{"id":86389,"date":"2026-07-28T15:32:47","date_gmt":"2026-07-28T07:32:47","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/86389.html"},"modified":"2026-07-28T15:32:47","modified_gmt":"2026-07-28T07:32:47","slug":"2026-%e5%b9%b4-pta-%e5%9b%a2%e4%bd%93%e7%a8%8b%e5%ba%8f%e8%ae%be%e8%ae%a1%e5%a4%a9%e6%a2%af%e8%b5%9b-%e9%a2%98%e8%a7%a3%e5%a4%8d%e7%9b%98%e4%b8%8e%e5%a4%87%e8%b5%9b%e7%bb%8f%e9%aa%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/86389.html","title":{"rendered":"2026 \u5e74 PTA \u56e2\u4f53\u7a0b\u5e8f\u8bbe\u8ba1\u5929\u68af\u8d5b \u9898\u89e3\u590d\u76d8\u4e0e\u5907\u8d5b\u7ecf\u9a8c"},"content":{"rendered":"<p>\u672c\u6b21\u6bd4\u8d5b\u6211\u4e2a\u4eba\u5f97\u5206\u8ddd\u79bb 175 \u5206\u7ebf\u4ec5\u5dee\u6570\u5206&#xff0c;\u4e3b\u8981\u5931\u5206\u70b9\u5728 L2-1 \u5361\u70b9\u672a\u5168\u8fc7\u3001L2-4 \u53d1\u6325\u5931\u8bef\u672a\u80fd\u5b8c\u8d5b&#xff0c;\u6700\u7ec8\u4f9d\u9760\u961f\u53cb\u7684\u7a33\u5b9a\u53d1\u6325&#xff0c;\u56e2\u961f\u62ff\u4e0b\u4e86\u5168\u56fd\u4e09\u7b49\u5956\u3002 \u672c\u6587\u4fa7\u91cd\u68b3\u7406\u9898\u76ee\u601d\u8def\u3001\u5e94\u8bd5\u6280\u5de7\u4e0e\u5907\u8d5b\u7ecf\u9a8c&#xff0c;\u91cd\u70b9\u8be6\u89e3 L2 \u90e8\u5206&#xff0c;L3 \u5c06\u5728\u540e\u7eed\u66f4\u65b0\u8865\u5145\u3002<\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u5c0f\u6280\u5de7<\/li>\n<li>\n<ul>\n<li>1. vector \u5e26\u7a7a\u683c\u6807\u51c6\u8f93\u51fa\u6a21\u677f<\/li>\n<li>2. \u6574\u884c\u8f93\u5165\u5fc5\u638c\u63e1&#xff1a;getline<\/li>\n<\/ul>\n<\/li>\n<li>L1 \u9898\u76ee\u590d\u76d8\u4e0e\u8003\u70b9\u603b\u7ed3<\/li>\n<li>L2 \u9898\u76ee\u8be6\u89e3&#xff08;\u91cd\u70b9&#xff09;<\/li>\n<li>\n<ul>\n<li>L2-1 \u6808\u6a21\u62df\u5927\u9898<\/li>\n<li>L2-2 \u679a\u4e3e &#043; \u4e8c\u5206\u67e5\u8be2\u9898<\/li>\n<li>L2-3 \u6811\u7684 DFS \u6700\u5927\u8def\u5f84\u6700\u5c0f\u503c<\/li>\n<li>L2-4 \u6392\u5e8f &#043; DFS \u9898<\/li>\n<\/ul>\n<\/li>\n<li>\u5907\u8d5b\u7ecf\u9a8c\u4e0e\u5237\u9898\u5efa\u8bae<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<p>PTA\u5b98\u7f51\u771f\u9898&#xff1a;https:\/\/pintia.cn\/problem-sets\/994805046380707840\/exam\/problems\/type\/7<\/p>\n<h3>\u5c0f\u6280\u5de7<\/h3>\n<p>PTA \u5e73\u53f0\u5bf9\u8f93\u51fa\u683c\u5f0f\u7684\u8981\u6c42\u6781\u5176\u4e25\u683c&#xff0c;\u7a7a\u683c\u3001\u6362\u884c\u7684\u7ec6\u5fae\u504f\u5dee\u90fd\u4f1a\u76f4\u63a5\u5bfc\u81f4\u6d4b\u8bd5\u70b9\u4e0d\u901a\u8fc7&#xff0c;\u8fd9\u91cc\u5206\u4eab\u4e24\u4e2a\u8003\u573a\u9ad8\u9891\u4f7f\u7528\u7684\u5b9e\u7528\u6a21\u677f\u4e0e\u7ec6\u8282&#xff1a;<\/p>\n<h4>1. vector \u5e26\u7a7a\u683c\u6807\u51c6\u8f93\u51fa\u6a21\u677f<\/h4>\n<p>\u9488\u5bf9\u300c\u5143\u7d20\u95f4\u7528\u7a7a\u683c\u5206\u9694\u3001\u884c\u672b\u4e0d\u80fd\u6709\u591a\u4f59\u7a7a\u683c\u300d\u7684\u7ecf\u5178\u8f93\u51fa\u573a\u666f&#xff0c;\u6700\u7a33\u59a5\u4e14\u4e0d\u6613\u51fa\u9519\u7684\u5199\u6cd5\u5982\u4e0b&#xff1a;<\/p>\n<p>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span>ans<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> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">(<\/span>ans<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><span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039; &#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> ans<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5173\u952e\u7ec6\u8282\u63d0\u9192&#xff1a;vector.size() \u7684\u8fd4\u56de\u503c\u662f\u65e0\u7b26\u53f7\u7c7b\u578b size_t&#xff0c;\u76f4\u63a5\u53c2\u4e0e\u8fd0\u7b97\u6216\u6bd4\u8f83\u65f6&#xff0c;\u8fb9\u754c\u573a\u666f\u4e0b\u53ef\u80fd\u51fa\u73b0\u9690\u5f0f\u8f6c\u6362\u5f02\u5e38\u3002\u52a1\u5fc5\u5148\u7528 int \u5f3a\u8f6c\u540e\u518d\u4f7f\u7528&#xff0c;\u907f\u514d\u56e0\u7c7b\u578b\u95ee\u9898\u4ea7\u751f\u96be\u4ee5\u6392\u67e5\u7684 bug\u3002<\/p>\n<h4>2. \u6574\u884c\u8f93\u5165\u5fc5\u638c\u63e1&#xff1a;getline<\/h4>\n<p>PTA \u7684\u5b57\u7b26\u4e32\u7c7b\u9898\u76ee\u9891\u7e41\u51fa\u73b0\u542b\u7a7a\u683c\u7684\u6574\u884c\u8f93\u5165&#xff0c;\u4ec5\u7528 cin \u8bfb\u53d6\u4f1a\u56e0\u7a7a\u683c\u622a\u65ad\u5bfc\u81f4\u903b\u8f91\u5b8c\u5168\u9519\u8bef\u3002\u672c\u6b21 L1-6 \u6211\u5c31\u8e29\u4e86\u8fd9\u4e2a\u5751&#xff0c;\u5361\u4e86\u8fd1 20 \u5206\u949f\u624d\u53cd\u5e94\u8fc7\u6765&#xff0c;\u6539\u7528 getline \u540e\u76f4\u63a5\u901a\u8fc7\u3002 \u5907\u8d5b\u9636\u6bb5\u4e00\u5b9a\u8981\u719f\u7ec3\u638c\u63e1 getline \u7684\u7528\u6cd5&#xff0c;\u4ee5\u53ca\u5b83\u4e0e cin \u6df7\u7528\u65f6\u7684\u6362\u884c\u7b26\u6b8b\u7559\u5904\u7406cin.ignore()&#xff0c;\u8fd9\u662f L1-L2 \u90fd\u9ad8\u9891\u51fa\u73b0\u7684\u8003\u70b9\u3002<\/p>\n<hr \/>\n<h3>L1 \u9898\u76ee\u590d\u76d8\u4e0e\u8003\u70b9\u603b\u7ed3<\/h3>\n<p>L1 \u6574\u4f53\u4ee5\u57fa\u7840\u8bed\u6cd5\u548c\u7b80\u5355\u6a21\u62df\u4e3a\u4e3b&#xff0c;\u96be\u5ea6\u504f\u4f4e&#xff0c;\u8fd9\u91cc\u4ec5\u63d0\u70bc\u9700\u8981\u6ce8\u610f\u7684\u9898\u76ee\u4e0e\u8003\u70b9&#xff1a;<\/p>\n<p>L1-1 ~ L1-5&#xff1a;\u5747\u4e3a\u57fa\u7840\u9001\u5206\u9898&#xff0c;\u8003\u5bdf\u57fa\u672c\u8f93\u5165\u8f93\u51fa\u3001\u7b80\u5355\u8fd0\u7b97\u4e0e\u57fa\u7840\u903b\u8f91&#xff0c;\u6b63\u5e38\u5907\u8d5b\u90fd\u80fd\u5feb\u901f\u901a\u5173\u3002 \u65e0\u4ee3\u7801 L1-6&#xff1a;\u5b57\u7b26\u4e32\u8f93\u5165\u6613\u9519\u9898&#xff0c;\u6838\u5fc3\u5751\u70b9\u662f\u542b\u7a7a\u683c\u7684\u6574\u884c\u8f93\u5165\u5904\u7406&#xff0c;\u719f\u7ec3\u4f7f\u7528 getline \u5373\u53ef\u5feb\u901f\u89e3\u51b3\u3002 \u6b63\u89e3<\/p>\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 macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">int<\/span> <span class=\"token expression\"><span class=\"token keyword\">long<\/span> <span class=\"token keyword\">long<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">signed<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    string s<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> t<span class=\"token operator\">&#061;<\/span><span class=\"token number\">11<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">getline<\/span><span class=\"token punctuation\">(<\/span>cin<span class=\"token punctuation\">,<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cout<span class=\"token operator\">&lt;&lt;<\/span>s<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 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<p>L1-7&#xff1a;\u7eaf\u6a21\u62df\u9001\u5206\u9898&#xff0c;\u4e25\u683c\u6309\u7167\u9898\u76ee\u63cf\u8ff0\u7684\u6b65\u9aa4\u5b9e\u73b0\u5373\u53ef&#xff0c;\u4e0d\u6d89\u53ca\u590d\u6742\u7b97\u6cd5\u3002 \u6b63\u89e3<\/p>\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 macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">int<\/span> <span class=\"token expression\"><span class=\"token keyword\">long<\/span> <span class=\"token keyword\">long<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">signed<\/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 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>   vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">a<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">long<\/span> <span class=\"token keyword\">long<\/span> sum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> ma <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> mi <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1e7<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>   <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> n<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n       cin <span class=\"token operator\">&gt;&gt;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n       sum <span class=\"token operator\">&#043;&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n       ma <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>ma <span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n       mi <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>mi <span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>   <span class=\"token punctuation\">}<\/span><\/p>\n<p>   <span class=\"token keyword\">int<\/span> avg <span class=\"token operator\">&#061;<\/span> sum <span class=\"token operator\">\/<\/span> n<span class=\"token punctuation\">;<\/span>    <\/p>\n<p>   vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> ans<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> n<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n       <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&gt;<\/span>avg<span class=\"token operator\">*<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span>ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><\/p>\n<p>   <span class=\"token comment\">\/\/ \u7b2c\u4e00\u884c&#xff1a;\u6700\u5927\u503c\u3001\u6700\u5c0f\u503c\u3001\u5e73\u5747\u503c<\/span><br \/>\n   cout <span class=\"token operator\">&lt;&lt;<\/span> ma <span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039; &#039;<\/span><span class=\"token operator\">&lt;&lt;<\/span> mi <span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039; &#039;<\/span><span class=\"token operator\">&lt;&lt;<\/span> avg <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>   <span class=\"token comment\">\/\/ \u7b2c\u4e8c\u884c<\/span><br \/>\n   <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n       cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Normal\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token punctuation\">}<\/span><br \/>\n   <span class=\"token keyword\">else<\/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><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span>ans<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> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n           <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> cout <span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039; &#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n           cout <span class=\"token operator\">&lt;&lt;<\/span> ans<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n       <span class=\"token punctuation\">}<\/span><br \/>\n       cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039;\\\\n&#039;<\/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<p>L1-8&#xff1a;\u5b57\u7b26\u4e32\u64cd\u4f5c\u9898&#xff0c;\u8003\u70b9\u4e0e\u53bb\u5e74 L1 \u7684\u4e00\u9053\u771f\u9898\u5b8c\u5168\u91cd\u5408&#xff0c;\u96be\u5ea6\u751a\u81f3\u66f4\u4f4e&#xff1b;\u5728\u5b98\u65b9\u51c6\u8003\u8bc1\u5bf9\u5e94\u7684\u6a21\u62df\u8d5b\u4e2dl1-8\u9898\u76ee\u4e2d\u660e\u786e\u8bf4\u660el1-8\u5c06\u8981\u8003\u53bb\u5e74\u4e00\u6837\u7684\u5b57\u7b26\u4e32\u8003\u70b9\u3002\u6838\u5fc3\u8003\u5bdf\u5b57\u7b26\u4e32\u7684\u63d2\u5165\u3001\u67e5\u627e\u3001\u7ffb\u8f6c\u4e0e substr \u622a\u53d6\u51fd\u6570&#xff0c;\u8d5b\u524d\u5237\u8fc7\u5386\u5e74\u9898\u3001\u8ba4\u771f\u6253\u6a21\u62df\u8d5b\u7684\u8bdd&#xff0c;\u8fd9\u9053\u9898\u5c5e\u4e8e\u5fc5\u62ff\u5206\u3002 \u6b63\u89e3<\/p>\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><br \/>\nstring s<span class=\"token punctuation\">;<\/span><br \/>\n<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 keyword\">int<\/span> n<span class=\"token punctuation\">,<\/span>op<span class=\"token punctuation\">,<\/span>len<span class=\"token punctuation\">;<\/span><br \/>\n    cin<span class=\"token operator\">&gt;&gt;<\/span>n<span class=\"token operator\">&gt;&gt;<\/span>s<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>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        cin<span class=\"token operator\">&gt;&gt;<\/span>op<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>op<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            string s1<span class=\"token punctuation\">;<\/span><br \/>\n            cin<span class=\"token operator\">&gt;&gt;<\/span>s1<span class=\"token punctuation\">;<\/span><br \/>\n            len<span class=\"token operator\">&#061;<\/span>s1<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#061;&#061;<\/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                cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> cnt<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span>ans<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\">&#043;<\/span>len<span class=\"token operator\">&lt;&#061;<\/span>s<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>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>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#061;&#061;<\/span>s1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                    cnt<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cnt<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token keyword\">break<\/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\">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>cnt<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>i<span class=\"token punctuation\">)<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039; &#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                cout<span class=\"token operator\">&lt;&lt;<\/span>ans<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>op<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> p<span class=\"token punctuation\">;<\/span><br \/>\n            string s2<span class=\"token punctuation\">;<\/span><br \/>\n            cin<span class=\"token operator\">&gt;&gt;<\/span>p<span class=\"token operator\">&gt;&gt;<\/span>s2<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token operator\">&#061;&#061;<\/span>s<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>s<span class=\"token operator\">&#043;&#061;<\/span>s2<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                string tmp<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                tmp<span class=\"token operator\">&#043;&#061;<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                tmp<span class=\"token operator\">&#043;&#061;<\/span>s2<span class=\"token punctuation\">;<\/span><br \/>\n                tmp<span class=\"token operator\">&#043;&#061;<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                s<span class=\"token operator\">&#061;<\/span>tmp<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            cout<span class=\"token operator\">&lt;&lt;<\/span>s<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> l<span class=\"token punctuation\">,<\/span>r<span class=\"token punctuation\">;<\/span><br \/>\n            cin<span class=\"token operator\">&gt;&gt;<\/span>l<span class=\"token operator\">&gt;&gt;<\/span>r<span class=\"token punctuation\">;<\/span><br \/>\n            string tmp<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span>s2<span class=\"token punctuation\">;<\/span><br \/>\n            tmp<span class=\"token operator\">&#043;&#061;<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>l<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            s2<span class=\"token operator\">&#061;<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>l<span class=\"token punctuation\">,<\/span>r<span class=\"token operator\">&#8211;<\/span>l<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">reverse<\/span><span class=\"token punctuation\">(<\/span>s2<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>s2<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            tmp<span class=\"token operator\">&#043;&#061;<\/span>s2<span class=\"token punctuation\">;<\/span><br \/>\n            tmp<span class=\"token operator\">&#043;&#061;<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>r<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            s<span class=\"token operator\">&#061;<\/span>tmp<span class=\"token punctuation\">;<\/span><br \/>\n            cout<span class=\"token operator\">&lt;&lt;<\/span>s<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/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\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>L2 \u9898\u76ee\u8be6\u89e3&#xff08;\u91cd\u70b9&#xff09;<\/h3>\n<p>L2 \u662f\u5929\u68af\u8d5b\u62c9\u5f00\u5206\u5dee\u7684\u6838\u5fc3\u533a\u95f4&#xff0c;\u4e5f\u662f\u5907\u8d5b\u7684\u91cd\u4e2d\u4e4b\u91cd&#xff0c;\u4e0b\u9762\u9010\u9898\u62c6\u89e3\u89e3\u9898\u601d\u8def\u3001\u8003\u573a\u5b9e\u6218\u4e0e\u8e29\u5751\u70b9&#xff1a;<\/p>\n<h4>L2-1 \u6808\u6a21\u62df\u5927\u9898<\/h4>\n<p>\u8fd9\u9053\u9898\u662f\u6211\u4e2a\u4eba\u8ba4\u4e3a\u672c\u6b21 L2 \u4e2d\u7f16\u7801\u590d\u6742\u5ea6\u6700\u9ad8\u7684\u4e00\u9898&#xff0c;\u5c5e\u4e8e\u601d\u8def\u7b80\u5355\u3001\u4ee3\u7801\u96be\u5b9e\u73b0\u9898\u3002<\/p>\n<p>\u8003\u70b9\u9884\u5224&#xff1a;\u5386\u5e74 L2 \u4e2d\u6808\u7684\u8003\u5bdf\u9891\u7387\u6781\u9ad8&#xff0c;\u8bfb\u5b8c\u9898\u76ee\u903b\u8f91\u540e\u6211\u7b2c\u4e00\u65f6\u95f4\u786e\u5b9a\u7528\u6808\u5b9e\u73b0&#xff0c;\u601d\u8def\u65b9\u5411\u5b8c\u5168\u6b63\u786e\u3002 \u5b9e\u6218\u60c5\u51b5&#xff1a;\u5b9e\u9645\u7f16\u7801 &#043; \u8c03\u8bd5\u82b1\u8d39\u4e86 1 \u4e2a\u591a\u5c0f\u65f6&#xff0c;\u9898\u76ee\u7ec6\u8282\u548c\u8fb9\u754c\u6761\u4ef6\u975e\u5e38\u591a&#xff0c;\u53cd\u590d\u8c03\u8bd5\u540e\u4ecd\u6709\u5c11\u91cf\u6d4b\u8bd5\u7528\u4f8b\u672a\u901a\u8fc7&#xff0c;\u6700\u7ec8\u5361\u70b9\u5931\u5206\u3002 \u5907\u8003\u5efa\u8bae&#xff1a;\u8fd9\u7c7b\u5927\u6a21\u62df\u9898\u6ca1\u6709\u6377\u5f84&#xff0c;\u53ea\u80fd\u9760\u5e73\u65f6\u591a\u5237\u540c\u7c7b\u578b\u9898\u76ee&#xff0c;\u79ef\u7d2f\u8fb9\u754c\u5904\u7406\u7ecf\u9a8c&#xff0c;\u63d0\u5347\u4ee3\u7801\u4e00\u6b21\u6210\u578b\u7684\u51c6\u786e\u5ea6&#xff0c;\u907f\u514d\u5728\u8003\u573a\u4e0a\u6d88\u8017\u8fc7\u591a\u8c03\u8bd5\u65f6\u95f4&#xff0c;\u6324\u538b\u540e\u9762\u9898\u76ee\u7684\u4f5c\u7b54\u7a7a\u95f4\u3002 \u6b63\u89e3<\/p>\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 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 keyword\">int<\/span> n<span class=\"token punctuation\">,<\/span> T<span class=\"token punctuation\">;<\/span><br \/>\n    cin <span class=\"token operator\">&gt;&gt;<\/span> n <span class=\"token operator\">&gt;&gt;<\/span> T<span class=\"token punctuation\">;<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">c<\/span><span class=\"token punctuation\">(<\/span>n<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> n<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> cin <span class=\"token operator\">&gt;&gt;<\/span> c<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7528vector\u6a21\u62df\u6808&#xff0c;\u521d\u59cb\u6309\u81ea\u9876\u5411\u4e0b\u987a\u5e8f\u538b\u5165&#xff08;\u7f16\u53f71\u5728\u6700\u4e0a\u9762&#xff09;<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>pair<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;&gt;<\/span> v<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ {\u6df7\u4e71\u6307\u6570, \u7f16\u53f7}<\/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> n <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#8212;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        v<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>c<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    vector<span class=\"token operator\">&lt;<\/span>pair<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;&gt;<\/span> left<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e34\u65f6\u5b58\u653e\u6df7\u4e71\u6307\u6570 &gt; T \u7684\u4f5c\u4e1a<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> ans<span class=\"token punctuation\">;<\/span>             <span class=\"token comment\">\/\/ \u6279\u6539\u987a\u5e8f<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>v<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token operator\">!<\/span>left<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/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 comment\">\/\/ \u6279\u6539\u5f53\u524d\u5806<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>v<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/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\">auto<\/span> <span class=\"token punctuation\">[<\/span>val<span class=\"token punctuation\">,<\/span> idx<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            v<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop_back<\/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>val <span class=\"token operator\">&gt;<\/span> T<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                left<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>val<span class=\"token punctuation\">,<\/span> idx<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                ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>idx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5f53\u524d\u5806\u4e3a\u7a7a&#xff0c;\u68c0\u67e5\u5de6\u624b\u8fb9\u662f\u5426\u6709\u4f5c\u4e1a<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>left<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u66f4\u65b0\u9608\u503c\u4e3a\u5de6\u624b\u8fb9\u6df7\u4e71\u6307\u6570\u7684\u5e73\u5747\u503c&#xff08;\u5411\u4e0b\u53d6\u6574&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> sum <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\">auto<\/span> p <span class=\"token operator\">:<\/span> left<span class=\"token punctuation\">)<\/span> sum <span class=\"token operator\">&#043;&#061;<\/span> p<span class=\"token punctuation\">.<\/span>first<span class=\"token punctuation\">;<\/span><br \/>\n        T <span class=\"token operator\">&#061;<\/span> sum <span class=\"token operator\">\/<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span>left<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><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5c06\u5de6\u624b\u8fb9\u5806\u8f6c\u4e3a\u5f53\u524d\u5806<\/span><br \/>\n        v <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>left<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        left<span class=\"token punctuation\">.<\/span><span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8f93\u51fa\u6279\u6539\u987a\u5e8f<\/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><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">(<\/span>ans<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><span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039; &#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cout <span class=\"token operator\">&lt;&lt;<\/span> ans<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> endl<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<h4>L2-2 \u679a\u4e3e &#043; \u4e8c\u5206\u67e5\u8be2\u9898<\/h4>\n<p>\u6807\u51c6\u9001\u5206\u9898&#xff0c;\u96be\u5ea6\u5f88\u4f4e&#xff0c;\u6838\u5fc3\u662f\u7528\u9884\u5904\u7406\u4f18\u5316\u67e5\u8be2\u6548\u7387&#xff1a;<\/p>\n<li>\u9898\u610f\u4e3a\u6c42\u53d6\u6240\u6709\u6027\u80fd\u5f97\u5206\u6700\u9ad8\u7684\u53c2\u6570\u7ec4\u5408\u7f16\u53f7&#xff0c;\u76f4\u63a5\u66b4\u529b\u679a\u4e3e\u6240\u6709\u7ec4\u5408\u5373\u53ef\u5f97\u5230\u7ed3\u679c&#xff1b;<\/li>\n<li>\u4f18\u5316\u601d\u8def&#xff1a;\u67e5\u8be2\u524d\u5148\u7528\u6570\u7ec4\u9884\u5904\u7406\u8bb0\u5f55\u6bcf\u4e2a\u6570\u503c\u51fa\u73b0\u7684\u6700\u5c0f\u4e0b\u6807&#xff1b;<\/li>\n<li>\u5c06\u6570\u7ec4\u6392\u5e8f\u540e&#xff0c;\u76f4\u63a5\u4f7f\u7528 upper_bound \u51fd\u6570\u5373\u53ef\u5feb\u901f\u5b8c\u6210\u67e5\u8be2&#xff0c;\u4ee3\u7801\u91cf\u5c0f\u4e14\u4e0d\u6613\u51fa\u9519\u3002<\/li>\n<li>\u6b63\u89e3<\/li>\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 keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <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>    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">a<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> v<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u4e2d\u95f4\u503c&#xff1a;\u5b58\u50a8\u6240\u6709\u5206\u6570&#xff0c;\u6392\u5e8f\u53bb\u91cd\u540e\u7528\u4e8e\u4e8c\u5206\u67e5\u627e<\/span><br \/>\n    map<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> d<span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ \u6bcf\u79cd\u5206\u6570\u5bf9\u5e94\u7684\u6700\u5c0f\u7f16\u53f7<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> mx <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <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> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        cin <span class=\"token operator\">&gt;&gt;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        mx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>mx<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        v<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u540c\u4e00\u79cd\u5206\u6570\u4fdd\u7559\u6700\u5c0f\u7f16\u53f7<\/span><br \/>\n        d<span class=\"token punctuation\">.<\/span><span class=\"token function\">emplace<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b2c\u4e00\u884c&#xff1a;\u8f93\u51fa\u6240\u6709\u6700\u9ad8\u5206\u5bf9\u5e94\u7684\u7f16\u53f7<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> first <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/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> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> mx<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>first<span class=\"token punctuation\">)<\/span> cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039; &#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            cout <span class=\"token operator\">&lt;&lt;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n            first <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    cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6392\u5e8f\u53bb\u91cd&#xff0c;\u7528\u4e8e upper_bound \u67e5\u627e<\/span><br \/>\n    <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    v<span class=\"token punctuation\">.<\/span><span class=\"token function\">erase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">unique<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> m<span class=\"token punctuation\">;<\/span><br \/>\n    cin <span class=\"token operator\">&gt;&gt;<\/span> m<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>m<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n        cin <span class=\"token operator\">&gt;&gt;<\/span> x<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">auto<\/span> it <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">upper_bound<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>it <span class=\"token operator\">&#061;&#061;<\/span> v<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u6837\u4f8b\u4e2d\u65e0\u89e3\u8f93\u51fa 0<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            cout <span class=\"token operator\">&lt;&lt;<\/span> d<span class=\"token punctuation\">[<\/span><span class=\"token operator\">*<\/span>it<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token char\">&#039;\\\\n&#039;<\/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\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>L2-3 \u6811\u7684 DFS \u6700\u5927\u8def\u5f84\u6700\u5c0f\u503c<\/h4>\n<p>\u672c\u9898\u9898\u5e72\u63cf\u8ff0\u975e\u5e38\u7ed5&#xff0c;\u76f4\u63a5\u901a\u8bfb\u5f88\u5bb9\u6613\u88ab\u8ff7\u60d1&#xff0c;\u63a8\u8350\u300c\u5148\u770b\u6837\u4f8b\u3001\u753b\u56fe\u63a8\u5bfc\u300d\u7684\u65b9\u5f0f\u5feb\u901f\u7834\u9898\u3002<\/p>\n<p>\u9898\u610f\u8f6c\u5316 &#043; \u6837\u4f8b\u63a8\u5bfc<\/p>\n<p>\u9898\u76ee\u4e2d\u7684\u300c\u5b9d\u85cf\u5730\u300d\u672c\u8d28\u5c31\u662f\u6811\u7684\u53f6\u5b50\u8282\u70b9\u3002\u4ee5\u6837\u4f8b\u4e3a\u4f8b&#xff0c;\u5171 4 \u4e2a\u53f6\u5b50\u8282\u70b9&#xff08;\u5b9d\u85cf\u5730&#xff09;&#xff0c;\u4ece\u6839\u8282\u70b9 0 \u51fa\u53d1\u5230\u5404\u53f6\u5b50\u7684\u8def\u5f84&#xff0c;\u4ee5\u53ca\u8def\u5f84\u4e0a\u7684\u6700\u5c0f\u8fb9\u6743\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\u8def\u5f84 0\u21923&#xff1a;\u8def\u5f84\u4e0a\u7684\u6700\u5c0f\u8fb9\u6743\u4e3a 0<\/li>\n<li>\u8def\u5f84 0\u21922\u21926&#xff1a;\u8def\u5f84\u4e0a\u7684\u6700\u5c0f\u8fb9\u6743\u4e3a 10<\/li>\n<li>\u8def\u5f84 0\u21921\u21925\u21928&#xff1a;\u8def\u5f84\u4e0a\u7684\u6700\u5c0f\u8fb9\u6743\u4e3a 10<\/li>\n<li>\u8def\u5f84 0\u21921\u21924\u21927&#xff1a;\u8def\u5f84\u4e0a\u7684\u6700\u5c0f\u8fb9\u6743\u4e3a 8<\/li>\n<\/ul>\n<p>\u9898\u76ee\u8981\u6c42\u7684\u300c\u6700\u5927\u7684\u6700\u5c0f\u503c\u300d&#xff0c;\u5c31\u662f\u5728\u6240\u6709\u53f6\u5b50\u8282\u70b9\u7684\u8def\u5f84\u6700\u5c0f\u503c\u4e2d\u53d6\u6700\u5927\u503c&#xff0c;\u5bf9\u5e94\u6837\u4f8b\u7b54\u6848\u4e3a 10\u3002 \u89e3\u6cd5\u601d\u8def<\/p>\n<p>\u7528 DFS \u904d\u5386\u6574\u68f5\u6811&#xff0c;\u540c\u6b65\u7ef4\u62a4\u4e00\u4e2a\u8f85\u52a9\u6570\u7ec4 \/ \u53d8\u91cf&#xff0c;\u8bb0\u5f55\u4ece\u6839\u8282\u70b9 0 \u5230\u8fbe\u5f53\u524d\u8282\u70b9\u7684\u8fc7\u7a0b\u4e2d&#xff0c;\u8def\u5f84\u4e0a\u7684\u6700\u5c0f\u8fb9\u6743&#xff1b;\u904d\u5386\u5b8c\u6210\u540e&#xff0c;\u679a\u4e3e\u6240\u6709\u53f6\u5b50\u8282\u70b9\u5bf9\u5e94\u7684\u6700\u5c0f\u503c&#xff0c;\u53d6\u5176\u4e2d\u6700\u5927\u503c\u5373\u4e3a\u7b54\u6848\u3002 \u6574\u4f53\u903b\u8f91\u975e\u5e38\u6e05\u6670&#xff0c;\u5c5e\u4e8e\u300c\u770b\u61c2\u9898\u610f\u5c31\u4f1a\u505a\u300d\u7684\u9898\u76ee&#xff0c;\u5173\u952e\u662f\u4e0d\u8981\u88ab\u5197\u957f\u7684\u9898\u5e72\u529d\u9000&#xff0c;\u7ed3\u5408\u6837\u4f8b\u753b\u56fe\u62c6\u89e3\u662f\u6700\u9ad8\u6548\u7684\u7834\u9898\u65b9\u5f0f\u3002 \u6b63\u89e3<\/p>\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><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> N <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1e5<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span>pair<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;&gt;<\/span> g<span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> now<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fa<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> mi<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    a<span class=\"token punctuation\">[<\/span>now<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span>mi<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> <span class=\"token punctuation\">[<\/span>nt<span class=\"token punctuation\">,<\/span>w<span class=\"token punctuation\">]<\/span><span class=\"token operator\">:<\/span> g<span class=\"token punctuation\">[<\/span>now<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>nt<span class=\"token operator\">!&#061;<\/span>fa<span class=\"token punctuation\">)<\/span><span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>nt<span class=\"token punctuation\">,<\/span>now<span class=\"token punctuation\">,<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>mi<span class=\"token punctuation\">,<\/span>w<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><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 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><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;<\/span> n <span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> fa<span class=\"token punctuation\">,<\/span> w<span class=\"token punctuation\">;<\/span><br \/>\n        cin <span class=\"token operator\">&gt;&gt;<\/span> fa <span class=\"token operator\">&gt;&gt;<\/span> w<span class=\"token punctuation\">;<\/span><br \/>\n        g<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>fa<span class=\"token punctuation\">,<\/span>w<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        g<span class=\"token punctuation\">[<\/span>fa<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>i<span class=\"token punctuation\">,<\/span>w<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 comment\">\/\/\u6743\u503c\u6700\u5927\u4e3a100 110\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><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 number\">110<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> ans <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/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;<\/span> n <span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>g<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span>ans<span class=\"token operator\">&#061;<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">,<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span>res<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;<\/span> n <span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>g<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&amp;&amp;<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;&#061;<\/span>ans<span class=\"token punctuation\">)<\/span><br \/>\n        res<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>res<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cout<span class=\"token operator\">&lt;&lt;<\/span>ans<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/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><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">(<\/span>res<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><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>i<span class=\"token punctuation\">)<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039; &#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cout<span class=\"token operator\">&lt;&lt;<\/span>res<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/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<h4>L2-4 \u6392\u5e8f &#043; DFS \u9898<\/h4>\n<p>\u8fd9\u9053\u9898\u6211\u53d1\u6325\u5931\u8bef&#xff0c;\u8003\u8bd5\u53ea\u5269 20 \u5206\u949f\u624d\u5f00\u59cb\u4f5c\u7b54&#xff0c;\u5fc3\u6001\u6025\u8e81\u5bfc\u81f4\u51fa\u73b0\u6bb5\u9519\u8bef&#xff0c;\u6700\u7ec8\u6ca1\u80fd\u8c03\u8bd5\u901a\u8fc7&#xff0c;\u975e\u5e38\u53ef\u60dc\u3002<\/p>\n<p>\u6838\u5fc3\u601d\u8def&#xff1a;\u7528 vector \u5d4c\u5957\u7ed3\u6784\u4f53\u5b58\u50a8\u6570\u636e&#xff0c;\u5148\u6309\u7167\u9898\u76ee\u8981\u6c42\u7684\u89c4\u5219\u6392\u5e8f&#xff0c;\u518d\u7528 DFS \u904d\u5386\u641c\u7d22\u7b26\u5408\u6761\u4ef6\u7684\u7ed3\u679c\u5373\u53ef&#xff0c;\u5c5e\u4e8e L2 \u7684\u5e38\u89c4\u8003\u6cd5\u3002 \u8e29\u5751\u63d0\u9192&#xff1a;DFS \u7c7b\u9898\u76ee\u4e00\u5b9a\u8981\u6ce8\u610f\u6570\u7ec4\u8fb9\u754c\u3001\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6&#xff0c;\u65f6\u95f4\u8d8a\u7d27\u5f20\u8d8a\u5bb9\u6613\u51fa\u73b0\u8d8a\u754c\u3001\u6f0f\u5224\u65ad\u7b49\u4f4e\u7ea7\u9519\u8bef\u3002 \u6b63\u89e3<\/p>\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><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> N<span class=\"token operator\">&#061;<\/span><span class=\"token number\">10010<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> vis<span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">nd<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> nt<span class=\"token punctuation\">,<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token function\">cmp<\/span><span class=\"token punctuation\">(<\/span>nd n1<span class=\"token punctuation\">,<\/span>nd n2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n1<span class=\"token punctuation\">.<\/span>p<span class=\"token operator\">!&#061;<\/span>n2<span class=\"token punctuation\">.<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">return<\/span> n1<span class=\"token punctuation\">.<\/span>p<span class=\"token operator\">&gt;<\/span>n2<span class=\"token punctuation\">.<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> n1<span class=\"token punctuation\">.<\/span>nt<span class=\"token operator\">&lt;<\/span>n2<span class=\"token punctuation\">.<\/span>nt<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span>nd<span class=\"token operator\">&gt;<\/span>g<span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span>ans<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> n<span class=\"token punctuation\">,<\/span>m<span class=\"token punctuation\">,<\/span>k<span class=\"token punctuation\">,<\/span>t<span class=\"token punctuation\">;<\/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> now<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>now<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\">auto<\/span> <span class=\"token punctuation\">[<\/span>nt<span class=\"token punctuation\">,<\/span>p<span class=\"token punctuation\">]<\/span><span class=\"token operator\">:<\/span>g<span class=\"token punctuation\">[<\/span>now<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><span class=\"token operator\">!<\/span>vis<span class=\"token punctuation\">[<\/span>nt<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            vis<span class=\"token punctuation\">[<\/span>nt<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>nt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/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<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    cin<span class=\"token operator\">&gt;&gt;<\/span>n<span class=\"token operator\">&gt;&gt;<\/span>m<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>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\">int<\/span> u<span class=\"token punctuation\">,<\/span>v<span class=\"token punctuation\">,<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n        cin<span class=\"token operator\">&gt;&gt;<\/span>u<span class=\"token operator\">&gt;&gt;<\/span>v<span class=\"token operator\">&gt;&gt;<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n        g<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>v<span class=\"token punctuation\">,<\/span>p<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><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        <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>g<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>g<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>cmp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    cin<span class=\"token operator\">&gt;&gt;<\/span>k<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>k<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>vis<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">sizeof<\/span> vis<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cin<span class=\"token operator\">&gt;&gt;<\/span>st<span class=\"token punctuation\">;<\/span><br \/>\n        vis<span class=\"token punctuation\">[<\/span>st<span 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