{"id":70225,"date":"2026-02-01T16:57:31","date_gmt":"2026-02-01T08:57:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/70225.html"},"modified":"2026-02-01T16:57:31","modified_gmt":"2026-02-01T08:57:31","slug":"%e4%b8%8a%e6%b5%b7%e8%ae%a1%e7%ae%97%e6%9c%ba%e5%ad%a6%e4%bc%9a2026%e5%b9%b41%e6%9c%88%e6%9c%88%e8%b5%9bc%e4%b8%99%e7%bb%84t4-%e5%88%86%e5%bd%a2%e5%8d%81%e5%ad%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/70225.html","title":{"rendered":"\u4e0a\u6d77\u8ba1\u7b97\u673a\u5b66\u4f1a2026\u5e741\u6708\u6708\u8d5bC++\u4e19\u7ec4T4 \u5206\u5f62\u5341\u5b57"},"content":{"rendered":"<h3>\u5206\u5f62\u5341\u5b57<\/h3>\n<p>\u5185\u5b58\u9650\u5236: 256 Mb<br \/>\n\u65f6\u95f4\u9650\u5236: 1000 ms<\/p>\n<h4>\u9898\u76ee\u63cf\u8ff0<\/h4>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570 N&#xff0c;\u8bf7\u6253\u5370\u51fa\u4e00\u4e2a\u7ea7\u522b\u4e3a N \u7684\u5206\u5f62\u5341\u5b57&#xff0c;\u5206\u5f62\u5341\u5b57\u5b9a\u4e49\u5982\u4e0b&#xff1a;<br \/>\n0 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class=\"mord\"><span class=\"mord\">3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8413em\"><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\" style=\"margin-right: 0.109em\">N<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff1b;<\/li>\n<li>\u7528\u5168\u5c40\u4e8c\u7ef4\u5b57\u7b26\u6570\u7ec4\u5b58\u50a8\u56fe\u6848&#xff08;\u6570\u7ec4\u5927\u5c0f2200\u00d72200&#xff0c;\u8db3\u591f\u8986\u76d6N\u22647\u7684\u573a\u666f&#xff0c;\u56e0\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">37&#061;21873^7&#061;2187<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\"><span class=\"mord\">3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><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 mtight\">7<\/span><\/span><\/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\">2187<\/span><\/span><\/span><\/span><\/span>&#xff09;&#xff1b;<\/li>\n<li>\u9012\u5f52\u51fd\u6570 dfs \u8d1f\u8d23\u586b\u5145\u5341\u5b57\u7684\u5173\u952e\u4f4d\u7f6e&#xff1a;\u5148\u586b\u5145\u4e2d\u5fc3\u7684\u5b50\u5341\u5b57&#xff0c;\u518d\u5c06\u4e2d\u5fc3\u5185\u5bb9\u590d\u5236\u5230\u4e0a\u3001\u4e0b\u3001\u5de6\u3001\u53f3\u56db\u4e2a\u65b9\u5411&#xff0c;\u540c\u65f6\u5c06\u56db\u89d2\u586b\u5145\u4e3a.\u3002<\/li>\n<\/ul>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;bits\/stdc&#043;&#043;.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5168\u5c40\u4e8c\u7ef4\u5b57\u7b26\u6570\u7ec4&#xff0c;\u5b58\u50a8\u5206\u5f62\u5341\u5b57\u56fe\u6848<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5927\u5c0f2200\u00d72200&#xff1a;\u56e0\u9898\u76eeN\u22647&#xff0c;3^7&#061;2187&#xff0c;2200\u8db3\u591f\u5bb9\u7eb3\u4e14\u907f\u514d\u8d8a\u754c<\/span><br \/>\n<span class=\"token keyword\">char<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">2200<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2200<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u9012\u5f52\u586b\u5145\u5206\u5f62\u5341\u5b57\u7684DFS\u51fd\u6570<br \/>\n * &#064;param s \u5f53\u524d\u5b50\u533a\u57df\u7684\u5de6\u4e0a\u89d2\u8d77\u59cb\u5750\u6807&#xff08;1-based\u7d22\u5f15&#xff09;<br \/>\n * &#064;param x \u5f53\u524d\u5b50\u533a\u57df\u7684\u8fb9\u957f<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9012\u5f52\u7ec8\u6b62\u6761\u4ef6&#xff1a;x&#061;1\u5bf9\u5e940\u7ea7\u5206\u5f62\u5341\u5b57&#xff08;\u4ec5\u5355\u4e2a&#039;&#043;&#039;&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>x <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5728\u5f53\u524d\u5b50\u533a\u57df\u7684\u4e2d\u5fc3\u4f4d\u7f6e&#xff08;s,s&#xff09;\u653e\u7f6e&#039;&#043;&#039;<\/span><br \/>\n        a<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;&#043;&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c06\u5f53\u524d\u8fb9\u957f\u9664\u4ee53&#xff0c;\u5f97\u5230\u4e0b\u4e00\u7ea7\u5b50\u533a\u57df\u7684\u8fb9\u957f<\/span><br \/>\n    x <span class=\"token operator\">\/&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9012\u5f52\u586b\u5145\u5f53\u524d\u533a\u57df\u4e2d\u5fc3\u7684k-1\u7ea7\u5206\u5f62\u5341\u5b57<\/span><br \/>\n    <span class=\"token comment\">\/\/ s&#043;x\u662f\u4e2d\u5fc3\u5b50\u533a\u57df\u7684\u5de6\u4e0a\u89d2\u5750\u6807&#xff08;\u539f\u533a\u57df\u8d77\u59cb&#043;\u5b50\u8fb9\u957f&#xff09;<\/span><br \/>\n    <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">,<\/span> x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u904d\u5386\u4e2d\u5fc3\u5b50\u533a\u57df\u7684\u6240\u6709\u4f4d\u7f6e&#xff0c;\u5c06\u5185\u5bb9\u590d\u5236\u5230\u4e0a\u3001\u4e0b\u3001\u5de6\u3001\u53f3\u56db\u4e2a\u65b9\u5411<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e2d\u5fc3\u5b50\u533a\u57df\u8303\u56f4&#xff1a;\u884c[i]\u4eces&#043;x\u5230s&#043;x&#043;x-1&#xff0c;\u5217[j]\u540c\u7406<\/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> s <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> s <span class=\"token operator\">&#043;<\/span> x <span class=\"token operator\">&#043;<\/span> x<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\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> s <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> s <span class=\"token operator\">&#043;<\/span> x <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5411\u4e0a\u590d\u5236&#xff1a;\u5f53\u524d\u884c\u5411\u4e0a\u504f\u79fbx\u884c<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#8211;<\/span> x<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5411\u4e0b\u590d\u5236&#xff1a;\u5f53\u524d\u884c\u5411\u4e0b\u504f\u79fbx\u884c<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5411\u5de6\u590d\u5236&#xff1a;\u5f53\u524d\u5217\u5411\u5de6\u504f\u79fbx\u5217<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#8211;<\/span> x<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5411\u53f3\u590d\u5236&#xff1a;\u5f53\u524d\u5217\u5411\u53f3\u504f\u79fbx\u5217<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u586b\u5145\u56db\u89d2\u4e3a&#039;.&#039;&#xff08;\u4fdd\u8bc1\u5206\u5f62\u5341\u5b57\u7684\u56db\u89d2\u65e0&#039;&#043;&#039;&#xff09;<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#8211;<\/span> x<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#8211;<\/span> x<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;.&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4e0a\u5de6\u89d2<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#8211;<\/span> x<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;.&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4e0b\u5de6\u89d2<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#8211;<\/span> x<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;.&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4e0a\u53f3\u89d2<\/span><br \/>\n            a<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#043;<\/span> x<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;.&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4e0b\u53f3\u89d2<\/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\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bfb\u53d6\u8f93\u5165\u7684\u5206\u5f62\u7ea7\u522bN<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n<span class=\"token punctuation\">;<\/span><br \/>\n    cin <span class=\"token operator\">&gt;&gt;<\/span> n<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8ba1\u7b97\u5206\u5f62\u5341\u5b57\u7684\u603b\u8fb9\u957f&#xff1a;3^n&#xff08;0\u7ea71&#xff0c;1\u7ea73&#xff0c;2\u7ea79&#8230;&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> m <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> n<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        m <span class=\"token operator\">*&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8c03\u7528DFS\u51fd\u6570&#xff0c;\u4ece\u6574\u4e2a\u56fe\u6848\u7684\u5de6\u4e0a\u89d2(1,1)\u5f00\u59cb\u586b\u5145n\u7ea7\u5206\u5f62\u5341\u5b57<\/span><br \/>\n    <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> m<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u904d\u5386\u4e8c\u7ef4\u6570\u7ec4&#xff0c;\u9010\u884c\u6253\u5370\u5206\u5f62\u5341\u5b57\u56fe\u6848<\/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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> m<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\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;&#061;<\/span> m<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            cout <span class=\"token operator\">&lt;&lt;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6bcf\u884c\u6253\u5370\u5b8c\u540e\u6362\u884c<\/span><br \/>\n        cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u5173\u952e\u53d8\u91cf\u4e0e\u51fd\u6570\u89e3\u6790<\/h3>\n<h4>1. \u5168\u5c40\u6570\u7ec4 a[2200][2200]<\/h4>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u5b58\u50a8\u5206\u5f62\u5341\u5b57\u7684\u6bcf\u4e2a\u4f4d\u7f6e\u5b57\u7b26&#xff0c;\u521d\u59cb\u65f6\u6570\u7ec4\u503c\u4e3a\u968f\u673a\u503c&#xff0c;\u4f46\u9012\u5f52\u8fc7\u7a0b\u4e2d\u4f1a\u8986\u76d6\u4e3a&#043;\u6216.&#xff1b;<\/li>\n<li>\u5927\u5c0f&#xff1a;2200\u00d72200&#xff0c;\u6ee1\u8db3\u9898\u76ee\u4e2dN\u22647\u7684\u6700\u5927\u8fb9\u957f&#xff08;2187&#xff09;\u9700\u6c42&#xff0c;\u907f\u514d\u6570\u7ec4\u8d8a\u754c\u3002<\/li>\n<\/ul>\n<h4>2. \u9012\u5f52\u51fd\u6570 dfs(int s, int x)<\/h4>\n<ul>\n<li>\u53c2\u6570\u8bf4\u660e&#xff1a;\n<ul>\n<li>s&#xff1a;\u5f53\u524d\u5b50\u533a\u57df\u7684\u5de6\u4e0a\u89d2\u8d77\u59cb\u5750\u6807&#xff08;\u4ee3\u7801\u91c7\u75281-based\u7d22\u5f15&#xff0c;\u5373\u4ece1\u5f00\u59cb\u8ba1\u6570&#xff09;&#xff1b;<\/li>\n<li>x&#xff1a;\u5f53\u524d\u5b50\u533a\u57df\u7684\u8fb9\u957f\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u6267\u884c\u903b\u8f91&#xff1a;\n<li>\u7ec8\u6b62\u6761\u4ef6&#xff08;0\u7ea7\u5341\u5b57&#xff09;&#xff1a;\u5f53 x&#061;&#061;1 \u65f6&#xff0c;\u5728\u5f53\u524d\u5b50\u533a\u57df\u7684\u4e2d\u5fc3&#xff08;\u5373\u5750\u6807(s,s)&#xff09;\u653e\u7f6e&#043;&#xff0c;\u76f4\u63a5\u8fd4\u56de&#xff1b;<\/li>\n<li>\u9012\u5f52\u5206\u89e3&#xff1a;\u5c06\u5f53\u524d\u8fb9\u957f x \u9664\u4ee53&#xff0c;\u5f97\u5230\u4e0b\u4e00\u7ea7\u5b50\u533a\u57df\u7684\u8fb9\u957f&#xff08;\u8bb0\u4e3a\u65b0\u7684x&#xff09;&#xff1b;<\/li>\n<li>\u586b\u5145\u4e2d\u5fc3\u5b50\u5341\u5b57&#xff1a;\u8c03\u7528 dfs(s&#043;x, x)&#xff0c;\u586b\u5145\u5f53\u524d\u533a\u57df\u4e2d\u5fc3\u7684k-1\u7ea7\u5341\u5b57&#xff1b;<\/li>\n<li>\u590d\u5236\u4e2d\u5fc3\u5185\u5bb9\u5230\u56db\u5411&#xff1a;\u904d\u5386\u4e2d\u5fc3\u5b50\u533a\u57df\u7684\u6240\u6709\u4f4d\u7f6e&#xff0c;\u5c06\u6bcf\u4e2a\u4f4d\u7f6e\u7684\u5b57\u7b26\u590d\u5236\u5230&#xff1a;\n<ul>\n<li>\u4e0a\u65b9&#xff1a;a[i-x][j] &#061; a[i][j]&#xff08;i-x\u4e3a\u5f53\u524d\u884c\u5411\u4e0a\u504f\u79fbx\u884c&#xff09;&#xff1b;<\/li>\n<li>\u4e0b\u65b9&#xff1a;a[i&#043;x][j] &#061; a[i][j]&#xff08;i&#043;x\u4e3a\u5f53\u524d\u884c\u5411\u4e0b\u504f\u79fbx\u884c&#xff09;&#xff1b;<\/li>\n<li>\u5de6\u65b9&#xff1a;a[i][j-x] &#061; a[i][j]&#xff08;j-x\u4e3a\u5f53\u524d\u5217\u5411\u5de6\u504f\u79fbx\u5217&#xff09;&#xff1b;<\/li>\n<li>\u53f3\u65b9&#xff1a;a[i][j&#043;x] &#061; a[i][j]&#xff08;j&#043;x\u4e3a\u5f53\u524d\u5217\u5411\u53f3\u504f\u79fbx\u5217&#xff09;&#xff1b;<\/li>\n<\/ul>\n<\/li>\n<li>\u586b\u5145\u56db\u89d2\u4e3a.&#xff1a;\u5c06\u4e2d\u5fc3\u5b50\u533a\u57df\u56db\u4e2a\u5bf9\u89d2\u7684\u4f4d\u7f6e&#xff08;\u4e0a\u5de6\u3001\u4e0b\u5de6\u3001\u4e0a\u53f3\u3001\u4e0b\u53f3&#xff09;\u8bbe\u4e3a.&#xff0c;\u4fdd\u8bc1\u56db\u89d2\u65e0&#043;\u3002<\/li>\n<\/li>\n<\/ul>\n<h4>3. \u4e3b\u51fd\u6570 main()<\/h4>\n<ul>\n<li>\u6b65\u9aa41&#xff1a;\u8bfb\u53d6\u8f93\u5165\u7684\u7ea7\u522bn&#xff1b;<\/li>\n<li>\u6b65\u9aa42&#xff1a;\u8ba1\u7b97\u603b\u8fb9\u957fm&#xff1a;\u901a\u8fc7\u5faa\u73af\u5c061\u4e58\u4ee53\u5171n\u6b21&#xff0c;\u5f97\u5230 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">m&#061;3nm&#061;3^n<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">m<\/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: 0.6644em\"><\/span><span class=\"mord\"><span class=\"mord\">3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.6644em\"><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><\/span><\/span><\/span><\/span><\/span><\/span><\/span>&#xff1b;<\/li>\n<li>\u6b65\u9aa43&#xff1a;\u8c03\u7528 dfs(1, m)&#xff0c;\u4ece\u6574\u4e2a\u56fe\u6848\u7684\u5de6\u4e0a\u89d2&#xff08;\u5750\u68071,1&#xff09;\u5f00\u59cb\u586b\u5145n\u7ea7\u5341\u5b57&#xff1b;<\/li>\n<li>\u6b65\u9aa44&#xff1a;\u53cc\u91cd\u5faa\u73af\u904d\u5386\u6570\u7ec4&#xff0c;\u9010\u884c\u6253\u5370\u5206\u5f62\u5341\u5b57\u56fe\u6848\u3002<\/li>\n<\/ul>\n<h3>\u6837\u4f8b\u6267\u884c\u8fc7\u7a0b&#xff08;\u8f93\u5165n&#061;1&#xff09;<\/h3>\n<p>\u4ee5\u8f93\u51651\u4e3a\u4f8b&#xff0c;\u62c6\u89e3\u4ee3\u7801\u6267\u884c\u6d41\u7a0b&#xff1a;<\/p>\n<li>main\u51fd\u6570\u4e2d&#xff0c;n&#061;1&#xff0c;\u8ba1\u7b97m&#061;3&#xff08;1\u00d73&#xff09;&#xff1b;<\/li>\n<li>\u8c03\u7528 dfs(1, 3)&#xff1a;\n<ul>\n<li>x&#061;3\u22601&#xff0c;\u6267\u884cx\/&#061;3 \u2192 x&#061;1&#xff1b;<\/li>\n<li>\u8c03\u7528 dfs(1&#043;1, 1) &#061; dfs(2,1)&#xff1a;\n<ul>\n<li>x&#061;1&#xff0c;\u89e6\u53d1\u7ec8\u6b62\u6761\u4ef6&#xff0c;\u8bbe\u7f6ea[2][2]&#061;&#039;&#043;&#039;&#xff0c;\u8fd4\u56de&#xff1b;<\/li>\n<\/ul>\n<\/li>\n<li>\u8fdb\u5165\u5faa\u73af&#xff1a;i\u4ece1&#043;1&#061;2\u52301&#043;1&#043;1-1&#061;2&#xff08;\u5373i&#061;2&#xff09;&#xff0c;j\u540c\u7406\u4ece2\u52302&#xff1b;<\/li>\n<li>\u6267\u884c\u5faa\u73af\u5185\u903b\u8f91&#xff1a;\n<ul>\n<li>a[2-1][2] &#061; a[2][2] \u2192 a[1][2]&#061;&#039;&#043;&#039;&#xff08;\u4e0a\u65b9&#xff09;&#xff1b;<\/li>\n<li>a[2&#043;1][2] &#061; a[2][2] \u2192 a[3][2]&#061;&#039;&#043;&#039;&#xff08;\u4e0b\u65b9&#xff09;&#xff1b;<\/li>\n<li>a[2][2-1] &#061; a[2][2] \u2192 a[2][1]&#061;&#039;&#043;&#039;&#xff08;\u5de6\u65b9&#xff09;&#xff1b;<\/li>\n<li>a[2][2&#043;1] &#061; a[2][2] \u2192 a[2][3]&#061;&#039;&#043;&#039;&#xff08;\u53f3\u65b9&#xff09;&#xff1b;<\/li>\n<li>\u56db\u89d2\u8bbe\u4e3a.&#xff1a;a[1][1]&#061;&#039;.&#039;\u3001a[3][1]&#061;&#039;.&#039;\u3001a[1][3]&#061;&#039;.&#039;\u3001a[3][3]&#061;&#039;.&#039;&#xff1b;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u6253\u5370\u6570\u7ec4&#xff1a;\n<ul>\n<li>\u7b2c1\u884c&#xff1a;a[1][1]a[1][2]a[1][3] \u2192 .&#043;.&#xff1b;<\/li>\n<li>\u7b2c2\u884c&#xff1a;a[2][1]a[2][2]a[2][3] \u2192 &#043;&#043;&#043;&#xff1b;<\/li>\n<li>\u7b2c3\u884c&#xff1a;a[3][1]a[3][2]a[3][3] \u2192 .&#043;.&#xff1b;<br \/>\n\u6700\u7ec8\u8f93\u51fa\u4e0e\u6837\u4f8b\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<\/li>\n<h3>\u603b\u7ed3<\/h3>\n<li>\u4ee3\u7801\u6838\u5fc3\u662f\u9012\u5f52\u5206\u89e3&#043;\u4e2d\u5fc3\u590d\u5236&#xff1a;\u5c06k\u7ea7\u5341\u5b57\u5206\u89e3\u4e3a\u4e2d\u5fc3\u7684k-1\u7ea7\u5341\u5b57&#xff0c;\u518d\u590d\u5236\u5230\u56db\u5411&#xff0c;\u56db\u89d2\u586b\u5145.&#xff1b;<\/li>\n<li>\u5750\u6807\u91c7\u75281-based\u7d22\u5f15&#xff0c;\u9012\u5f52\u51fd\u6570\u7684s\u662f\u5b50\u533a\u57df\u8d77\u59cb\u5750\u6807&#xff0c;x\u662f\u5b50\u533a\u57df\u8fb9\u957f&#xff1b;<\/li>\n<li>\u6570\u7ec4\u5927\u5c0f2200\u00d72200\u9002\u914dN\u22647\u7684\u6700\u5927\u8fb9\u957f&#xff0c;\u907f\u514d\u8d8a\u754c&#xff0c;\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6\u5bf9\u5e940\u7ea7\u5341\u5b57\u7684\u5355\u4e2a&#043;\u3002<\/li>\n","protected":false},"excerpt":{"rendered":"<p>\u5206\u5f62\u5341\u5b57<br \/>\n\u5185\u5b58\u9650\u5236: 256 Mb<br \/>\n\u65f6\u95f4\u9650\u5236: 1000 ms<br 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