{"id":106894,"date":"2026-09-18T14:24:32","date_gmt":"2026-09-18T06:24:32","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/106894.html"},"modified":"2026-09-18T14:24:32","modified_gmt":"2026-09-18T06:24:32","slug":"day12-leetcode-129%ef%bd%9c%e6%b1%82%e6%a0%b9%e8%8a%82%e7%82%b9%e5%88%b0%e5%8f%b6%e8%8a%82%e7%82%b9%e6%95%b0%e5%ad%97%e4%b9%8b%e5%92%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/106894.html","title":{"rendered":"DAY12: LeetCode 129\uff5c\u6c42\u6839\u8282\u70b9\u5230\u53f6\u8282\u70b9\u6570\u5b57\u4e4b\u548c"},"content":{"rendered":"<h2>LeetCode 129&#xff5c;\u6c42\u6839\u8282\u70b9\u5230\u53f6\u8282\u70b9\u6570\u5b57\u4e4b\u548c<\/h2>\n<h2>\u4e00\u3001\u9898\u76ee\u8981\u505a\u4ec0\u4e48?<\/h2>\n<p>\u5047\u8bbe\u6709\u8fd9\u6837\u4e00\u68f5\u6811&#xff1a;<\/p>\n<p>        4<br \/>\n       \/ \\\\<br \/>\n      9   0<br \/>\n     \/ \\\\<br \/>\n    5   1<\/p>\n<p>\u8fd9\u91cc\u7684\u53f6\u5b50\u8282\u70b9\u662f&#xff1a;5\u30011\u30010<\/p>\n<p>\u6240\u8c13\u53f6\u5b50\u8282\u70b9&#xff0c;\u5c31\u662f&#xff1a;<\/p>\n<p>\u5de6\u5b69\u5b50\u548c\u53f3\u5b69\u5b50\u90fd\u4e0d\u5b58\u5728\u7684\u8282\u70b9\u3002<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<ul>\n<li>\u53ea\u6709\u5de6\u5b69\u5b50\u4e3a\u7a7a&#xff0c;\u4e0d\u4e00\u5b9a\u662f\u53f6\u5b50&#xff1b;<\/li>\n<li>\u53ea\u6709\u53f3\u5b69\u5b50\u4e3a\u7a7a&#xff0c;\u4e5f\u4e0d\u4e00\u5b9a\u662f\u53f6\u5b50&#xff1b;<\/li>\n<li>\u5fc5\u987b\u5de6\u53f3\u5b69\u5b50\u90fd\u4e3a\u7a7a&#xff0c;\u624d\u662f\u53f6\u5b50\u3002<\/li>\n<\/ul>\n<p>\u9898\u76ee\u8981\u6c42\u6211\u4eec\u4ece\u6839\u8282\u70b9\u5f00\u59cb&#xff0c;\u4e00\u76f4\u8d70\u5230\u53f6\u5b50\u8282\u70b9\u3002<\/p>\n<p>\u4e8e\u662f\u8fd9\u91cc\u4e00\u5171\u6709\u4e09\u6761\u5b8c\u6574\u8def\u5f84&#xff1a;<\/p>\n<p>4 \u2192 9 \u2192 5<\/p>\n<p>4 \u2192 9 \u2192 1<\/p>\n<p>4 \u2192 0<\/p>\n<p>\u628a\u7ecf\u8fc7\u7684\u6570\u5b57\u8fde\u8d77\u6765&#xff0c;\u5c31\u5f97\u5230&#xff1a;<\/p>\n<p>495<\/p>\n<p>491<\/p>\n<p>40<\/p>\n<p>\u6700\u7ec8&#xff1a;495 &#043; 491 &#043; 40 &#061; 1026<\/p>\n<p>\u6240\u4ee5\u8fd9\u9053\u9898\u5b9e\u9645\u4e0a\u9700\u8981\u89e3\u51b3\u4e24\u4e2a\u95ee\u9898&#xff1a;<\/p>\n<li>\u600e\u4e48\u5728\u5f80\u4e0b\u8d70\u7684\u65f6\u5019&#xff0c;\u628a\u7ecf\u8fc7\u7684\u6570\u5b57\u9010\u6e10\u7ec4\u6210\u4e00\u4e2a\u5b8c\u6574\u6570\u5b57&#xff1f;<\/li>\n<li>\u600e\u4e48\u627e\u5230\u6811\u91cc\u9762\u6240\u6709\u201c\u6839\u8282\u70b9 \u2192 \u53f6\u5b50\u8282\u70b9\u201d\u7684\u8def\u5f84&#xff1f;<\/li>\n<hr \/>\n<h2>\u4e8c\u3001\u5148\u628a\u95ee\u9898\u7f29\u5c0f&#xff1a;\u5982\u679c\u53ea\u6709\u4e00\u6761\u8def\u600e\u4e48\u529e&#xff1f;<\/h2>\n<p>\u5148\u5047\u8bbe\u6811\u6839\u672c\u4e0d\u4f1a\u5206\u53c9&#xff0c;\u53ea\u6709&#xff1a;4 \u2192 9 \u2192 5<\/p>\n<p>\u90a3\u4e8b\u60c5\u5c31\u5f88\u7b80\u5355 :<br \/>\n\u521d\u59cb&#xff1a;current_num &#061; 0<\/p>\n<ul>\n<li>\u6765\u5230 4&#xff1a;4<\/li>\n<li>\u6765\u5230 9&#xff1a;4 \u00d7 10 &#043; 9 &#061; 49<\/li>\n<li>\u6765\u5230 5&#xff1a;49 \u00d7 10 &#043; 5 &#061; 495<\/li>\n<\/ul>\n<p>\u6240\u4ee5\u6211\u4eec\u4f1a\u53d1\u73b0\u4e00\u4e2a\u89c4\u5f8b\u3002<\/p>\n<p>\u6bcf\u6765\u5230\u4e00\u4e2a\u65b0\u7684\u8282\u70b9&#xff0c;\u53ea\u9700\u8981&#xff1a;\u4e4b\u524d\u7684\u6570\u5b57 \u00d7 10 &#043; \u5f53\u524d\u8282\u70b9\u7684\u503c<\/p>\n<p>\u4e5f\u5c31\u662f&#xff1a;<\/p>\n<p>current_num <span class=\"token operator\">&#061;<\/span> current_num <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> node<span class=\"token punctuation\">.<\/span>val<\/p>\n<p>\u6240\u4ee5&#xff0c;\u5982\u679c\u6211\u4eec\u6cbf\u7740\u4e00\u6761\u8def\u5f84\u5f80\u4e0b\u8d70&#xff0c;\u5c31\u53ea\u9700\u8981\u8bb0\u4f4f\u4e00\u4e2a\u4e1c\u897f&#xff1a;<\/p>\n<p>\u5230\u76ee\u524d\u4e3a\u6b62&#xff0c;\u8fd9\u6761\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u4e86\u4ec0\u4e48\u6570\u5b57&#xff1f;<\/p>\n<hr \/>\n<h2>\u4e09\u3001\u771f\u6b63\u9ebb\u70e6\u7684\u5730\u65b9&#xff1a;\u6811\u4f1a\u5206\u53c9<\/h2>\n<p>\u73b0\u5b9e\u4e2d\u7684\u6811\u4e0d\u662f&#xff1a;4 \u2192 9 \u2192 5 \u8fd9\u4e48\u7b80\u5355\u3002<\/p>\n<p>\u800c\u662f&#xff1a;<\/p>\n<p>        4<br \/>\n       \/ \\\\<br \/>\n      9   0<br \/>\n     \/ \\\\<br \/>\n    5   1<\/p>\n<ul>\n<li>\n<p>\u6765\u5230 4 \u4ee5\u540e&#xff0c;\u6709\u4e24\u4e2a\u65b9\u5411&#xff1a;<\/p>\n<ul>\n<li>\u5de6\u8fb9\u53bb 9\u3002<\/li>\n<li>\u53f3\u8fb9\u53bb 0\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6765\u5230 9 \u4ee5\u540e&#xff0c;\u53c8\u51fa\u73b0\u4e24\u4e2a\u65b9\u5411&#xff1a;<\/p>\n<ul>\n<li>\u5de6\u8fb9\u53bb 5\u3002<\/li>\n<li>\u53f3\u8fb9\u53bb 1\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4e0d\u65ad\u505a\u8fd9\u6837\u4e00\u4ef6\u4e8b\u60c5&#xff1a;<\/p>\n<p>\u6765\u5230\u4e00\u4e2a\u8282\u70b9<br \/>\n\u2193<br \/>\n\u5904\u7406\u5f53\u524d\u8282\u70b9<br \/>\n\u2193<br \/>\n\u770b\u770b\u4e0b\u9762\u8fd8\u6709\u6ca1\u6709\u8282\u70b9<br \/>\n\u2193<br \/>\n\u5982\u679c\u8fd8\u6709&#xff0c;\u5c31\u7ee7\u7eed\u5904\u7406\u5b83\u7684\u5b69\u5b50<\/p>\n<p>&#x1f516; \u4f46\u91cd\u70b9\u6765\u4e86&#xff1a;<\/p>\n<ul>\n<li>\u6765\u5230 4&#xff0c;\u9700\u8981\u505a\u8fd9\u4e9b\u4e8b\u60c5\u3002<\/li>\n<li>\u6765\u5230 9&#xff0c;\u4e5f\u9700\u8981\u505a\u8fd9\u4e9b\u4e8b\u60c5\u3002<\/li>\n<li>\u6765\u5230 5\u30011\u30010&#xff0c;\u4e5f\u90fd\u662f\u9762\u5bf9\u540c\u6837\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u4e5f\u5c31\u662f\u8bf4&#xff1a;<\/p>\n<p>\u201c\u5904\u7406\u5f53\u524d\u8fd9\u68f5\u6811\u201d\u548c \u201c\u5904\u7406\u5b83\u7684\u5de6\u5b50\u6811\u3001\u53f3\u5b50\u6811\u201d \u672c\u8d28\u4e0a\u662f\u540c\u4e00\u79cd\u95ee\u9898\u3002<\/p>\n<p>\u8fd9\u65f6\u5019\u4f7f\u7528 \u9012\u5f52 \u5c31\u5f88\u81ea\u7136\u4e86\u3002<\/p>\n<p>\u56e0\u4e3a\u9012\u5f52\u7279\u522b\u9002\u5408\u5904\u7406\u8fd9\u79cd&#xff1a;<\/p>\n<p>\u5927\u95ee\u9898\u91cc\u9762\u5305\u542b\u7ed3\u6784\u5b8c\u5168\u76f8\u540c\u7684\u5c0f\u95ee\u9898\u3002<\/p>\n<p>\u5f53\u7136&#xff0c;\u8fd9\u9053\u9898\u5e76\u4e0d\u662f\u53ea\u80fd\u9012\u5f52\u3002<\/p>\n<p>\u4e5f\u53ef\u4ee5\u81ea\u5df1\u7ef4\u62a4\u4e00\u4e2a\u6808&#xff0c;\u7528\u8fed\u4ee3 DFS \u5b8c\u6210\u3002<\/p>\n<p>\u4f46\u8fd9\u4e00\u7bc7\u5148\u53ea\u8ba8\u8bba\u9012\u5f52&#xff0c;\u56e0\u4e3a\u9012\u5f52\u6700\u5bb9\u6613\u770b\u6e05\u695a\u6811\u7684\u7ed3\u6784\u3002<\/p>\n<hr \/>\n<h2>\u56db\u3001\u6784\u5efa\u9012\u5f52\u51fd\u6570<\/h2>\n<p>\u524d\u9762\u6211\u4eec\u5df2\u7ecf\u77e5\u9053&#xff1a;<\/p>\n<p>\u8fd9\u9053\u9898\u9700\u8981\u4e0d\u65ad\u5904\u7406\u5f53\u524d\u8282\u70b9&#xff0c;\u7136\u540e\u7ee7\u7eed\u5904\u7406\u5b83\u7684\u5de6\u5b50\u6811\u548c\u53f3\u5b50\u6811\u3002<\/p>\n<p>\u6240\u4ee5\u63a5\u4e0b\u6765&#xff0c;\u6211\u4eec\u6b63\u5f0f\u5f00\u59cb\u6784\u5efa\u9012\u5f52\u51fd\u6570\u3002<\/p>\n<p>\u5199\u4e00\u4e2a\u9012\u5f52\u51fd\u6570\u65f6&#xff0c;\u53ef\u4ee5\u5148\u60f3\u51e0\u4e2a\u6700\u57fa\u672c\u7684\u95ee\u9898&#xff1a;<\/p>\n<li>\u8fd9\u4e2a\u51fd\u6570\u9700\u8981\u54ea\u4e9b\u53c2\u6570&#xff1f;<\/li>\n<li>\u6bcf\u8fdb\u5165\u4e00\u5c42\u9012\u5f52&#xff0c;\u8981\u5148\u5904\u7406\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u4ec0\u4e48\u65f6\u5019\u505c\u6b62\u9012\u5f52&#xff1f;<\/li>\n<li>\u5982\u679c\u8fd8\u6ca1\u6709\u7ed3\u675f&#xff0c;\u8981\u600e\u4e48\u7ee7\u7eed\u9012\u5f52&#xff1f;<\/li>\n<li>\u5f53\u524d\u8fd9\u4e00\u5c42\u6700\u540e\u8981\u8fd4\u56de\u4ec0\u4e48&#xff1f;<\/li>\n<p>\u6211\u4eec\u5c31\u6309\u7167\u8fd9\u4e2a\u987a\u5e8f\u6765\u3002<\/p>\n<hr \/>\n<h3>1. \u9012\u5f52\u51fd\u6570\u9700\u8981\u54ea\u4e9b\u53c2\u6570&#xff1f;<\/h3>\n<p>\u9996\u5148&#xff0c;\u6211\u4eec\u80af\u5b9a\u9700\u8981\u77e5\u9053&#xff1a;<\/p>\n<p>\u5f53\u524d\u8d70\u5230\u4e86\u54ea\u4e2a\u8282\u70b9&#xff1f;<\/p>\n<p>\u6240\u4ee5\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f&#xff1a;node<\/p>\n<p>\u4f46\u53ea\u6709 node \u8fd8\u4e0d\u591f\u3002<\/p>\n<p>\u6bd4\u5982\u73b0\u5728\u5df2\u7ecf\u8d70\u5230\u4e86&#xff1a;<\/p>\n<p>4 \u2192 9<\/p>\n<p>\u6765\u5230\u8282\u70b9 9 \u65f6&#xff0c;\u6211\u4eec\u9700\u8981\u5f97\u5230&#xff1a;49<\/p>\n<p>\u4f46\u662f 9 \u81ea\u5df1\u53ea\u77e5\u9053&#xff1a;<\/p>\n<p>node<span class=\"token punctuation\">.<\/span>val <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><\/p>\n<p>\u5b83\u8fd8\u5fc5\u987b\u77e5\u9053&#xff1a;<\/p>\n<p>\u5728\u6765\u5230\u6211\u4e4b\u524d&#xff0c;\u8fd9\u6761\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u4e86\u6570\u5b57 4\u3002<\/p>\n<p>\u6240\u4ee5\u9012\u5f52\u51fd\u6570\u8fd8\u9700\u8981\u989d\u5916\u4fdd\u5b58&#xff1a;<\/p>\n<p>\u5f53\u524d\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u7684\u6570\u5b57\u3002<\/p>\n<p>\u6211\u4eec\u628a\u5b83\u53eb\u505a&#xff1a;current_num<\/p>\n<p>\u4e8e\u662f\u9012\u5f52\u51fd\u6570\u5c31\u53ef\u4ee5\u5b9a\u4e49\u6210&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5176\u4e2d&#xff1a;<\/p>\n<p>node<br \/>\n\u2192 \u5f53\u524d\u6b63\u5728\u5904\u7406\u7684\u8282\u70b9<\/p>\n<p>current_num<br \/>\n\u2192 \u6765\u5230\u5f53\u524d\u8282\u70b9\u4e4b\u524d&#xff0c;\u8fd9\u6761\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u7684\u6570\u5b57<\/p>\n<p>\u6700\u5f00\u59cb\u8fd8\u6ca1\u6709\u7ecf\u8fc7\u4efb\u4f55\u8282\u70b9&#xff0c;\u6240\u4ee5\u7b2c\u4e00\u6b21\u8c03\u7528&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>2. \u8fdb\u5165\u4e00\u5c42\u9012\u5f52\u540e&#xff0c;\u5148\u66f4\u65b0\u5f53\u524d\u8def\u5f84\u6570\u5b57<\/h3>\n<p>\u5047\u8bbe\u5f53\u524d\u8c03\u7528&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8868\u793a\u6765\u5230\u8282\u70b9 9 \u65f6&#xff0c;\u524d\u9762\u7684\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u6570\u5b57 4\u3002<\/p>\n<p>\u6839\u636e\u524d\u9762\u603b\u7ed3\u7684\u89c4\u5f8b&#xff1a;<\/p>\n<p>current_num <span class=\"token operator\">&#061;<\/span> current_num <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> node<span class=\"token punctuation\">.<\/span>val<\/p>\n<p>\u6240\u4ee5\u8fd9\u4e00\u5c42\u66f4\u65b0\u540e&#xff1a;<\/p>\n<p>4 \u00d7 10 &#043; 9 &#061; 49<\/p>\n<p>\u6b64\u65f6&#xff1a;<\/p>\n<p>current_num <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">49<\/span><\/p>\n<hr \/>\n<h3>3. \u4ec0\u4e48\u65f6\u5019\u505c\u6b62\u9012\u5f52&#xff1f;<\/h3>\n<p>\u63a5\u4e0b\u6765\u8981\u786e\u5b9a&#xff1a;<\/p>\n<p>\u9012\u5f52\u4ec0\u4e48\u65f6\u5019\u4e0d\u9700\u8981\u518d\u7ee7\u7eed\u5f80\u4e0b\u8d70&#xff1f;<\/p>\n<p>\u8fd9\u9053\u9898\u91cc\u6709\u4e24\u79cd\u60c5\u51b5&#xff1a;<\/p>\n<h4>\u53f6\u5b50\u8282\u70b9<\/h4>\n<p>\u9898\u76ee\u8981\u6c42\u7684\u662f&#xff1a;\u6839\u8282\u70b9 \u2192 \u53f6\u5b50\u8282\u70b9<\/p>\n<p>\u6240\u4ee5\u53ea\u6709\u8d70\u5230 \u53f6\u5b50\u8282\u70b9&#xff0c;\u624d\u8bf4\u660e\u4e00\u6761\u5b8c\u6574\u8def\u5f84\u771f\u6b63\u5f62\u6210 -&gt;&gt; \u5f53\u524d\u8fd9\u6761\u4ece\u6839\u8282\u70b9\u51fa\u53d1\u7684\u8def\u5f84\u5df2\u7ecf\u8d70\u5b8c\u4e86\u3002<\/p>\n<p>\u53f6\u5b50\u8282\u70b9\u6307\u7684\u662f&#xff1a; \u5de6\u5b69\u5b50\u548c\u53f3\u5b69\u5b50\u90fd\u4e0d\u5b58\u5728\u7684\u8282\u70b9\u3002<\/p>\n<p>\u56e0\u6b64\u9700\u8981\u540c\u65f6\u6ee1\u8db3&#xff1a;<\/p>\n<p>node<span class=\"token punctuation\">.<\/span>left <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span> <span class=\"token keyword\">and<\/span> node<span class=\"token punctuation\">.<\/span>right <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><\/p>\n<p>\u6ce8\u610f\u8fd9\u91cc\u662f and\u3002<\/p>\n<p>\u53ea\u6709\u5de6\u53f3\u4e24\u8fb9\u90fd\u4e3a\u7a7a&#xff0c;\u5f53\u524d\u8282\u70b9\u624d\u662f\u53f6\u5b50\u8282\u70b9\u3002<\/p>\n<hr \/>\n<h5>\u8d70\u5230\u53f6\u5b50\u4ee5\u540e\u8fd4\u56de\u4ec0\u4e48&#xff1f;<\/h5>\n<p>\u6bd4\u5982\u5f53\u524d\u8def\u5f84\u662f&#xff1a;<\/p>\n<p>4 \u2192 9 \u2192 5<\/p>\n<p>\u6765\u5230\u8282\u70b9 5 \u540e&#xff0c;\u6211\u4eec\u5df2\u7ecf\u8ba1\u7b97\u51fa&#xff1a;<\/p>\n<p>49 \u00d7 10 &#043; 5 &#061; 495<\/p>\n<p>\u800c\u8282\u70b9 5 \u6ca1\u6709\u5de6\u53f3\u5b69\u5b50&#xff0c;\u6240\u4ee5\u8fd9\u6761\u8def\u5f84\u5230\u8fd9\u91cc\u6b63\u5f0f\u7ed3\u675f\u3002<\/p>\n<p>\u6b64\u65f6&#xff1a;495  \u5c31\u662f \u8fd9\u4e00\u6761\u8def\u5f84\u6700\u7ec8\u7ec4\u6210\u7684\u6570\u5b57\u3002<\/p>\n<p>\u56e0\u6b64\u76f4\u63a5\u8fd4\u56de\u5f53\u524d\u7684 current_num&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> current_num<\/p>\n<p>\u4e00\u65e6\u6267\u884c return&#xff0c;\u5f53\u524d\u8fd9\u4e00\u5c42\u9012\u5f52\u5c31\u7ed3\u675f\u4e86&#xff0c;\u4e0d\u4f1a\u518d\u7ee7\u7eed\u5f80\u4e0b\u5bfb\u627e\u5b50\u8282\u70b9\u3002<\/p>\n<hr \/>\n<h4>\u7a7a\u8282\u70b9<\/h4>\n<p>\u53e6\u4e00\u79cd\u505c\u6b62\u9012\u5f52\u7684\u60c5\u51b5\u662f&#xff1a;<\/p>\n<p>\u5f53\u524d\u8fd9\u4e2a\u65b9\u5411\u6839\u672c\u6ca1\u6709\u8282\u70b9\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>    1<br \/>\n   \/<br \/>\n  2<br \/>\n   \\\\<br \/>\n    3<\/p>\n<p>\u8282\u70b9 2 \u4e0d\u662f\u53f6\u5b50&#xff0c;\u56e0\u4e3a\u5b83\u8fd8\u6709\u53f3\u5b69\u5b50 3\u3002<\/p>\n<p>\u6240\u4ee5\u540e\u9762\u4ecd\u7136\u9700\u8981\u7ee7\u7eed\u5904\u7406\u5b83\u7684\u5de6\u53f3\u4e24\u8fb9\u3002<\/p>\n<p>\u4f46\u662f\u5f80\u5de6\u8d70\u65f6\u4f1a\u53d1\u73b0&#xff1a;<\/p>\n<p>2 \u7684\u5de6\u8fb9\u662f\u7a7a\u7684<\/p>\n<p>\u65e2\u7136\u8fd9\u4e00\u8fb9\u5df2\u7ecf\u6ca1\u6709\u8282\u70b9&#xff0c;\u5c31\u6ca1\u6709\u5fc5\u8981\u7ee7\u7eed\u9012\u5f52\u4e86\u3002<\/p>\n<p>\u56e0\u6b64\u9047\u5230\u7a7a\u8282\u70b9\u65f6&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>\u4e3a\u4ec0\u4e48\u8fd4\u56de 0&#xff1f;<\/p>\n<p>\u56e0\u4e3a\u8fd9\u4e00\u8fb9\u6ca1\u6709\u5f62\u6210\u4efb\u4f55\u5b8c\u6574\u8def\u5f84&#xff0c;\u6240\u4ee5\u5bf9\u6700\u7ec8\u7ed3\u679c\u6ca1\u6709\u8d21\u732e\u3002<\/p>\n<p>\u540e\u9762\u6211\u4eec\u4f1a\u628a\u5de6\u53f3\u4e24\u8fb9\u5f97\u5230\u7684\u7ed3\u679c\u76f8\u52a0&#xff1a;<\/p>\n<p>\u5de6\u8fb9\u7ed3\u679c &#043; \u53f3\u8fb9\u7ed3\u679c<\/p>\n<p>\u5982\u679c\u5de6\u8fb9\u4e0d\u5b58\u5728&#xff0c;\u90a3\u4e48&#xff1a;<\/p>\n<p>0 &#043; \u53f3\u8fb9\u771f\u6b63\u7684\u7ed3\u679c<\/p>\n<p>\u4e0d\u4f1a\u5f71\u54cd\u53f3\u8fb9\u7684\u7b54\u6848\u3002<\/p>\n<hr \/>\n<h3>4. \u5982\u679c\u672a\u7ec8\u6b62&#xff0c;\u5c31\u7ee7\u7eed\u9012\u5f52\u5de6\u53f3\u5b50\u6811<\/h3>\n<p>\u5047\u8bbe\u73b0\u5728\u6765\u5230\u8282\u70b9 9&#xff1a;<\/p>\n<p>    9<br \/>\n   \/ \\\\<br \/>\n  5   1<\/p>\n<p>\u5f53\u524d\u5df2\u7ecf\u5f97\u5230&#xff1a;<\/p>\n<p>current_num <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">49<\/span><\/p>\n<p>\u4f46\u662f\u8282\u70b9 9 \u8fd8\u6709\u5b69\u5b50&#xff0c;\u6240\u4ee5\u8def\u5f84\u8fd8\u6ca1\u6709\u7ed3\u675f\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u5c31\u9700\u8981\u7ee7\u7eed\u5904\u7406\u5b83\u7684\u5de6\u5b50\u6811\u548c\u53f3\u5b50\u6811\u3002<\/p>\n<p>\u5de6\u8fb9&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4e5f\u5c31\u662f&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u53f3\u8fb9&#xff1a;<\/p>\n<p>num_right <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4e5f\u5c31\u662f&#xff1a;<\/p>\n<p>num_right <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>&#x1f6a9; \u6ce8\u610f\u8fd9\u91cc\u7684\u4ee3\u7801\u6267\u884c\u987a\u5e8f\u3002<\/p>\n<p>Python \u4f1a\u5148\u6267\u884c&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u53ea\u6709\u7b49\u8fd9\u4e2a\u51fd\u6570\u8c03\u7528\u7ed3\u675f\u5e76\u4e14\u5f97\u5230\u8fd4\u56de\u503c\u4ee5\u540e&#xff1a;num_left \u624d\u4f1a\u771f\u6b63\u62ff\u5230\u7ed3\u679c\u3002<\/p>\n<p>\u7136\u540e\u7a0b\u5e8f\u624d\u7ee7\u7eed\u6267\u884c&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>5. \u9012\u5f52\u51fd\u6570\u5230\u5e95\u8fd4\u56de\u4ec0\u4e48&#xff1f;<\/h3>\n<p>\u8fd9\u91cc\u662f\u8fd9\u9053\u9898\u6700\u91cd\u8981\u7684\u5730\u65b9\u4e4b\u4e00\u3002<\/p>\n<p>\u6211\u4eec\u9700\u8981\u5148\u660e\u786e&#xff1a;<\/p>\n<p>dfs(node, current_num) \u7684\u8fd4\u56de\u503c\u5230\u5e95\u4ee3\u8868\u4ec0\u4e48&#xff1f;<\/p>\n<p>\u53ef\u4ee5\u628a\u5b83\u5b9a\u4e49\u6210&#xff1a;<\/p>\n<p>\u4ece\u5f53\u524d\u8282\u70b9\u7ee7\u7eed\u5f80\u4e0b\u8d70&#xff0c;\u6240\u6709\u5b8c\u6574\u8def\u5f84\u6700\u7ec8\u7ec4\u6210\u7684\u6570\u5b57\u4e4b\u548c\u3002<\/p>\n<p>\u6bd4\u5982 \u8282\u70b9 5&#xff1a;<\/p>\n<p>4 \u2192 9 \u2192 5<\/p>\n<p>\u53ea\u6709\u8fd9\u4e00\u6761\u8def\u5f84\u3002<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd4\u56de&#xff1a;495<\/p>\n<p>\u8282\u70b9 1&#xff1a;<\/p>\n<p>4 \u2192 9 \u2192 1<\/p>\n<p>\u4e5f\u53ea\u6709\u8fd9\u4e00\u6761\u8def\u5f84\u3002<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd4\u56de&#xff1a;491<\/p>\n<p>\u4e8e\u662f\u56de\u5230\u8282\u70b9 9 \u4ee5\u540e&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">495<\/span><br \/>\nnum_right <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">491<\/span><\/p>\n<p>\u90a3\u4e48\u8282\u70b9 9 \u8fd9\u4e00\u6574\u68f5\u5b50\u6811\u4e0b\u9762&#xff0c;\u6240\u6709\u8def\u5f84\u7684\u603b\u548c \u5c31\u662f&#xff1a;<\/p>\n<p>495 &#043; 491 &#061; 986<\/p>\n<p>\u6240\u4ee5\u8282\u70b9 9 \u6700\u540e\u8fd4\u56de&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> num_left <span class=\"token operator\">&#043;<\/span> num_right<\/p>\n<p>\u4e5f\u5c31\u662f&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">986<\/span><\/p>\n<hr \/>\n<h4>return 495 \u4e3a\u4ec0\u4e48\u4f1a\u56de\u5230\u8282\u70b9 9&#xff1f;<\/h4>\n<p>\u56e0\u4e3a\u8282\u70b9 9 \u4e4b\u524d\u6267\u884c\u7684\u662f&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6267\u884c\u5230\u8fd9\u91cc\u65f6&#xff0c;\u8282\u70b9 9 \u8fd9\u4e00\u5c42\u7684\u51fd\u6570\u8c03\u7528\u4f1a\u6682\u65f6\u505c\u4e0b\u6765\u3002<\/p>\n<p>\u7a0b\u5e8f\u8fdb\u5165&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8282\u70b9 5 \u6700\u540e&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">495<\/span><\/p>\n<p>\u4e8e\u662f\u8fd9\u4e2a\u8fd4\u56de\u503c\u4f1a\u4ea4\u56de\u7ed9\u8c03\u7528\u5b83\u7684\u4f4d\u7f6e&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u56e0\u6b64&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">495<\/span><\/p>\n<p>\u7136\u540e\u8282\u70b9 9 \u8fd9\u4e00\u5c42\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u884c&#xff1a;<\/p>\n<p>num_right <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd9\u5c31\u662f\u9012\u5f52\u4e2d\u7684\u8c03\u7528\u6808&#xff1a;<\/p>\n<p>\u4e0a\u4e00\u5c42\u51fd\u6570\u8c03\u7528\u4e0b\u4e00\u5c42<br \/>\n\u2193<br \/>\n\u4e0a\u4e00\u5c42\u6682\u505c<\/p>\n<p>\u4e0b\u4e00\u5c42\u8ba1\u7b97\u5b8c\u6210<br \/>\n\u2193<br \/>\nreturn \u8fd4\u56de\u7ed3\u679c<\/p>\n<p>\u4e0a\u4e00\u5c42\u4ece\u521a\u624d\u6682\u505c\u7684\u4f4d\u7f6e\u7ee7\u7eed\u6267\u884c<\/p>\n<hr \/>\n<h2>\u4e94\u3001\u628a\u5b8c\u6574\u9012\u5f52\u8fc7\u7a0b\u8d70\u4e00\u904d<\/h2>\n<p>\u73b0\u5728\u518d\u628a\u6574\u68f5\u6811\u8dd1\u4e00\u6b21&#xff1a;<\/p>\n<p>        4<br \/>\n       \/ \\\\<br \/>\n      9   0<br \/>\n     \/ \\\\<br \/>\n    5   1<\/p>\n<p>&#x1f535; \u7b2c\u4e00\u6b21&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5148\u5904\u7406\u8282\u70b9 4&#xff1a;<\/p>\n<p>current_num &#061; 0 \u00d7 10 &#043; 4<br \/>\n            &#061; 4<\/p>\n<p>\u8282\u70b9 4 \u4e0d\u662f\u53f6\u5b50&#xff0c;\u6240\u4ee5\u7ee7\u7eed\u5904\u7406\u5de6\u5b50\u6811&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>&#x1f535; \u6765\u5230\u8282\u70b9 9&#xff1a;<\/p>\n<p>current_num &#061; 4 \u00d7 10 &#043; 9<br \/>\n            &#061; 49<\/p>\n<p>\u8282\u70b9 9 \u4e5f\u4e0d\u662f\u53f6\u5b50\u3002<\/p>\n<p>&#x1f7e2; \u5148\u5904\u7406\u5de6\u8fb9&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6765\u5230\u8282\u70b9 5&#xff1a;<\/p>\n<p>current_num &#061; 49 \u00d7 10 &#043; 5<br \/>\n            &#061; 495<\/p>\n<p>\u8282\u70b9 5 \u662f\u53f6\u5b50&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">495<\/span><\/p>\n<p>\u56de\u5230\u8282\u70b9 9&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">495<\/span><\/p>\n<p>&#x1f7e2; \u63a5\u4e0b\u6765\u5904\u7406\u53f3\u8fb9&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">49<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6765\u5230\u8282\u70b9 1&#xff1a;<\/p>\n<p>current_num &#061; 49 \u00d7 10 &#043; 1<br \/>\n            &#061; 491<\/p>\n<p>\u8282\u70b9 1 \u662f\u53f6\u5b50&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">491<\/span><\/p>\n<p>\u56de\u5230\u8282\u70b9 9&#xff1a;<\/p>\n<p>num_right <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">491<\/span><\/p>\n<p>\u4e8e\u662f\u8282\u70b9 9 \u6c47\u603b&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">495<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">491<\/span><\/p>\n<p>\u5f97\u5230&#xff1a;986<\/p>\n<p>&#x1f535; \u8fd9\u4e2a 986 \u518d\u8fd4\u56de\u8282\u70b9 4&#xff1a;<\/p>\n<p>num_left <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">986<\/span><\/p>\n<p>&#x1f7e2; \u63a5\u4e0b\u6765\u8282\u70b9 4 \u5904\u7406\u53f3\u8fb9&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6765\u5230\u8282\u70b9 0&#xff1a;<\/p>\n<p>current_num &#061; 4 \u00d7 10 &#043; 0<br \/>\n            &#061; 40<\/p>\n<p>\u8282\u70b9 0 \u662f\u53f6\u5b50&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">40<\/span><\/p>\n<p>\u56de\u5230\u8282\u70b9 4&#xff1a;<\/p>\n<p>num_right <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">40<\/span><\/p>\n<p>\u6700\u540e\u8282\u70b9 4 \u6c47\u603b&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">986<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">40<\/span><\/p>\n<p>\u6700\u7ec8\u5f97\u5230&#xff1a;<\/p>\n<p>1026<\/p>\n<hr \/>\n<h2>\u516d\u3001\u8fd9\u9053\u9898\u7684\u9012\u5f52\u5230\u5e95\u5728\u505a\u4ec0\u4e48&#xff1f;<\/h2>\n<p>\u73b0\u5728\u56de\u5934\u770b&#xff0c;\u4f1a\u53d1\u73b0\u8fd9\u4e2a\u9012\u5f52\u5176\u5b9e\u6709\u4e24\u4e2a\u65b9\u5411\u3002<\/p>\n<h4>\u5f80\u4e0b\u9012\u5f52\u65f6&#xff1a;\u6784\u9020\u5f53\u524d\u8def\u5f84<\/h4>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>4<br \/>\n\u2193<br \/>\n49<br \/>\n\u2193<br \/>\n495<\/p>\n<p>\u6211\u4eec\u4e0d\u65ad\u66f4\u65b0&#xff1a;<\/p>\n<p>current_num <span class=\"token operator\">&#061;<\/span> current_num <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> node<span class=\"token punctuation\">.<\/span>val<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p>\u8def\u5f84\u72b6\u6001\u5728\u4e0d\u65ad\u5f80\u4e0b\u4f20\u3002<\/p>\n<hr \/>\n<h4>\u5f80\u4e0a\u8fd4\u56de\u65f6&#xff1a;\u6c47\u603b\u5b50\u6811\u7b54\u6848<\/h4>\n<p>\u53f6\u5b50\u8282\u70b9\u5148\u8fd4\u56de&#xff1a;<\/p>\n<p>495<br \/>\n491<br \/>\n40<\/p>\n<p>\u7136\u540e&#xff1a;<\/p>\n<p>495 &#043; 491 &#061; 986<\/p>\n<p>\u6700\u540e&#xff1a;<\/p>\n<p>986 &#043; 40 &#061; 1026<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p>\u5b50\u6811\u7b54\u6848\u5728\u4e0d\u65ad\u5f80\u4e0a\u6536\u3002<\/p>\n<p>\u53ef\u4ee5\u628a\u8fd9\u9053\u9898\u6700\u6838\u5fc3\u7684\u9012\u5f52\u8fc7\u7a0b\u8bb0\u6210\u4e00\u53e5\u8bdd&#xff1a;<\/p>\n<p>\u72b6\u6001\u5f80\u4e0b\u4f20&#xff0c;\u7b54\u6848\u5f80\u4e0a\u6536\u3002<\/p>\n<hr \/>\n<h2>\u4e03\u3001\u5b8c\u6574\u4ee3\u7801<\/h2>\n<p>\u7b49\u524d\u9762\u7684\u9012\u5f52\u8fc7\u7a0b\u60f3\u660e\u767d\u4ee5\u540e&#xff0c;\u518d\u6765\u770b\u4ee3\u7801&#xff1a;<\/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\">def<\/span> <span class=\"token function\">sumNumbers<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> root<span class=\"token punctuation\">:<\/span> TreeNode <span class=\"token operator\">|<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>        <span class=\"token keyword\">def<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>            <span class=\"token comment\"># \u5f53\u524d\u5206\u652f\u6ca1\u6709\u8282\u70b9<\/span><br \/>\n            <span class=\"token comment\"># \u5bf9\u6700\u7ec8\u7ed3\u679c\u6ca1\u6709\u8d21\u732e<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> node <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>            <span class=\"token comment\"># \u5148\u628a\u5f53\u524d\u8282\u70b9\u52a0\u5165\u8def\u5f84\u6570\u5b57<\/span><br \/>\n            current_num <span class=\"token operator\">&#061;<\/span> current_num <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> node<span class=\"token punctuation\">.<\/span>val<\/p>\n<p>            <span class=\"token comment\"># \u5de6\u53f3\u5b69\u5b50\u90fd\u4e0d\u5b58\u5728<\/span><br \/>\n            <span class=\"token comment\"># \u8bf4\u660e\u5df2\u7ecf\u6765\u5230\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> node<span class=\"token punctuation\">.<\/span>left <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span> <span class=\"token keyword\">and<\/span> node<span class=\"token punctuation\">.<\/span>right <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> current_num<\/p>\n<p>            <span class=\"token comment\"># \u9012\u5f52\u5904\u7406\u5de6\u53f3\u5b50\u6811<\/span><br \/>\n            num_left <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><br \/>\n            num_right <span class=\"token operator\">&#061;<\/span> dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token comment\"># \u8fd4\u56de\u5f53\u524d\u5b50\u6811\u6240\u6709\u5b8c\u6574\u8def\u5f84\u7684\u6570\u5b57\u4e4b\u548c<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> num_left <span class=\"token operator\">&#043;<\/span> num_right<\/p>\n<p>        <span class=\"token keyword\">return<\/span> dfs<span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h2>\u516b\u3001\u6700\u540e\u603b\u7ed3<\/h2>\n<p>\u8fd9\u9053\u9898\u6700\u5f00\u59cb\u5e76\u4e0d\u9700\u8981\u76f4\u63a5\u60f3\u5230\u5b8c\u6574\u4ee3\u7801\u3002<\/p>\n<p>\u53ef\u4ee5\u4e00\u6b65\u4e00\u6b65\u62c6&#xff1a;<\/p>\n<p>\u7b2c\u4e00\u6b65&#xff1a;<br \/>\n\u4e00\u6761\u8def\u5f84\u4e0a\u7684\u6570\u5b57\u600e\u4e48\u6784\u9020&#xff1f;<\/p>\n<p>current_num &#061; current_num * 10 &#043; node.val<\/p>\n<p>\u7136\u540e\u53d1\u73b0\u6811\u4f1a\u4e0d\u65ad\u5206\u53c9&#xff1a;<\/p>\n<p>\u5f53\u524d\u8282\u70b9<br \/>\n\u2193<br \/>\n\u5de6\u5b50\u6811<br \/>\n\u53f3\u5b50\u6811<\/p>\n<p>\u800c\u6bcf\u4e00\u68f5\u5b50\u6811\u9762\u5bf9\u7684\u90fd\u662f\u540c\u6837\u7684\u95ee\u9898&#xff0c;\u6240\u4ee5\u60f3\u5230\u9012\u5f52\u3002<\/p>\n<p>\u63a5\u7740\u6784\u5efa&#xff1a;<\/p>\n<p>dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5176\u4e2d&#xff1a;<\/p>\n<p>node \u2192 \u5f53\u524d\u8282\u70b9<\/p>\n<p>current_num \u2192 \u5f53\u524d\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u7684\u6570\u5b57<\/p>\n<p>\u8fdb\u5165\u4e00\u5c42\u9012\u5f52\u4ee5\u540e&#xff1a;<\/p>\n<p>1. \u5148\u5904\u7406\u5f53\u524d\u8282\u70b9<\/p>\n<p>2. \u5982\u679c\u662f\u53f6\u5b50\u8282\u70b9<br \/>\n   \u2192 \u5f53\u524d\u8def\u5f84\u7ed3\u675f<br \/>\n   \u2192 \u8fd4\u56de current_num<\/p>\n<p>3. \u5982\u679c\u4e0d\u662f\u53f6\u5b50<br \/>\n   \u2192 \u9012\u5f52\u5de6\u53f3\u5b50\u6811<\/p>\n<p>4. \u7b49\u5de6\u53f3\u5b50\u6811\u8fd4\u56de\u4ee5\u540e<br \/>\n   \u2192 \u6c47\u603b\u7ed3\u679c<br \/>\n   \u2192 return num_left &#043; num_right<\/p>\n<p>\u6240\u4ee5\u6700\u7ec8\u53ef\u4ee5\u628a\u5b83\u7406\u89e3\u6210&#xff1a;<\/p>\n<p>\u5f80\u4e0b&#xff1a;<br \/>\n\u6784\u9020\u6bcf\u4e00\u6761\u8def\u5f84\u5bf9\u5e94\u7684\u6570\u5b57<\/p>\n<p>\u5f80\u4e0a&#xff1a;<br \/>\n\u628a\u6bcf\u4e00\u68f5\u5b50\u6811\u7684\u7b54\u6848\u9010\u5c42\u6c47\u603b<\/p>\n<p>\u4e5f\u5c31\u662f&#xff1a;\u72b6\u6001\u5f80\u4e0b\u4f20&#xff0c;\u7b54\u6848\u5f80\u4e0a\u6536\u3002<\/p>\n<h2>\u4e5d\u3001\u590d\u6742\u5ea6\u5206\u6790<\/h2>\n<p>\u5047\u8bbe\u4e8c\u53c9\u6811\u4e00\u5171\u6709 n \u4e2a\u8282\u70b9\u3002<\/p>\n<h4>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;O(n)<\/h4>\n<p>\u9012\u5f52\u8fc7\u7a0b\u4e2d&#xff0c;\u6bcf\u4e2a\u8282\u70b9\u53ea\u4f1a\u88ab\u8bbf\u95ee\u4e00\u6b21\u3002<\/p>\n<p>\u5bf9\u4e8e\u6bcf\u4e2a\u8282\u70b9&#xff0c;\u6211\u4eec\u505a\u7684\u64cd\u4f5c\u4e5f\u90fd\u662f\u5e38\u6570\u7ea7\u7684&#xff0c;\u4f8b\u5982&#xff1a;<\/p>\n<p>current_num <span class=\"token operator\">&#061;<\/span> current_num <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> node<span class=\"token punctuation\">.<\/span>val<\/p>\n<p>\u4ee5\u53ca\u5224\u65ad\u662f\u5426\u4e3a\u53f6\u5b50\u8282\u70b9\u3002<\/p>\n<p>\u6240\u4ee5\u603b\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a&#xff1a;<\/p>\n<p>O(n)<\/p>\n<hr \/>\n<h4>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;O(h)<\/h4>\n<p>\u8fd9\u91cc\u6ca1\u6709\u989d\u5916\u521b\u5efa\u6570\u7ec4\u6765\u4fdd\u5b58\u6240\u6709\u8def\u5f84&#xff0c;\u4e3b\u8981\u7684\u7a7a\u95f4\u5f00\u9500\u6765\u81ea\u9012\u5f52\u8c03\u7528\u6808\u3002<\/p>\n<p>\u5176\u4e2d h \u8868\u793a\u4e8c\u53c9\u6811\u7684\u9ad8\u5ea6\u3002<\/p>\n<p>\u5982\u679c\u6811\u6bd4\u8f83\u5e73\u8861&#xff1a;<\/p>\n<p>        1<br \/>\n      \/   \\\\<br \/>\n     2     3<br \/>\n    \/ \\\\   \/ \\\\<br \/>\n   &#8230;<\/p>\n<p>\u6811\u9ad8\u5927\u7ea6\u662f log n&#xff0c;\u6240\u4ee5\u7a7a\u95f4\u590d\u6742\u5ea6\u63a5\u8fd1&#xff1a;<\/p>\n<p>O(log n)<\/p>\n<p>\u4f46\u5982\u679c\u6811\u9000\u5316\u6210\u4e00\u6761\u94fe&#xff1a;<\/p>\n<p>1<br \/>\n \\\\<br \/>\n  2<br \/>\n   \\\\<br \/>\n    3<br \/>\n     \\\\<br \/>\n      4<\/p>\n<p>\u9012\u5f52\u6700\u591a\u4f1a\u8fde\u7eed\u8fdb\u5165 n \u5c42&#xff0c;\u56e0\u6b64\u6700\u574f\u60c5\u51b5\u4e0b&#xff1a;<\/p>\n<p>O(n)<\/p>\n<p>\u6240\u4ee5\u4e00\u822c\u5199\u6210&#xff1a;<\/p>\n<p>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;O(n)<br \/>\n\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;O(h)&#xff0c;\u6700\u574f\u60c5\u51b5\u4e0b\u4e3a O(n)<\/p>\n<hr \/>\n<h2>\u5341\u3001\u5176\u4ed6\u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f<\/h2>\n<p>\u524d\u9762\u7684\u6838\u5fc3\u601d\u8def\u5176\u5b9e\u5df2\u7ecf\u786e\u5b9a\u4e86&#xff1a;<\/p>\n<p>\u6bcf\u5f80\u4e0b\u4e00\u5c42&#xff0c;\u90fd\u9700\u8981\u4fdd\u5b58\u5f53\u524d\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u7684\u6570\u5b57\u3002<\/p>\n<p>\u533a\u522b\u4e3b\u8981\u5728\u4e8e&#xff1a;<\/p>\n<p>\u5f97\u5230\u4e00\u6761\u5b8c\u6574\u8def\u5f84\u4ee5\u540e&#xff0c;\u6211\u4eec\u51c6\u5907\u600e\u4e48\u5904\u7406\u8fd9\u4e2a\u7b54\u6848&#xff1f;<\/p>\n<p>\u8fd8\u53ef\u4ee5\u6709\u4e24\u79cd\u5199\u6cd5\u3002<\/p>\n<hr \/>\n<h3>\u65b9\u6cd5\u4e00&#xff1a;\u9012\u5f52 &#043; \u76f4\u63a5\u7d2f\u8ba1\u7b54\u6848<\/h3>\n<p>\u5176\u5b9e\u6211\u4eec\u4e5f\u53ef\u4ee5\u6362\u4e00\u79cd\u60f3\u6cd5\u3002<\/p>\n<p>\u65e2\u7136\u8d70\u5230\u53f6\u5b50\u8282\u70b9\u65f6&#xff0c;\u5c31\u5df2\u7ecf\u5f97\u5230\u4e86\u4e00\u4e2a\u5b8c\u6574\u6570\u5b57&#xff0c;\u4f8b\u5982 495&#xff0c;\u90a3\u4e5f\u53ef\u4ee5\u4e0d\u628a\u5b83\u4e00\u5c42\u5c42 return \u56de\u53bb\u3002<\/p>\n<p>\u800c\u662f\u76f4\u63a5&#xff1a;<\/p>\n<p>total <span class=\"token operator\">&#043;&#061;<\/span> current_num<\/p>\n<p>\u4e5f\u5c31\u662f&#xff1a;<\/p>\n<p>\u5f80\u4e0b\u9012\u5f52<br \/>\n\u2193<br \/>\n\u6784\u9020 current_num<br \/>\n\u2193<br \/>\n\u6765\u5230\u53f6\u5b50<br \/>\n\u2193<br \/>\n\u76f4\u63a5\u52a0\u5165 total<\/p>\n<p>\u4ee3\u7801&#xff1a;<\/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\">def<\/span> <span class=\"token function\">sumNumbers<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> root<span class=\"token punctuation\">:<\/span> TreeNode <span class=\"token operator\">|<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>        total <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>        <span class=\"token keyword\">def<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">nonlocal<\/span> total<\/p>\n<p>            <span class=\"token keyword\">if<\/span> node <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><\/p>\n<p>            current_num <span class=\"token operator\">&#061;<\/span> current_num <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> node<span class=\"token punctuation\">.<\/span>val<\/p>\n<p>            <span class=\"token keyword\">if<\/span> node<span class=\"token punctuation\">.<\/span>left <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span> <span class=\"token keyword\">and<\/span> node<span class=\"token punctuation\">.<\/span>right <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                total <span class=\"token operator\">&#043;&#061;<\/span> current_num<br \/>\n                <span class=\"token keyword\">return<\/span><\/p>\n<p>            dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><br \/>\n            dfs<span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><\/p>\n<p>        dfs<span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> total<\/p>\n<p>\u590d\u6742\u5ea6\u540c\u6837\u662f&#xff1a;<\/p>\n<p>\u65f6\u95f4&#xff1a;O(n)<br \/>\n\u7a7a\u95f4&#xff1a;O(h)<\/p>\n<p>\u548c\u7b2c\u4e00\u79cd\u65b9\u6cd5\u76f8\u6bd4&#xff0c;\u533a\u522b\u5728\u4e8e&#xff1a;<\/p>\n<p>\u65b9\u6cd5\u4e00&#xff1a;<\/p>\n<p>\u53f6\u5b50<br \/>\n\u2193<br \/>\nreturn<br \/>\n\u2193<br \/>\n\u7236\u8282\u70b9\u6c47\u603b<br \/>\n\u2193<br \/>\n\u7ee7\u7eed return<\/p>\n<p>\u65b9\u6cd5\u4e8c&#xff1a;<\/p>\n<p>\u53f6\u5b50<br \/>\n\u2193<br \/>\n\u76f4\u63a5\u52a0\u5165 total<\/p>\n<p>\u6240\u4ee5\u7b2c\u4e8c\u79cd\u4e0d\u518d\u9700\u8981&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> num_left <span class=\"token operator\">&#043;<\/span> num_right<\/p>\n<p>\u56e0\u4e3a\u6240\u6709\u7b54\u6848\u5df2\u7ecf\u5728\u53f6\u5b50\u8282\u70b9\u5904\u76f4\u63a5\u7d2f\u8ba1\u8d77\u6765\u4e86\u3002<\/p>\n<hr \/>\n<h3>\u65b9\u6cd5\u4e8c&#xff1a;\u4e0d\u7528\u9012\u5f52&#xff0c;\u81ea\u5df1\u7ef4\u62a4\u6808<\/h3>\n<p>\u524d\u4e24\u79cd\u65b9\u6cd5\u90fd\u4f9d\u8d56\u9012\u5f52\u3002<\/p>\n<p>\u4f46\u9012\u5f52\u672c\u8d28\u4e0a\u4f1a\u5229\u7528\u51fd\u6570\u8c03\u7528\u6808\u4fdd\u5b58&#xff1a;<\/p>\n<p>\u5f53\u524d\u5904\u7406\u5230\u54ea\u91cc<br \/>\n\u4ee5\u53ca\u8fd9\u4e00\u5c42\u7684\u72b6\u6001<\/p>\n<p>\u6240\u4ee5\u6211\u4eec\u4e5f\u53ef\u4ee5\u81ea\u5df1\u521b\u5efa\u4e00\u4e2a\u6808&#xff0c;\u5b9e\u73b0\u8fed\u4ee3\u7248 DFS\u3002<\/p>\n<p>\u4e0d\u8fc7\u6808\u91cc\u9762\u4e0d\u80fd\u53ea\u4fdd\u5b58&#xff1a;<\/p>\n<p>node<\/p>\n<p>\u56e0\u4e3a\u53ea\u77e5\u9053\u5f53\u524d\u8282\u70b9\u662f\u8c01\u8fd8\u4e0d\u591f\u3002<\/p>\n<p>\u4f8b\u5982\u6765\u5230\u8282\u70b9 9 \u65f6&#xff0c;\u6211\u4eec\u8fd8\u5fc5\u987b\u77e5\u9053\u524d\u9762\u7684\u8def\u5f84\u5df2\u7ecf\u7ec4\u6210\u4e86 4&#xff0c;\u624d\u80fd\u7ee7\u7eed\u5f97\u5230 49\u3002<\/p>\n<p>\u56e0\u6b64\u6808\u4e2d\u4fdd\u5b58&#xff1a;<\/p>\n<p><span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4ee3\u7801&#xff1a;<\/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\">def<\/span> <span class=\"token function\">sumNumbers<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> root<span class=\"token punctuation\">:<\/span> TreeNode <span class=\"token operator\">|<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> root <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>        total <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><\/p>\n<p>        stack <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span> stack<span class=\"token punctuation\">:<\/span><\/p>\n<p>            node<span class=\"token punctuation\">,<\/span> current_num <span class=\"token operator\">&#061;<\/span> stack<span class=\"token punctuation\">.<\/span>pop<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>            current_num <span class=\"token operator\">&#061;<\/span> current_num <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> node<span class=\"token punctuation\">.<\/span>val<\/p>\n<p>            <span class=\"token keyword\">if<\/span> node<span class=\"token punctuation\">.<\/span>left <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span> <span class=\"token keyword\">and<\/span> node<span class=\"token punctuation\">.<\/span>right <span class=\"token keyword\">is<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                total <span class=\"token operator\">&#043;&#061;<\/span> current_num<br \/>\n                <span class=\"token keyword\">continue<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> node<span class=\"token punctuation\">.<\/span>left <span class=\"token keyword\">is<\/span> <span class=\"token keyword\">not<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                stack<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> node<span class=\"token punctuation\">.<\/span>right <span class=\"token keyword\">is<\/span> <span class=\"token keyword\">not<\/span> <span class=\"token boolean\">None<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                stack<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">,<\/span> current_num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> total<\/p>\n<p>\u8fd9\u91cc&#xff1a;<\/p>\n<p>stack<span class=\"token punctuation\">.<\/span>pop<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4f53\u73b0\u7684\u662f\u6808\u7684&#xff1a;<\/p>\n<p>\u540e\u8fdb\u5148\u51fa<\/p>\n<p>\u6240\u4ee5\u5b83\u4f1a\u6cbf\u7740\u67d0\u4e00\u6761\u8def\u5f84\u4e0d\u65ad\u5f80\u6df1\u5904\u8d70&#xff0c;\u8fd9\u5c31\u662f DFS\u3002<\/p>\n<p>\u590d\u6742\u5ea6&#xff1a;<\/p>\n<p>\u65f6\u95f4&#xff1a;O(n)<br \/>\n\u7a7a\u95f4&#xff1a;O(h)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LeetCode 129&#xff5c;\u6c42\u6839\u8282\u70b9\u5230\u53f6\u8282\u70b9\u6570\u5b57\u4e4b\u548c<br \/>\n\u4e00\u3001\u9898\u76ee\u8981\u505a\u4ec0\u4e48?<br \/>\n\u5047\u8bbe\u6709\u8fd9\u6837\u4e00\u68f5\u6811&#xff1a;4\/ \\\\9   0\/ \\\\5   1\u8fd9\u91cc\u7684\u53f6\u5b50\u8282\u70b9\u662f&#xff1a;5\u30011\u30010<br \/>\n\u6240\u8c13\u53f6\u5b50\u8282\u70b9&#xff0c;\u5c31\u662f&#xff1a;\u5de6\u5b69\u5b50\u548c\u53f3\u5b69\u5b50\u90fd\u4e0d\u5b58\u5728\u7684\u8282\u70b9\u3002\u6240\u4ee5&#xff1a;<br \/>\n\u53ea\u6709\u5de6\u5b69\u5b50\u4e3a\u7a7a&#xff0c;\u4e0d\u4e00\u5b9a\u662f\u53f6\u5b50&#xff1b;\u53ea\u6709\u53f3\u5b69\u5b50\u4e3a\u7a7a&#xff0c;\u4e5f\u4e0d\u4e00\u5b9a\u662f\u53f6\u5b50&#xff1b;\u5fc5\u987b\u5de6\u53f3\u5b69\u5b50\u90fd\u4e3a\u7a7a&#xff0c;\u624d\u662f\u53f6\u5b50\u3002<br \/>\n\u9898\u76ee\u8981\u6c42\u6211\u4eec\u4ece\u6839\u8282\u70b9<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11653,2692,81,50,305,427],"topic":[],"class_list":["post-106894","post","type-post","status-publish","format-standard","hentry","category-server","tag-11653","tag-leetcode","tag-python","tag-50","tag-305","tag-427"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>DAY12: LeetCode 129\uff5c\u6c42\u6839\u8282\u70b9\u5230\u53f6\u8282\u70b9\u6570\u5b57\u4e4b\u548c - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/106894.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DAY12: LeetCode 129\uff5c\u6c42\u6839\u8282\u70b9\u5230\u53f6\u8282\u70b9\u6570\u5b57\u4e4b\u548c - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"LeetCode 129&#xff5c;\u6c42\u6839\u8282\u70b9\u5230\u53f6\u8282\u70b9\u6570\u5b57\u4e4b\u548c \u4e00\u3001\u9898\u76ee\u8981\u505a\u4ec0\u4e48? \u5047\u8bbe\u6709\u8fd9\u6837\u4e00\u68f5\u6811&#xff1a;4\/ \\9  0\/ \\5  1\u8fd9\u91cc\u7684\u53f6\u5b50\u8282\u70b9\u662f&#xff1a;5\u30011\u30010 \u6240\u8c13\u53f6\u5b50\u8282\u70b9&#xff0c;\u5c31\u662f&#xff1a;\u5de6\u5b69\u5b50\u548c\u53f3\u5b69\u5b50\u90fd\u4e0d\u5b58\u5728\u7684\u8282\u70b9\u3002\u6240\u4ee5&#xff1a; \u53ea\u6709\u5de6\u5b69\u5b50\u4e3a\u7a7a&#xff0c;\u4e0d\u4e00\u5b9a\u662f\u53f6\u5b50&#xff1b;\u53ea\u6709\u53f3\u5b69\u5b50\u4e3a\u7a7a&#xff0c;\u4e5f\u4e0d\u4e00\u5b9a\u662f\u53f6\u5b50&#xff1b;\u5fc5\u987b\u5de6\u53f3\u5b69\u5b50\u90fd\u4e3a\u7a7a&#xff0c;\u624d\u662f\u53f6\u5b50\u3002 \u9898\u76ee\u8981\u6c42\u6211\u4eec\u4ece\u6839\u8282\u70b9\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/106894.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-18T06:24:32+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 \u5206\" \/>\n<script 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