt{words[i]}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7778em;vertical-align: -0.0833em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words[i]<\/span><\/span><\/span><\/span><\/span><\/span> \u548c <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         result<\/p>\n<p>        \\\\texttt{result}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">result<\/span><\/span><\/span><\/span><\/span><\/span> \u90fd\u4f1a\u88ab\u89e3\u7801\u6210\u4e00\u4e2a\u6ca1\u6709\u524d\u5bfc\u96f6\u7684\u6570\u5b57\u3002<\/li>\n<li>\u5de6\u4fa7\u6570\u5b57&#xff08;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         words<\/p>\n<p>        \\\\texttt{words}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words<\/span><\/span><\/span><\/span><\/span><\/span>&#xff09;\u4e4b\u548c\u7b49\u4e8e\u53f3\u4fa7\u6570\u5b57&#xff08;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         result<\/p>\n<p>        \\\\texttt{result}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">result<\/span><\/span><\/span><\/span><\/span><\/span>&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c\u65b9\u7a0b\u53ef\u89e3&#xff0c;\u8fd4\u56de <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        true<\/p>\n<p>       \\\\texttt{true}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.5536em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">true<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5426\u5219\u8fd4\u56de <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        false<\/p>\n<p>       \\\\texttt{false}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">false<\/span><\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<h4>\u793a\u4f8b<\/h4>\n<p>\u793a\u4f8b 1&#xff1a;<\/p>\n<p>\u8f93\u5165&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        words<\/p>\n<p>        \u00a0<\/p>\n<p>        &#061;<\/p>\n<p>        \u00a0<\/p>\n<p>        [&#034;SEND&#034;,&#034;MORE&#034;],<\/p>\n<p>        \u00a0<\/p>\n<p>        result<\/p>\n<p>        \u00a0<\/p>\n<p>        &#061;<\/p>\n<p>        \u00a0<\/p>\n<p>        &#034;MONEY&#034;<\/p>\n<p>       \\\\texttt{words &#061; [&#034;SEND&#034;,&#034;MORE&#034;], result &#061; &#034;MONEY&#034;}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8333em;vertical-align: -0.1389em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words\u00a0&#061;\u00a0[&#034;SEND&#034;,&#034;MORE&#034;],\u00a0result\u00a0&#061;\u00a0&#034;MONEY&#034;<\/span><\/span><\/span><\/span><\/span><\/span> \u8f93\u51fa&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        true<\/p>\n<p>       \\\\texttt{true}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.5536em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">true<\/span><\/span><\/span><\/span><\/span><\/span> \u89e3\u91ca&#xff1a;\u6620\u5c04 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018S\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        9<\/p>\n<p>       \\\\texttt{&#096;S&#039;} \\\\rightarrow \\\\texttt{9}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018S\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">9<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018E\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        5<\/p>\n<p>       \\\\texttt{&#096;E&#039;} \\\\rightarrow \\\\texttt{5}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018E\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">5<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018N\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        6<\/p>\n<p>       \\\\texttt{&#096;N&#039;} \\\\rightarrow \\\\texttt{6}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018N\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">6<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018D\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        7<\/p>\n<p>       \\\\texttt{&#096;D&#039;} \\\\rightarrow \\\\texttt{7}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018D\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">7<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018M\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        1<\/p>\n<p>       \\\\texttt{&#096;M&#039;} \\\\rightarrow \\\\texttt{1}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018M\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">1<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018O\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        0<\/p>\n<p>       \\\\texttt{&#096;O&#039;} \\\\rightarrow \\\\texttt{0}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018O\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">0<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018R\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        8<\/p>\n<p>       \\\\texttt{&#096;R&#039;} \\\\rightarrow \\\\texttt{8}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018R\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">8<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018Y\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        2<\/p>\n<p>       \\\\texttt{&#096;Y&#039;} \\\\rightarrow \\\\texttt{2}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018Y\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">2<\/span><\/span><\/span><\/span><\/span><\/span>\u3002 \u65b9\u7a0b\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        &#034;SEND&#034;<\/p>\n<p>        &#043;<\/p>\n<p>        &#034;MORE&#034;<\/p>\n<p>        &#061;<\/p>\n<p>        &#034;MONEY&#034;<\/p>\n<p>       \\\\texttt{&#034;SEND&#034;} &#043; \\\\texttt{&#034;MORE&#034;} &#061; \\\\texttt{&#034;MONEY&#034;}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em;vertical-align: -0.0833em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">&#034;SEND&#034;<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">&#034;MORE&#034;<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">&#034;MONEY&#034;<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;\u65b9\u7a0b\u7684\u89e3\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        9567<\/p>\n<p>        &#043;<\/p>\n<p>        1085<\/p>\n<p>        &#061;<\/p>\n<p>        10652<\/p>\n<p>       \\\\texttt{9567} &#043; \\\\texttt{1085} &#061; \\\\texttt{10652}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em;vertical-align: -0.0833em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">9567<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">1085<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">10652<\/span><\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<p>\u793a\u4f8b 2&#xff1a;<\/p>\n<p>\u8f93\u5165&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        words<\/p>\n<p>        \u00a0<\/p>\n<p>        &#061;<\/p>\n<p>        \u00a0<\/p>\n<p>        [&#034;SIX&#034;,&#034;SEVEN&#034;,&#034;SEVEN&#034;],<\/p>\n<p>        \u00a0<\/p>\n<p>        result<\/p>\n<p>        \u00a0<\/p>\n<p>        &#061;<\/p>\n<p>        \u00a0<\/p>\n<p>        &#034;TWENTY&#034;<\/p>\n<p>       \\\\texttt{words &#061; [&#034;SIX&#034;,&#034;SEVEN&#034;,&#034;SEVEN&#034;], result &#061; &#034;TWENTY&#034;}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8333em;vertical-align: -0.1389em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words\u00a0&#061;\u00a0[&#034;SIX&#034;,&#034;SEVEN&#034;,&#034;SEVEN&#034;],\u00a0result\u00a0&#061;\u00a0&#034;TWENTY&#034;<\/span><\/span><\/span><\/span><\/span><\/span> \u8f93\u51fa&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        true<\/p>\n<p>       \\\\texttt{true}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.5536em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">true<\/span><\/span><\/span><\/span><\/span><\/span> \u89e3\u91ca&#xff1a;\u6620\u5c04 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018S\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        6<\/p>\n<p>       \\\\texttt{&#096;S&#039;} \\\\rightarrow \\\\texttt{6}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018S\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">6<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018I\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        5<\/p>\n<p>       \\\\texttt{&#096;I&#039;} \\\\rightarrow \\\\texttt{5}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018I\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">5<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018X\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        0<\/p>\n<p>       \\\\texttt{&#096;X&#039;} \\\\rightarrow \\\\texttt{0}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018X\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">0<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018E\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        8<\/p>\n<p>       \\\\texttt{&#096;E&#039;} \\\\rightarrow \\\\texttt{8}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018E\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">8<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018V\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        7<\/p>\n<p>       \\\\texttt{&#096;V&#039;} \\\\rightarrow \\\\texttt{7}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018V\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">7<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018N\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        2<\/p>\n<p>       \\\\texttt{&#096;N&#039;} \\\\rightarrow \\\\texttt{2}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018N\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">2<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018T\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        1<\/p>\n<p>       \\\\texttt{&#096;T&#039;} \\\\rightarrow \\\\texttt{1}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018T\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">1<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018W\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        \u20193\u2019<\/p>\n<p>       \\\\texttt{&#096;W&#039;} \\\\rightarrow \\\\texttt{&#039;3&#039;}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018W\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u20193\u2019<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2018Y\u2019<\/p>\n<p>        \u2192<\/p>\n<p>        4<\/p>\n<p>       \\\\texttt{&#096;Y&#039;} \\\\rightarrow \\\\texttt{4}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">\u2018Y\u2019<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">4<\/span><\/span><\/span><\/span><\/span><\/span>\u3002 \u65b9\u7a0b\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        &#034;SIX&#034;<\/p>\n<p>        &#043;<\/p>\n<p>        &#034;SEVEN&#034;<\/p>\n<p>        &#043;<\/p>\n<p>        &#034;SEVEN&#034;<\/p>\n<p>        &#061;<\/p>\n<p>        &#034;TWENTY&#034;<\/p>\n<p>       \\\\texttt{&#034;SIX&#034;} &#043; \\\\texttt{&#034;SEVEN&#034;} &#043; \\\\texttt{&#034;SEVEN&#034;} &#061; \\\\texttt{&#034;TWENTY&#034;}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em;vertical-align: -0.0833em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">&#034;SIX&#034;<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em;vertical-align: -0.0833em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">&#034;SEVEN&#034;<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">&#034;SEVEN&#034;<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">&#034;TWENTY&#034;<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;\u65b9\u7a0b\u7684\u89e3\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        650<\/p>\n<p>        &#043;<\/p>\n<p>        68782<\/p>\n<p>        &#043;<\/p>\n<p>        68782<\/p>\n<p>        &#061;<\/p>\n<p>        138214<\/p>\n<p>       \\\\texttt{650} &#043; \\\\texttt{68782} &#043; \\\\texttt{68782} &#061; \\\\texttt{138214}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em;vertical-align: -0.0833em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">650<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em;vertical-align: -0.0833em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">68782<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">68782<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">138214<\/span><\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<p>\u793a\u4f8b 3&#xff1a;<\/p>\n<p>\u8f93\u5165&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        words<\/p>\n<p>        \u00a0<\/p>\n<p>        &#061;<\/p>\n<p>        \u00a0<\/p>\n<p>        [&#034;LEET&#034;,&#034;CODE&#034;],<\/p>\n<p>        \u00a0<\/p>\n<p>        result<\/p>\n<p>        \u00a0<\/p>\n<p>        &#061;<\/p>\n<p>        \u00a0<\/p>\n<p>        &#034;POINT&#034;<\/p>\n<p>       \\\\texttt{words &#061; [&#034;LEET&#034;,&#034;CODE&#034;], result &#061; &#034;POINT&#034;}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8333em;vertical-align: -0.1389em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words\u00a0&#061;\u00a0[&#034;LEET&#034;,&#034;CODE&#034;],\u00a0result\u00a0&#061;\u00a0&#034;POINT&#034;<\/span><\/span><\/span><\/span><\/span><\/span> \u8f93\u51fa&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        false<\/p>\n<p>       \\\\texttt{false}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">false<\/span><\/span><\/span><\/span><\/span><\/span> \u89e3\u91ca&#xff1a;\u4e0d\u5b58\u5728\u6ee1\u8db3\u65b9\u7a0b\u7684\u6620\u5c04&#xff0c;\u6240\u4ee5\u8fd4\u56de <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        false<\/p>\n<p>       \\\\texttt{false}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">false<\/span><\/span><\/span><\/span><\/span><\/span>\u3002 \u6ce8\u610f\u4e0d\u540c\u7684\u5b57\u6bcd\u4e0d\u80fd\u6620\u5c04\u5230\u76f8\u540c\u7684\u6570\u5b57\u3002<\/p>\n<h4>\u6570\u636e\u8303\u56f4<\/h4>\n<ul>\n<li><span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         2<\/p>\n<p>         \u2264<\/p>\n<p>         words.length<\/p>\n<p>         \u2264<\/p>\n<p>         5<\/p>\n<p>        \\\\texttt{2} \\\\le \\\\texttt{words.length} \\\\le \\\\texttt{5}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7719em;vertical-align: -0.136em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">2<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8582em;vertical-align: -0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words.length<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">5<\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<li><span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         1<\/p>\n<p>         \u2264<\/p>\n<p>          words[i].length,<\/p>\n<p>          \u00a0<\/p>\n<p>          results.length<\/p>\n<p>         \u2264<\/p>\n<p>         7<\/p>\n<p>        \\\\texttt{1} \\\\le \\\\texttt{words[i].length, results.length} \\\\le \\\\texttt{7}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7719em;vertical-align: -0.136em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">1<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.9167em;vertical-align: -0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words[i].length,\u00a0results.length<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">7<\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<li><span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         words[i],<\/p>\n<p>         \u00a0<\/p>\n<p>         result<\/p>\n<p>        \\\\texttt{words[i], result}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8333em;vertical-align: -0.1389em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">words[i],\u00a0result<\/span><\/span><\/span><\/span><\/span><\/span> \u53ea\u542b\u6709\u5927\u5199\u82f1\u8bed\u5b57\u6bcd<\/li>\n<li>\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528\u7684\u4e0d\u540c\u5b57\u7b26\u6570\u6700\u5927\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         10<\/p>\n<p>        \\\\texttt{10}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6111em\"><\/span><span class=\"mord text\"><span class=\"mord texttt\">10<\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<h2>\u89e3\u6cd5<\/h2>\n<h3>\u601d\u8def\u548c\u7b97\u6cd5<\/h3>\n<p>\u8fd9\u9053\u9898\u8981\u6c42\u5224\u65ad\u7ed9\u5b9a\u7684\u65b9\u7a0b\u662f\u5426\u53ef\u89e3&#xff0c;\u9700\u8981\u679a\u4e3e\u6240\u6709\u53ef\u80fd\u7684\u5b57\u6bcd\u548c\u6570\u5b57\u4e4b\u95f4\u7684\u6620\u5c04\u5173\u7cfb&#xff0c;\u4f7f\u7528\u56de\u6eaf\u7684\u505a\u6cd5\u5224\u65ad\u3002\u5982\u679c\u56de\u6eaf\u8fc7\u7a0b\u4e2d\u6ca1\u6709\u526a\u679d&#xff0c;\u5219\u53ef\u80fd\u7684\u6620\u5c04\u5173\u7cfb\u4e3a\u9636\u4e58\u7ea7&#xff0c;\u65f6\u95f4\u590d\u6742\u5ea6\u8fc7\u9ad8\u3002\u56e0\u6b64&#xff0c;\u56de\u6eaf\u8fc7\u7a0b\u4e2d\u9700\u8981\u4f7f\u7528\u526a\u679d\u51cf\u5c11\u641c\u7d22\u7a7a\u95f4&#xff0c;\u6392\u9664\u4e0d\u53ef\u80fd\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u9996\u5148\u5c06\u65b9\u7a0b\u4e2d\u7684\u6240\u6709\u7684\u6570\u90fd\u79fb\u5230\u7b49\u53f7\u5de6\u8fb9&#xff0c;\u4f7f\u7b49\u53f7\u53f3\u8fb9\u7b49\u4e8e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        0<\/p>\n<p>       0<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">0<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5e76\u5bf9\u6bcf\u4e2a\u5b57\u6bcd\u5408\u5e76\u540c\u7c7b\u9879&#xff0c;\u5f97\u5230\u6bcf\u4e2a\u5b57\u6bcd\u5bf9\u5e94\u7684\u7cfb\u6570&#xff0c;\u7136\u540e\u5206\u522b\u679a\u4e3e\u6bcf\u4e2a\u5b57\u6bcd\u53ef\u80fd\u6620\u5c04\u5230\u7684\u6570\u5b57\u3002\u5982\u679c\u4e00\u4e2a\u5b57\u6bcd\u7684\u7cfb\u6570\u7edd\u5bf9\u503c\u8d8a\u5927&#xff0c;\u5219\u8be5\u5b57\u6bcd\u53ef\u80fd\u6620\u5c04\u5230\u7684\u6570\u5b57\u8d8a\u5c11&#xff0c;\u56e0\u6b64\u4e3a\u4e86\u51cf\u5c11\u641c\u7d22\u7a7a\u95f4&#xff0c;\u5e94\u6309\u7167\u7cfb\u6570\u7edd\u5bf9\u503c\u4ece\u5927\u5230\u5c0f\u7684\u987a\u5e8f\u5206\u522b\u679a\u4e3e\u6bcf\u4e2a\u5b57\u6bcd\u53ef\u80fd\u6620\u5c04\u5230\u7684\u6570\u5b57\u3002<\/p>\n<p>\u4e3a\u4e86\u6309\u7167\u7cfb\u6570\u7edd\u5bf9\u503c\u4ece\u5927\u5230\u5c0f\u7684\u987a\u5e8f\u679a\u4e3e&#xff0c;\u9700\u8981\u5c06\u6240\u6709\u5b57\u6bcd\u6309\u7167\u7cfb\u6570\u7684\u6b63\u8d1f\u6027\u5206\u6210\u4e24\u7ec4&#xff0c;\u540c\u4e00\u7ec4\u4e2d\u7684\u5b57\u6bcd\u6309\u7167\u7cfb\u6570\u7684\u7edd\u5bf9\u503c\u4ece\u5927\u5230\u5c0f\u7684\u987a\u5e8f\u6392\u5e8f\u3002\u7cfb\u6570\u4e3a\u96f6\u7684\u5b57\u6bcd\u53ef\u4ee5\u5ffd\u7565&#xff0c;\u7406\u7531\u5982\u4e0b\u3002<\/p>\n<li>\n<p>\u7cfb\u6570\u4e3a\u96f6\u7684\u5b57\u6bcd\u53d6\u4efb\u4f55\u503c\u90fd\u4e0d\u4f1a\u6539\u53d8\u65b9\u7a0b\u7684\u503c\u3002<\/p>\n<\/li>\n<li>\n<p>\u65b9\u7a0b\u4e2d\u7684\u4e0d\u540c\u5b57\u6bcd\u6570\u6700\u5927\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          10<\/p>\n<p>         10<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">10<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u56e0\u6b64\u5f53\u7cfb\u6570\u4e0d\u4e3a\u96f6\u7684\u5b57\u6bcd\u53d6\u503c\u90fd\u786e\u5b9a\u4e4b\u540e&#xff0c;\u7cfb\u6570\u4e3a\u96f6\u7684\u5b57\u6bcd\u4e00\u5b9a\u53ef\u4ee5\u53d6\u5230\u548c\u5176\u4ed6\u5b57\u6bcd\u90fd\u4e0d\u91cd\u590d\u7684\u53d6\u503c\u3002<\/p>\n<\/li>\n<p>\u56de\u6eaf\u8fc7\u7a0b\u4e2d&#xff0c;\u6bcf\u6b21\u53d6\u5c1a\u672a\u904d\u5386\u7684\u5b57\u6bcd\u4e2d\u7684\u7cfb\u6570\u7edd\u5bf9\u503c\u6700\u5927\u7684\u5b57\u6bcd&#xff0c;\u5982\u679c\u540c\u65f6\u5b58\u5728\u6700\u5927\u7edd\u5bf9\u503c\u7684\u6b63\u7cfb\u6570\u548c\u8d1f\u7cfb\u6570\u5219\u53d6\u6b63\u7cfb\u6570\u3002\u6bcf\u4e2a\u5b57\u6bcd\u7684\u53d6\u503c\u8303\u56f4\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        [<\/p>\n<p>        0<\/p>\n<p>        ,<\/p>\n<p>        9<\/p>\n<p>        ]<\/p>\n<p>       [0, 9]<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">[<\/span><span class=\"mord\">0<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">9<\/span><span class=\"mclose\">]<\/span><\/span><\/span><\/span><\/span> \u4e2d\u7684\u6574\u6570&#xff0c;\u4e0d\u540c\u5b57\u6bcd\u7684\u53d6\u503c\u4e0d\u540c&#xff0c;\u5e76\u6ee1\u8db3\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\u3002<\/p>\n<li>\n<p>\u5982\u679c\u4e00\u4e2a\u5b57\u6bcd\u4f4d\u4e8e\u591a\u4f4d\u6570\u7684\u6700\u9ad8\u4f4d&#xff0c;\u5219\u8be5\u5b57\u6bcd\u7684\u53d6\u503c\u4e0d\u80fd\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          0<\/p>\n<p>         0<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">0<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<\/li>\n<li>\n<p>\u904d\u5386\u5230\u7684\u5b57\u6bcd\u7684\u53d6\u503c\u5b58\u5728\u4e0a\u754c&#xff0c;\u5982\u679c\u7b26\u53f7\u76f8\u53cd\u7684\u5c1a\u672a\u904d\u5386\u7684\u5b57\u6bcd\u7684\u7cfb\u6570\u52a0\u6743\u548c\u7684\u7edd\u5bf9\u503c\u6700\u5927\u65f6&#xff0c;\u65b9\u7a0b\u7684\u7b49\u53f7\u5de6\u8fb9\u7684\u7b26\u53f7\u4ecd\u4e3a\u5f53\u524d\u5b57\u6bcd\u7684\u7b26\u53f7&#xff0c;\u5219\u5f53\u524d\u5b57\u6bcd\u7684\u53d6\u503c\u8fc7\u5927\u3002<\/p>\n<\/li>\n<p>\u8003\u8651\u793a\u4f8b 1 \u7684\u65b9\u7a0b&#xff0c;\u5176\u5f62\u5f0f\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         SEND<\/p>\n<p>         \u203e<\/p>\n<p>        &#043;<\/p>\n<p>         MORE<\/p>\n<p>         \u203e<\/p>\n<p>        &#061;<\/p>\n<p>         MONEY<\/p>\n<p>         \u203e<\/p>\n<p>       \\\\overline{\\\\text{SEND}} &#043; \\\\overline{\\\\text{MORE}} &#061; 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class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8833em\"><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord text\"><span class=\"mord\">MORE<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.8033em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"overline-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8833em\"><\/span><span class=\"mord overline\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8833em\"><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord text\"><span class=\"mord\">MONEY<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.8033em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"overline-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u3002\u5c06\u6240\u6709\u7684\u6570\u90fd\u79fb\u5230\u7b49\u53f7\u5de6\u8fb9&#xff0c;\u5f97\u5230 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         SEND<\/p>\n<p>         \u203e<\/p>\n<p>        &#043;<\/p>\n<p>         MORE<\/p>\n<p>         \u203e<\/p>\n<p>        \u2212<\/p>\n<p>         MONEY<\/p>\n<p>         \u203e<\/p>\n<p>        &#061;<\/p>\n<p>        0<\/p>\n<p>       \\\\overline{\\\\text{SEND}} &#043; \\\\overline{\\\\text{MORE}} &#8211; \\\\overline{\\\\text{MONEY}} &#061; 0<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.9667em;vertical-align: -0.0833em\"><\/span><span class=\"mord overline\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8833em\"><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord text\"><span class=\"mord\">SEND<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.8033em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"overline-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.9667em;vertical-align: -0.0833em\"><\/span><span class=\"mord overline\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8833em\"><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord text\"><span class=\"mord\">MORE<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.8033em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"overline-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8833em\"><\/span><span class=\"mord overline\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8833em\"><span class=\"\" style=\"top: -3em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord text\"><span class=\"mord\">MONEY<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.8033em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"overline-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">0<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u7136\u540e\u5408\u5e76\u540c\u7c7b\u9879\u3002<\/p>\n<p><span class=\"katex--display\"><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>             (<\/p>\n<p>             1000<\/p>\n<p>             \u00d7<\/p>\n<p>             S<\/p>\n<p>             &#043;<\/p>\n<p>             100<\/p>\n<p>             \u00d7<\/p>\n<p>             E<\/p>\n<p>             &#043;<\/p>\n<p>             10<\/p>\n<p>             \u00d7<\/p>\n<p>             N<\/p>\n<p>             &#043;<\/p>\n<p>        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-2em\"><\/span><span class=\"mord\"><span class=\"mtable\"><span class=\"col-align-r\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 2.5em\"><span class=\"\" style=\"top: -4.66em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mopen\">(<\/span><span class=\"mord\">1000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">100<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">E<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">10<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">N<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">D<\/span><\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">100<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">O<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">10<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">R<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">E<\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><span class=\"\" style=\"top: -3.16em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">\u2212<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">10000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">1000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">O<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">100<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">N<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">10<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">E<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">Y<\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><span class=\"\" style=\"top: -1.66em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">1000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">91<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">E<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">10<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">R<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">D<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">9000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">900<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">O<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">90<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">N<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord text\"><span class=\"mord\">Y<\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 2em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"col-align-l\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1em\"><span class=\"\" style=\"top: -3.16em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\"><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mord\">0<\/span><\/span><\/span><span class=\"\" style=\"top: -1.66em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\"><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mord\">0<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 2em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p>\u56de\u6eaf\u65f6\u9996\u5148\u8003\u8651\u7cfb\u6570\u7edd\u5bf9\u503c\u6700\u5927\u7684\u5b57\u6bcd <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        M<\/p>\n<p>       \\\\text{M}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5bf9\u5e94\u7cfb\u6570 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u2212<\/p>\n<p>        9000<\/p>\n<p>       -9000<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">\u2212<\/span><span class=\"mord\">9000<\/span><\/span><\/span><\/span><\/span>\u3002\u5c1a\u672a\u904d\u5386\u7684\u6b63\u7cfb\u6570\u5b57\u6bcd\u7684\u7cfb\u6570\u52a0\u6743\u548c\u7684\u6700\u5927\u503c&#xff08;\u5bf9\u5e94\u6700\u5927\u7edd\u5bf9\u503c&#xff09;\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1000<\/p>\n<p>        \u00d7<\/p>\n<p>        9<\/p>\n<p>        &#043;<\/p>\n<p>        91<\/p>\n<p>        \u00d7<\/p>\n<p>        8<\/p>\n<p>        &#043;<\/p>\n<p>        10<\/p>\n<p>        \u00d7<\/p>\n<p>        7<\/p>\n<p>        &#043;<\/p>\n<p>        1<\/p>\n<p>        \u00d7<\/p>\n<p>        6<\/p>\n<p>        &#061;<\/p>\n<p>        9804<\/p>\n<p>       1000 \\\\times 9 &#043; 91 \\\\times 8 &#043; 10 \\\\times 7 &#043; 1 \\\\times 6 &#061; 9804<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">1000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">9<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">91<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">8<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">10<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">6<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">9804<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u56e0\u6b64 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        M<\/p>\n<p>       \\\\text{M}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><\/span><\/span><\/span><\/span> \u7684\u53d6\u503c\u4e0a\u754c\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u230a<\/p>\n<p>          9804<\/p>\n<p>          9000<\/p>\n<p>        \u230b<\/p>\n<p>        &#061;<\/p>\n<p>        1<\/p>\n<p>       \\\\Big\\\\lfloor \\\\dfrac{9804}{9000} \\\\Big\\\\rfloor &#061; 1<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 2.0074em;vertical-align: -0.686em\"><\/span><span class=\"mord\"><span class=\"delimsizing size2\">\u230a<\/span><\/span><span class=\"mord\"><span class=\"mopen nulldelimiter\"><\/span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.3214em\"><span class=\"\" style=\"top: -2.314em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">9000<\/span><\/span><\/span><span class=\"\" style=\"top: -3.23em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"frac-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><span class=\"\" style=\"top: -3.677em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">9804<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.686em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mclose nulldelimiter\"><\/span><\/span><span class=\"mord\"><span class=\"delimsizing size2\">\u230b<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002\u7531\u4e8e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        M<\/p>\n<p>       \\\\text{M}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><\/span><\/span><\/span><\/span> \u4f4d\u4e8e\u6700\u9ad8\u4f4d\u56e0\u6b64\u53d6\u503c\u4e0b\u754c\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1<\/p>\n<p>       1<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002\u56e0\u6b64 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        M<\/p>\n<p>       \\\\text{M}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><\/span><\/span><\/span><\/span> \u7684\u503c\u7b49\u4e8e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1<\/p>\n<p>       1<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<p>\u786e\u5b9a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        M<\/p>\n<p>        &#061;<\/p>\n<p>        1<\/p>\n<p>       \\\\text{M} &#061; 1<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span> \u4e4b\u540e&#xff0c;\u8003\u8651\u5269\u4f59\u5b57\u6bcd\u4e2d\u7cfb\u6570\u7edd\u5bf9\u503c\u6700\u5927\u7684\u5b57\u6bcd <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        S<\/p>\n<p>       \\\\text{S}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5bf9\u5e94\u7cfb\u6570 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1000<\/p>\n<p>       1000<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1000<\/span><\/span><\/span><\/span><\/span>\u3002\u5c1a\u672a\u904d\u5386\u7684\u8d1f\u7cfb\u6570\u5b57\u6bcd\u7684\u7cfb\u6570\u52a0\u6743\u548c\u7684\u6700\u5c0f\u503c&#xff08;\u5bf9\u5e94\u6700\u5927\u7edd\u5bf9\u503c&#xff09;\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        (<\/p>\n<p>        \u2212<\/p>\n<p>        900<\/p>\n<p>        )<\/p>\n<p>        \u00d7<\/p>\n<p>        9<\/p>\n<p>        &#043;<\/p>\n<p>        (<\/p>\n<p>        \u2212<\/p>\n<p>        90<\/p>\n<p>        )<\/p>\n<p>        \u00d7<\/p>\n<p>        8<\/p>\n<p>        &#043;<\/p>\n<p>        (<\/p>\n<p>        \u2212<\/p>\n<p>        1<\/p>\n<p>        )<\/p>\n<p>        \u00d7<\/p>\n<p>        7<\/p>\n<p>        &#061;<\/p>\n<p>        \u2212<\/p>\n<p>        8827<\/p>\n<p>       (-900) \\\\times 9 &#043; (-90) \\\\times 8 &#043; (-1) \\\\times 7 &#061; -8827<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">(<\/span><span class=\"mord\">\u2212<\/span><span class=\"mord\">900<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">9<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">(<\/span><span class=\"mord\">\u2212<\/span><span class=\"mord\">90<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">8<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">(<\/span><span class=\"mord\">\u2212<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">7<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">\u2212<\/span><span class=\"mord\">8827<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u8ba1\u7b97 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        S<\/p>\n<p>       \\\\text{S}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><\/span><\/span><\/span><\/span> \u7684\u53d6\u503c\u4e0a\u754c\u65f6\u9700\u8981\u8003\u8651\u5df2\u7ecf\u904d\u5386\u8fc7\u7684 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        M<\/p>\n<p>       \\\\text{M}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><\/span><\/span><\/span><\/span> \u7684\u53d6\u503c&#xff0c;\u56e0\u6b64 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        S<\/p>\n<p>       \\\\text{S}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><\/span><\/span><\/span><\/span> \u7684\u53d6\u503c\u4e0a\u754c\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        \u230a<\/p>\n<p>           9000<\/p>\n<p>           &#043;<\/p>\n<p>           8827<\/p>\n<p>          1000<\/p>\n<p>        \u230b<\/p>\n<p>        &#061;<\/p>\n<p>        17<\/p>\n<p>       \\\\Big\\\\lfloor \\\\dfrac{9000 &#043; 8827}{1000} \\\\Big\\\\rfloor &#061; 17<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 2.0074em;vertical-align: -0.686em\"><\/span><span class=\"mord\"><span class=\"delimsizing size2\">\u230a<\/span><\/span><span class=\"mord\"><span class=\"mopen nulldelimiter\"><\/span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 1.3214em\"><span class=\"\" style=\"top: -2.314em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">1000<\/span><\/span><\/span><span class=\"\" style=\"top: -3.23em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"frac-line\" style=\"border-bottom-width: 0.04em\"><\/span><\/span><span class=\"\" style=\"top: -3.677em\"><span class=\"pstrut\" style=\"height: 3em\"><\/span><span class=\"mord\"><span class=\"mord\">9000<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mord\">8827<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.686em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><span class=\"mclose nulldelimiter\"><\/span><\/span><span class=\"mord\"><span class=\"delimsizing size2\">\u230b<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">17<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u8be5\u4e0a\u754c\u5927\u4e8e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        9<\/p>\n<p>       9<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">9<\/span><\/span><\/span><\/span><\/span> \u56e0\u6b64 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        S<\/p>\n<p>       \\\\text{S}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><\/span><\/span><\/span><\/span> \u7684\u53d6\u503c\u4e0a\u754c\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        9<\/p>\n<p>       9<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">9<\/span><\/span><\/span><\/span><\/span>\u3002\u7531\u4e8e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        S<\/p>\n<p>       \\\\text{S}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><\/span><\/span><\/span><\/span> \u4f4d\u4e8e\u6700\u9ad8\u4f4d\u56e0\u6b64\u53d6\u503c\u4e0b\u754c\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1<\/p>\n<p>       1<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002\u56e0\u6b64 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        S<\/p>\n<p>       \\\\text{S}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><\/span><\/span><\/span><\/span> \u7684\u53d6\u503c\u8303\u56f4\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        [<\/p>\n<p>        1<\/p>\n<p>        ,<\/p>\n<p>        9<\/p>\n<p>        ]<\/p>\n<p>       [1, 9]<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">[<\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">9<\/span><span class=\"mclose\">]<\/span><\/span><\/span><\/span><\/span>\u3002\u7531\u4e8e\u5df2\u7ecf\u6709 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        M<\/p>\n<p>        &#061;<\/p>\n<p>        1<\/p>\n<p>       \\\\text{M} &#061; 1<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">M<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u4e3a\u4e86\u786e\u4fdd\u4e0d\u540c\u5b57\u6bcd\u7684\u53d6\u503c\u4e0d\u540c&#xff0c;\u540e\u7eed\u56de\u6eaf\u65f6\u4f1a\u8df3\u8fc7 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        S<\/p>\n<p>        &#061;<\/p>\n<p>        1<\/p>\n<p>       \\\\text{S} &#061; 1<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord text\"><span class=\"mord\">S<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span> \u7684\u60c5\u51b5\u3002<\/p>\n<p>\u5176\u4f59\u5b57\u6bcd\u7684\u56de\u6eaf\u505a\u6cd5\u76f8\u540c\u3002\u7531\u4e8e\u65b9\u7a0b\u5b58\u5728\u89e3 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        9567<\/p>\n<p>        &#043;<\/p>\n<p>        1085<\/p>\n<p>        &#061;<\/p>\n<p>        10652<\/p>\n<p>       9567 &#043; 1085 &#061; 10652<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7278em;vertical-align: -0.0833em\"><\/span><span class=\"mord\">9567<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1085<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">10652<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u56e0\u6b64\u8fd4\u56de <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        true<\/p>\n<p>       \\\\text{true}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6151em\"><\/span><span class=\"mord text\"><span class=\"mord\">true<\/span><\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<h3>\u4ee3\u7801<\/h3>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LetterCoefficient<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>letter <span class=\"token operator\">&#061;<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>coefficient <span class=\"token operator\">&#061;<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> leading <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> used <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> coefficients <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> positiveCount<span class=\"token punctuation\">,<\/span> negativeCount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">isSolvable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> words<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> result<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word <span class=\"token operator\">:<\/span> words<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entries <span class=\"token operator\">&#061;<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> entries<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>coefficient <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>coefficient <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveCount <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        negativeCount <span class=\"token operator\">&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>positiveList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>negativeList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> sign<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> wordLength <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>wordLength <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> wordLength <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">&#061;<\/span> sign<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">*&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOrDefault<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> unit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> total<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> positiveIndex<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> negativeIndex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount <span class=\"token operator\">&amp;&amp;<\/span> negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> total <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> positive<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>positiveIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>negativeIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> currList <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveList <span class=\"token operator\">:<\/span> negativeList<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveIndex <span class=\"token operator\">:<\/span> negativeIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> bounds <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeBounds <span class=\"token operator\">:<\/span> positiveBounds<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> boundIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeIndex <span class=\"token operator\">:<\/span> positiveIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> positiveIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> negativeIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> currList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>currIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currBound <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>bounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>boundIndex<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> total<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> minVal <span class=\"token operator\">&#061;<\/span> leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> maxVal <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>currBound <span class=\"token operator\">\/<\/span> coefficient<span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> minVal<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> maxVal<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">int<\/span> newTotal <span class=\"token operator\">&#061;<\/span> total <span class=\"token operator\">&#043;<\/span> coefficient <span class=\"token operator\">*<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>newTotal<span class=\"token punctuation\">,<\/span> positiveIndex <span class=\"token operator\">&#043;<\/span> positiveIncrease<span class=\"token punctuation\">,<\/span> negativeIndex <span class=\"token operator\">&#043;<\/span> negativeIncrease<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u590d\u6742\u5ea6\u5206\u6790<\/h3>\n<ul>\n<li>\n<p>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          L<\/p>\n<p>          &#043;<\/p>\n<p>          n<\/p>\n<p>          \u00d7<\/p>\n<p>           A<\/p>\n<p>           10<\/p>\n<p>           n<\/p>\n<p>          )<\/p>\n<p>         O(L &#043; n \\\\times A_{10}^n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">L<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6667em;vertical-align: -0.0833em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">A<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.6644em\"><span class=\"\" style=\"top: -2.4519em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">10<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">n<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2481em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5176\u4e2d <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          L<\/p>\n<p>         L<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord mathnormal\">L<\/span><\/span><\/span><\/span><\/span> \u662f\u65b9\u7a0b\u4e2d\u7684\u6240\u6709\u6570\u5b57\u957f\u5ea6\u4e4b\u548c&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          n<\/p>\n<p>         n<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span> \u662f\u65b9\u7a0b\u4e2d\u7684\u4e0d\u540c\u5b57\u6bcd\u4e2a\u6570\u3002\u5408\u5e76\u540c\u7c7b\u9879\u9700\u8981 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          L<\/p>\n<p>          )<\/p>\n<p>         O(L)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">L<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span> \u7684\u65f6\u95f4&#xff0c;\u5408\u5e76\u540c\u7c7b\u9879\u4e4b\u540e&#xff0c;\u6240\u6709\u5b57\u6bcd\u7684\u53d6\u503c\u6709 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>           A<\/p>\n<p>           10<\/p>\n<p>           n<\/p>\n<p>         A_{10}^n<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.9314em;vertical-align: -0.2481em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">A<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.6644em\"><span class=\"\" style=\"top: -2.4519em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">10<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">n<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2481em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u79cd&#xff0c;\u5bf9\u4e8e\u6bcf\u79cd\u53d6\u503c\u9700\u8981 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span> \u7684\u65f6\u95f4\u5224\u65ad\u662f\u5426\u4e3a\u65b9\u7a0b\u7684\u89e3&#xff0c;\u56e0\u6b64\u65f6\u95f4\u590d\u6742\u5ea6\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          L<\/p>\n<p>          &#043;<\/p>\n<p>          n<\/p>\n<p>          \u00d7<\/p>\n<p>           A<\/p>\n<p>           10<\/p>\n<p>           n<\/p>\n<p>          )<\/p>\n<p>         O(L &#043; n \\\\times A_{10}^n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">L<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6667em;vertical-align: -0.0833em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">A<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.6644em\"><span class=\"\" style=\"top: -2.4519em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">10<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">n<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2481em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<\/li>\n<li>\n<p>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5176\u4e2d <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          n<\/p>\n<p>         n<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span> \u662f\u65b9\u7a0b\u4e2d\u7684\u4e0d\u540c\u5b57\u6bcd\u4e2a\u6570\u3002\u56de\u6eaf\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u7684\u7a7a\u95f4\u548c\u9012\u5f52\u8c03\u7528\u6808\u9700\u8981 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span> \u7684\u7a7a\u95f4\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>\u62d3\u5c55\u95ee\u9898<\/h2>\n<h3>\u9898\u76ee\u63cf\u8ff0<\/h3>\n<p>\u539f\u59cb\u95ee\u9898\u4e2d\u7684\u6570\u5b57\u5168\u90e8\u7531\u5b57\u6bcd\u7ec4\u6210&#xff0c;\u53ea\u6709\u5224\u65ad\u65b9\u7a0b\u662f\u5426\u53ef\u89e3&#xff0c;\u5728\u539f\u59cb\u95ee\u9898\u7684\u57fa\u7840\u4e0a&#xff0c;\u53ef\u4ee5\u63d0\u51fa\u4e24\u4e2a\u62d3\u5c55\u95ee\u9898\u3002<\/p>\n<li>\n<p>\u5982\u679c\u65b9\u7a0b\u4e2d\u6709\u5df2\u77e5\u7684\u6570\u5b57&#xff0c;\u5982\u4f55\u5224\u65ad\u65b9\u7a0b\u662f\u5426\u53ef\u89e3&#xff1f;<\/p>\n<\/li>\n<li>\n<p>\u65b9\u7a0b\u7684\u89e3\u662f\u4ec0\u4e48&#xff1f;\u5982\u679c\u6709\u591a\u79cd\u89e3&#xff0c;\u8fd4\u56de\u5176\u4e2d\u4efb\u610f\u4e00\u79cd\u3002\u5982\u679c\u65b9\u7a0b\u4e0d\u53ef\u89e3&#xff0c;\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u3002<\/p>\n<\/li>\n<h3>\u89e3\u6cd5\u5206\u6790<\/h3>\n<p>\u7b2c 1 \u4e2a\u62d3\u5c55\u95ee\u9898&#xff0c;\u65b9\u7a0b\u4e2d\u5b58\u5728\u5e38\u6570\u9879&#xff0c;\u5728\u5408\u5e76\u540c\u7c7b\u9879\u7684\u65f6\u5019\u8ba1\u7b97\u5e38\u6570\u9879&#xff0c;\u56de\u6eaf\u65f6\u6709\u4e00\u4e2a\u521d\u59cb\u7684\u5e38\u6570\u9879&#xff0c;\u505a\u6cd5\u548c\u539f\u59cb\u95ee\u9898\u76f8\u540c\u3002<\/p>\n<p>\u7b2c 2 \u4e2a\u62d3\u5c55\u95ee\u9898&#xff0c;\u4e3a\u4e86\u5f97\u5230\u65b9\u7a0b\u7684\u89e3&#xff0c;\u9700\u8981\u4f7f\u7528\u54c8\u5e0c\u8868\u8bb0\u5f55\u6bcf\u4e2a\u5b57\u6bcd\u7684\u53d6\u503c\u3002\u56de\u6eaf\u8fc7\u7a0b\u4e2d&#xff0c;\u5bf9\u4e8e\u5f53\u524d\u5b57\u6bcd\u7684\u6bcf\u4e2a\u53d6\u503c&#xff0c;\u5c06\u5176\u5b58\u5165\u54c8\u5e0c\u8868&#xff0c;\u7136\u540e\u7ee7\u7eed\u56de\u6eaf\u3002\u5982\u679c\u5b58\u5728\u5b57\u6bcd\u7684\u53d6\u503c\u6ee1\u8db3\u65b9\u7a0b&#xff0c;\u5219\u6839\u636e\u6bcf\u4e2a\u5b57\u6bcd\u7684\u53d6\u503c\u751f\u6210\u65b9\u7a0b\u7684\u89e3\u3002<\/p>\n<p>\u4e3a\u4e86\u786e\u4fdd\u6bcf\u4e2a\u5b57\u6bcd\u90fd\u6709\u53d6\u503c&#xff0c;\u7cfb\u6570\u4e3a\u96f6\u7684\u5b57\u6bcd\u4e0d\u53ef\u4ee5\u5ffd\u7565&#xff0c;\u53ef\u4ee5\u5c06\u7cfb\u6570\u4e3a\u96f6\u7684\u5b57\u6bcd\u4e0e\u7cfb\u6570\u4e3a\u6b63\u7684\u5b57\u6bcd\u5206\u5728\u540c\u4e00\u7ec4&#xff0c;\u5373\u6240\u6709\u7684\u5b57\u6bcd\u5206\u6210\u7cfb\u6570\u4e3a\u975e\u8d1f\u6570\u548c\u7cfb\u6570\u4e3a\u8d1f\u6570\u4e24\u7ec4\u3002<\/p>\n<p>\u5982\u679c\u65b9\u7a0b\u4e2d\u6709\u5df2\u77e5\u7684\u6570\u5b57&#xff0c;\u5728\u751f\u6210\u65b9\u7a0b\u7684\u89e3\u65f6&#xff0c;\u5bf9\u4e8e\u5df2\u77e5\u7684\u6570\u5b57\u76f4\u63a5\u8f93\u51fa\u5373\u53ef\u3002<\/p>\n<h3>\u4ee3\u7801<\/h3>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u662f\u7b2c 1 \u4e2a\u62d3\u5c55\u95ee\u9898\u7684\u5b9e\u73b0\u3002<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LetterCoefficient<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>letter <span class=\"token operator\">&#061;<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>coefficient <span class=\"token operator\">&#061;<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> leading <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> used <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> constantSum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> coefficients <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> positiveCount<span class=\"token punctuation\">,<\/span> negativeCount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">isSolvable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> words<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> result<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word <span class=\"token operator\">:<\/span> words<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entries <span class=\"token operator\">&#061;<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> entries<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>coefficient <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>coefficient <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveCount <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        negativeCount <span class=\"token operator\">&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>positiveList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>negativeList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>constantSum<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> sign<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> wordLength <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>wordLength <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> wordLength <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">&#061;<\/span> sign<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">*&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">isDigit<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                constantSum <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;0&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> unit<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOrDefault<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> unit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> total<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> positiveIndex<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> negativeIndex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount <span class=\"token operator\">&amp;&amp;<\/span> negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> total <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> positive<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>positiveIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>negativeIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> currList <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveList <span class=\"token operator\">:<\/span> negativeList<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveIndex <span class=\"token operator\">:<\/span> negativeIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> bounds <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeBounds <span class=\"token operator\">:<\/span> positiveBounds<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> boundIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeIndex <span class=\"token operator\">:<\/span> positiveIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> positiveIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> negativeIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> currList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>currIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currBound <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>bounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>boundIndex<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> total<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> minVal <span class=\"token operator\">&#061;<\/span> leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> maxVal <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>currBound <span class=\"token operator\">\/<\/span> coefficient<span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> minVal<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> maxVal<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">int<\/span> newTotal <span class=\"token operator\">&#061;<\/span> total <span class=\"token operator\">&#043;<\/span> coefficient <span class=\"token operator\">*<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>newTotal<span class=\"token punctuation\">,<\/span> positiveIndex <span class=\"token operator\">&#043;<\/span> positiveIncrease<span class=\"token punctuation\">,<\/span> negativeIndex <span class=\"token operator\">&#043;<\/span> negativeIncrease<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u662f\u65b9\u7a0b\u4e2d\u5168\u90e8\u662f\u5b57\u6bcd\u7684\u60c5\u51b5\u7684\u7b2c 2 \u4e2a\u62d3\u5c55\u95ee\u9898\u7684\u5b9e\u73b0\u3002\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32&#xff0c;\u8868\u793a\u65b9\u7a0b\u7684\u89e3\u7684\u52a0\u6cd5\u5f62\u5f0f\u3002<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LetterCoefficient<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>letter <span class=\"token operator\">&#061;<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>coefficient <span class=\"token operator\">&#061;<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token class-name\">String<\/span> equationSolution <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> words<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> leading <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> used <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> coefficients <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> letterDigits <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> positiveCount<span class=\"token punctuation\">,<\/span> negativeCount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">isSolvable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> words<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> result<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>words <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>result <span class=\"token operator\">&#061;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word <span class=\"token operator\">:<\/span> words<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entries <span class=\"token operator\">&#061;<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> entries<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>coefficient <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveCount <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        negativeCount <span class=\"token operator\">&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>positiveList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>negativeList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> equationSolution<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> sign<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> wordLength <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>wordLength <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> wordLength <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">&#061;<\/span> sign<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">*&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOrDefault<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> unit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> total<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> positiveIndex<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> negativeIndex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount <span class=\"token operator\">&amp;&amp;<\/span> negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">boolean<\/span> flag <span class=\"token operator\">&#061;<\/span> total <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flag<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                equationSolution <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">generateEquationSolution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> flag<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> positive<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>positiveIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>negativeIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> currList <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveList <span class=\"token operator\">:<\/span> negativeList<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveIndex <span class=\"token operator\">:<\/span> negativeIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> bounds <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeBounds <span class=\"token operator\">:<\/span> positiveBounds<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> boundIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeIndex <span class=\"token operator\">:<\/span> positiveIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> positiveIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> negativeIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> currList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>currIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currBound <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>bounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>boundIndex<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> total<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> minVal <span class=\"token operator\">&#061;<\/span> leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> maxVal <span class=\"token operator\">&#061;<\/span> coefficient <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>currBound <span class=\"token operator\">\/<\/span> coefficient<span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> minVal<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> maxVal<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">int<\/span> newTotal <span class=\"token operator\">&#061;<\/span> total <span class=\"token operator\">&#043;<\/span> coefficient <span class=\"token operator\">*<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>newTotal<span class=\"token punctuation\">,<\/span> positiveIndex <span class=\"token operator\">&#043;<\/span> positiveIncrease<span class=\"token punctuation\">,<\/span> negativeIndex <span class=\"token operator\">&#043;<\/span> negativeIncrease<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">generateEquationSolution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">StringBuffer<\/span> sb <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StringBuffer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word <span class=\"token operator\">:<\/span> words<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; &#043; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> wordLength <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> wordLength<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; &#061; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> resultLength <span class=\"token operator\">&#061;<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> resultLength<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u662f\u65b9\u7a0b\u4e2d\u6709\u5df2\u77e5\u7684\u6570\u5b57\u7684\u60c5\u51b5\u7684\u7b2c 2 \u4e2a\u62d3\u5c55\u95ee\u9898\u7684\u5b9e\u73b0\u3002\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32&#xff0c;\u8868\u793a\u65b9\u7a0b\u7684\u89e3\u7684\u52a0\u6cd5\u5f62\u5f0f\u3002<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LetterCoefficient<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> letter<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> coefficient<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>letter <span class=\"token operator\">&#061;<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>coefficient <span class=\"token operator\">&#061;<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> letter<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> coefficient<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token class-name\">String<\/span> equationSolution <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> words<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> leading <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> used <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">boolean<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> constantSum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> coefficients <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> letterDigits <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> positiveCount<span class=\"token punctuation\">,<\/span> negativeCount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> positiveBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> negativeBounds <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">isSolvable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> words<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> result<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>words <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>result <span class=\"token operator\">&#061;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word <span class=\"token operator\">:<\/span> words<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entries <span class=\"token operator\">&#061;<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> entries<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>coefficient <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>lc<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveCount <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        negativeCount <span class=\"token operator\">&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>positiveList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>negativeList<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> positiveCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        positiveBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> bound <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">,<\/span> val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> negativeCount<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">,<\/span> val<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                bound <span class=\"token operator\">&#043;&#061;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>bound<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        negativeBounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>constantSum<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> equationSolution<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleNum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> sign<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> wordLength <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>wordLength <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> wordLength <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">&#061;<\/span> sign<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">,<\/span> unit <span class=\"token operator\">*&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">isDigit<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                constantSum <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;0&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> unit<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> coefficients<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOrDefault<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> unit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> total<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> positiveIndex<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> negativeIndex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount <span class=\"token operator\">&amp;&amp;<\/span> negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">boolean<\/span> flag <span class=\"token operator\">&#061;<\/span> total <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flag<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                equationSolution <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">generateEquationSolution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> flag<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> positive<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>negativeIndex <span class=\"token operator\">&#061;&#061;<\/span> negativeCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>positiveIndex <span class=\"token operator\">&#061;&#061;<\/span> positiveCount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>total <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            positive <span class=\"token operator\">&#061;<\/span> positiveList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>positiveIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> negativeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>negativeIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LetterCoefficient<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> currList <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveList <span class=\"token operator\">:<\/span> negativeList<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> positiveIndex <span class=\"token operator\">:<\/span> negativeIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> bounds <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeBounds <span class=\"token operator\">:<\/span> positiveBounds<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> boundIndex <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> negativeIndex <span class=\"token operator\">:<\/span> positiveIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> positiveIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> negativeIncrease <span class=\"token operator\">&#061;<\/span> positive <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">LetterCoefficient<\/span> lc <span class=\"token operator\">&#061;<\/span> currList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>currIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLetter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> coefficient <span class=\"token operator\">&#061;<\/span> lc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoefficient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> currBound <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>bounds<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>boundIndex<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> total<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> minVal <span class=\"token operator\">&#061;<\/span> leading<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> maxVal <span class=\"token operator\">&#061;<\/span> coefficient <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>currBound <span class=\"token operator\">\/<\/span> coefficient<span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> minVal<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> maxVal<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">int<\/span> newTotal <span class=\"token operator\">&#061;<\/span> total <span class=\"token operator\">&#043;<\/span> coefficient <span class=\"token operator\">*<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>newTotal<span class=\"token punctuation\">,<\/span> positiveIndex <span class=\"token operator\">&#043;<\/span> positiveIncrease<span class=\"token punctuation\">,<\/span> negativeIndex <span class=\"token operator\">&#043;<\/span> negativeIncrease<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                used<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">generateEquationSolution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">StringBuffer<\/span> sb <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StringBuffer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> word <span class=\"token operator\">:<\/span> words<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; &#043; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> wordLength <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> wordLength<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">isDigit<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; &#061; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> resultLength <span class=\"token operator\">&#061;<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> resultLength<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">isDigit<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">char<\/span> letter <span class=\"token operator\">&#061;<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>letterDigits<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>letter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u590d\u6742\u5ea6\u5206\u6790<\/h3>\n<ul>\n<li>\n<p>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          L<\/p>\n<p>          &#043;<\/p>\n<p>          n<\/p>\n<p>          \u00d7<\/p>\n<p>           A<\/p>\n<p>           10<\/p>\n<p>           n<\/p>\n<p>          )<\/p>\n<p>         O(L &#043; n \\\\times A_{10}^n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">L<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6667em;vertical-align: -0.0833em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\"><span class=\"mord mathnormal\">A<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.6644em\"><span class=\"\" style=\"top: -2.4519em;margin-left: 0em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">10<\/span><\/span><\/span><\/span><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mathnormal mtight\">n<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.2481em\"><span class=\"\"><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5176\u4e2d <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          L<\/p>\n<p>         L<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord mathnormal\">L<\/span><\/span><\/span><\/span><\/span> \u662f\u65b9\u7a0b\u4e2d\u7684\u6240\u6709\u6570\u5b57\u957f\u5ea6\u4e4b\u548c&#xff0c;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          n<\/p>\n<p>         n<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span> \u662f\u65b9\u7a0b\u4e2d\u7684\u4e0d\u540c\u5b57\u6bcd\u4e2a\u6570\u3002\u56de\u6eaf\u8fc7\u7a0b\u4e2d\u6bcf\u6b21\u66f4\u65b0\u53d6\u503c\u54c8\u5e0c\u8868\u7684\u65f6\u95f4\u662f <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>         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