{"id":85348,"date":"2026-07-27T13:00:52","date_gmt":"2026-07-27T05:00:52","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/85348.html"},"modified":"2026-07-27T13:00:52","modified_gmt":"2026-07-27T05:00:52","slug":"2025-%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\/85348.html","title":{"rendered":"2025 \u5e74 PTA \u56e2\u4f53\u7a0b\u5e8f\u8bbe\u8ba1\u5929\u68af\u8d5b \u9898\u89e3\u590d\u76d8\u4e0e\u5907\u8d5b\u7ecf\u9a8c"},"content":{"rendered":"<p>\u8fd9\u662f\u6211\u9996\u6b21\u53c2\u52a0\u5929\u68af\u8d5b\u7684\u5b8c\u6574\u590d\u76d8&#xff0c;\u5f53\u65f6\u7b97\u6cd5\u57fa\u7840\u5c1a\u8584\u5f31&#xff0c;\u89e3\u9898\u8282\u594f\u504f\u6162&#xff0c;\u52a0\u4e0a\u5f53\u5e74 L1 \u96be\u5ea6\u6574\u4f53\u9ad8\u4e8e 2026 \u5e74&#xff0c;\u6700\u7ec8 L1 \u6709 1 \u9898\u672a\u5b8c\u6210\u30012 \u9898\u9760\u66b4\u529b\u89e3\u6cd5\u62ff\u90e8\u5206\u5206&#xff1b;L2 \u4ec5 2 \u9898\u901a\u8fc7\u66b4\u529b\u4e0e\u7279\u5224\u62ff\u5230\u5c11\u91cf\u5206\u6570&#xff0c;\u5176\u4f59\u9898\u76ee0\u5206&#xff0c;\u6700\u7ec8\u603b\u5206 107 \u5206\u3002\u4f5c\u4e3a\u9996\u6218\u6210\u7ee9&#xff0c;\u5f53\u65f6\u5df2\u8fbe\u5230\u81ea\u5df1\u7684\u9884\u671f\u3002 2026 \u5e74\u6211\u7b2c\u4e8c\u6b21\u53c2\u8d5b&#xff0c;\u6700\u7ec8\u83b7\u5f97 172 \u5206\u3001\u56e2\u4f53\u56fd\u5bb6\u7ea7\u4e09\u7b49\u5956\u3002\u5173\u4e8e 2026 \u5e74\u7684\u8be6\u7ec6\u9898\u89e3\u4e0e\u5907\u8d5b\u8def\u7ebf&#xff0c;\u53ef\u53c2\u8003\u6211\u7684\u53e6\u4e00\u7bc7\u535a\u5ba2&#xff1b;<\/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&#xff08;25\u5e74\u6ca1\u8003&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>L1 \u9898\u76ee\u590d\u76d8\u4e0e\u8003\u70b9\u603b\u7ed3<\/li>\n<li>\n<ul>\n<li>L1-6\u8fd9\u4e0d\u662f\u5b57\u7b26\u4e32\u9898<\/li>\n<li>L1-7\u5927\u5e42\u6570<\/li>\n<li>L1-8\u73b0\u4ee3\u6218\u4e89<\/li>\n<\/ul>\n<\/li>\n<li>L2 \u9898\u76ee\u8be6\u89e3&#xff08;\u91cd\u70b9&#xff09;<\/li>\n<li>\n<ul>\n<li>L2-1 \u7b97\u5f0f\u62c6\u89e3<\/li>\n<li>L2-2 \u4e09\u70b9\u5171\u7ebf<\/li>\n<li>L2-3 \u80d6\u8fbe\u7684\u5c71\u5934<\/li>\n<li>L2-4 \u88abn\u6574\u9664\u7684n\u4f4d\u6570<\/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&#xff08;25\u5e74\u6ca1\u8003&#xff09;<\/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\u3001\u7b80\u5355\u6a21\u62df\u4e3a\u6838\u5fc3&#xff0c;\u96be\u5ea6\u504f\u4f4e\u3002<\/p>\n<p>L1-1 ~ L1-3&#xff1a;\u9001\u5206\u9898&#xff0c;\u6b63\u5e38\u5907\u8d5b\u90fd\u80fd\u5feb\u901f\u901a\u5173\u3002 \u65e0\u4ee3\u7801 L1-4:\u6309\u9898\u76ee\u8981\u6c42\u505a\u5c31\u884c<\/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\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">]<\/span><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><br \/>\n   a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><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 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><span class=\"token number\">32<\/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       a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">2<\/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\">31<\/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>i<span class=\"token operator\">&#8212;<\/span><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\">&lt;&#061;<\/span>n<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><br \/>\n           <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/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<p>L1-5:\u6309\u9898\u76ee\u8981\u6c42\u505a\u5c31\u884c<\/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\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">27<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>ans<span class=\"token punctuation\">,<\/span>cnt<span class=\"token punctuation\">[<\/span><span class=\"token number\">27<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstring s<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   cin<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\">1<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;&#061;<\/span><span class=\"token number\">26<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span>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   <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>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\">char<\/span> c<span class=\"token operator\">&#061;<\/span>s<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n       cnt<span class=\"token punctuation\">[<\/span>c<span class=\"token operator\">&#8211;<\/span><span class=\"token char\">&#039;a&#039;<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n       ans<span class=\"token operator\">&#043;&#061;<\/span>a<span class=\"token punctuation\">[<\/span>c<span class=\"token operator\">&#8211;<\/span><span class=\"token char\">&#039;a&#039;<\/span><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><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><span class=\"token number\">26<\/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 operator\">&gt;<\/span><span class=\"token number\">1<\/span><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>cnt<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 operator\">&lt;&lt;<\/span>ans<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>L1-6\u8fd9\u4e0d\u662f\u5b57\u7b26\u4e32\u9898<\/h4>\n<p>\u8fd9\u9053\u9898\u5177\u6709\u8f83\u5f3a\u7684\u8ff7\u60d1\u6027&#xff0c;\u8868\u9762\u770b\u4f3c\u975e\u5b57\u7b26\u4e32\u9898\u578b&#xff0c;\u672c\u8d28\u4ecd\u662f\u7ecf\u5178\u5b57\u7b26\u4e32\u64cd\u4f5c\u9898\u3002\u6211\u5f53\u65f6\u88ab\u9898\u76ee\u6b3a\u9a97&#xff0c;\u6ca1\u6709\u5f80\u8f6c\u5b57\u7b26\u4e32\u8fd9\u65b9\u9762\u8003\u8651\u3002<\/p>\n<p>\u601d\u8def\u662f\u505a\u8f6c\u6362&#xff1a;\u5c06\u6570\u5b57\u6620\u5c04\u4e3a\u5b57\u6bcd&#xff0c;\u628a\u6570\u503c\u6570\u7ec4\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u540e&#xff0c;\u5373\u53ef\u7528\u5b57\u7b26\u4e32\u64cd\u4f5c\u5b8c\u6210\u9898\u76ee\u8981\u6c42&#xff0c;\u6700\u7ec8\u518d\u6620\u5c04\u56de\u6570\u5b57\u5f62\u5f0f\u3002 \u6838\u5fc3\u8003\u70b9\u8986\u76d6\u5b57\u7b26\u4e32\u4e09\u5927\u57fa\u7840\u64cd\u4f5c&#xff1a;\u7ffb\u8f6c&#xff08;reverse&#xff09;\u3001\u67e5\u627e&#xff08;find&#xff09;\u3001\u622a\u53d6&#xff08;substr&#xff09;\u300226\u5e74\u53c8\u8003\u4e86\u91cd\u590d\u8003\u70b9&#xff0c;\u5c5e\u4e8e\u5fc5\u4f1a\u9898 \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\">2e5<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">9<\/span><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>t<span class=\"token punctuation\">,<\/span>ans<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    cin<span class=\"token operator\">&gt;&gt;<\/span>n<span class=\"token operator\">&gt;&gt;<\/span>m<span class=\"token punctuation\">;<\/span><br \/>\n    s<span class=\"token operator\">&#043;&#061;<\/span><span class=\"token string\">&#034;&#034;<\/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>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> x<span class=\"token punctuation\">;<\/span><br \/>\n        cin<span class=\"token operator\">&gt;&gt;<\/span>x<span class=\"token punctuation\">;<\/span><br \/>\n        s<span class=\"token operator\">&#043;&#061;<\/span>x<span class=\"token operator\">&#043;<\/span><span class=\"token char\">&#039;a&#039;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>m<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> op<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><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> l1<span class=\"token punctuation\">,<\/span>l2<span class=\"token punctuation\">;<\/span><br \/>\n            string s1<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span>s2<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            cin<span class=\"token operator\">&gt;&gt;<\/span>l1<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>l1<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> x<span class=\"token punctuation\">;<\/span><br \/>\n                cin<span class=\"token operator\">&gt;&gt;<\/span>x<span class=\"token punctuation\">;<\/span><br \/>\n                s1<span class=\"token operator\">&#043;&#061;<\/span>x<span class=\"token operator\">&#043;<\/span><span class=\"token char\">&#039;a&#039;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            cin<span class=\"token operator\">&gt;&gt;<\/span>l2<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>l2<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> x<span class=\"token punctuation\">;<\/span><br \/>\n                cin<span class=\"token operator\">&gt;&gt;<\/span>x<span class=\"token punctuation\">;<\/span><br \/>\n                s2<span class=\"token operator\">&#043;&#061;<\/span>x<span class=\"token operator\">&#043;<\/span><span class=\"token char\">&#039;a&#039;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <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;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">int<\/span> pos<span class=\"token operator\">&#061;<\/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 punctuation\">;<\/span><br \/>\n                s<span class=\"token punctuation\">.<\/span><span class=\"token function\">replace<\/span><span class=\"token punctuation\">(<\/span>pos<span class=\"token punctuation\">,<\/span>l1<span class=\"token punctuation\">,<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">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            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 number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&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>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> x1<span class=\"token operator\">&#061;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;<\/span>s<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#8211;<\/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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>x1<span class=\"token operator\">%<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>tmp<span class=\"token operator\">&#043;&#061;<\/span><span class=\"token keyword\">char<\/span><span class=\"token punctuation\">(<\/span>x1<span class=\"token operator\">\/<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                tmp<span class=\"token operator\">&#043;&#061;<\/span>s<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            s<span class=\"token operator\">&#061;<\/span>tmp<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\">3<\/span><span class=\"token punctuation\">)<\/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>s1<span class=\"token punctuation\">,<\/span>s2<span class=\"token punctuation\">;<\/span><br \/>\n            s1<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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><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>s1<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>s1<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>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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            tmp<span class=\"token operator\">&#043;&#061;<\/span>s1<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 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    <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>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            cout<span class=\"token operator\">&lt;&lt;<\/span>s<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token char\">&#039;a&#039;<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token operator\">!&#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 operator\">&#8211;<\/span><span class=\"token number\">1<\/span><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        <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>L1-7\u5927\u5e42\u6570<\/h4>\n<p>\u6838\u5fc3\u89e3\u6cd5\u4e3a\u679a\u4e3e\u6b21\u5e42&#xff0c;\u53ef\u901a\u8fc7\u6570\u5b66\u63a8\u5bfc\u7f29\u5c0f\u679a\u4e3e\u8303\u56f4\u505a\u7b80\u5355\u4f18\u5316\u3002 \u9898\u76ee\u4e2d n \u7684\u4e0a\u9650\u4e0d\u8d85\u8fc7 2^31&#xff0c;\u56e0\u6b64\u5e42\u6b21\u679a\u4e3e\u5b58\u5728\u660e\u786e\u4e0a\u754c&#xff1a;\u5f53\u5e42\u6b21\u4e3a 1 \u65f6&#xff0c;\u7531\u6c42\u548c\u516c\u5f0f m*(m&#043;1)\/2 \u53ef\u4f30\u7b97&#xff0c;m \u53d6 2^15 \u65f6\u7ed3\u679c\u4ecd\u5c0f\u4e8e n \u4e0a\u9650&#xff0c;m \u53d6 2^16 \u65f6\u5219\u8d85\u51fa\u8303\u56f4&#xff0c;\u56e0\u6b64\u679a\u4e3e\u4e0a\u754c\u53ef\u8bbe\u4e3a 2^16\u3002\u540c\u65f6\u5728\u7d2f\u52a0\u8fc7\u7a0b\u4e2d&#xff0c;\u82e5\u5f53\u524d\u548c\u5df2\u8d85\u8fc7 n \u53ef\u76f4\u63a5\u7ec8\u6b62\u5faa\u73af&#xff0c;\u8fdb\u4e00\u6b65\u964d\u4f4e\u65f6\u95f4\u6d88\u8017\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\">1e6<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">9<\/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>ans<span class=\"token punctuation\">,<\/span>a<span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> mx1<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token number\">16<\/span><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 punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> ansk<span class=\"token punctuation\">,<\/span>ansmx<span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">bool<\/span> fd<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> 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>mx1<span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span>i<span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> k<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>k<span class=\"token operator\">&lt;&#061;<\/span><span class=\"token number\">31<\/span><span class=\"token punctuation\">;<\/span>k<span class=\"token operator\">&#043;&#043;<\/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       <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>mx1<span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n       <span class=\"token punctuation\">{<\/span><br \/>\n           cnt<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           a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">*&#061;<\/span>i<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>n<span class=\"token punctuation\">)<\/span><br \/>\n           <span class=\"token punctuation\">{<\/span><br \/>\n               fd<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n               ansk<span class=\"token operator\">&#061;<\/span>k<span class=\"token punctuation\">;<\/span><br \/>\n               ansmx<span class=\"token operator\">&#061;<\/span>i<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cnt<span class=\"token operator\">&gt;<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token keyword\">break<\/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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>fd<span class=\"token punctuation\">)<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;Impossible for &#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>n<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;.&#034;<\/span><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\">1<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;&#061;<\/span>ansmx<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           cout<span class=\"token operator\">&lt;&lt;<\/span>i<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;^&#034;<\/span><span class=\"token operator\">&lt;&lt;<\/span>ansk<span class=\"token punctuation\">;<\/span><br \/>\n           <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token operator\">!&#061;<\/span>ansmx<span class=\"token punctuation\">)<\/span>cout<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token string\">&#034;&#043;&#034;<\/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>L1-8\u73b0\u4ee3\u6218\u4e89<\/h4>\n<p>\u66b4\u529b\u601d\u8def\u4e3a\u6bcf\u6b21\u8f70\u70b8\u65f6\u904d\u5386\u5168\u90e8\u5143\u7d20\u5bfb\u627e\u6700\u5927\u503c\u6267\u884c\u64cd\u4f5c&#xff0c;\u8be5\u5199\u6cd5\u4f1a\u56e0\u65f6\u95f4\u590d\u6742\u5ea6\u8fc7\u9ad8\u8d85\u65f6&#xff0c;\u6211\u8003\u573a\u4e0a\u9760\u66b4\u529b\u62ff\u5230 14 \u5206\u3002 \u6b63\u89e3\u91c7\u7528\u4f18\u5148\u961f\u5217&#xff08;\u5927\u9876\u5806&#xff09;\u4f18\u5316&#xff0c;\u5229\u7528\u5806\u7ed3\u6784 O (1) \u53d6\u6700\u5927\u503c&#xff0c;\u66ff\u4ee3\u6bcf\u6b21\u904d\u5386\u627e\u6700\u5927\u503c\u7684 O (n) \u64cd\u4f5c&#xff0c;\u5373\u53ef\u6ee1\u8db3\u65f6\u95f4\u9650\u5236\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 macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">pii<\/span> <span class=\"token expression\">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;<\/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\">const<\/span> <span class=\"token keyword\">int<\/span> N<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1e3<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> g<span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>t<span class=\"token punctuation\">,<\/span>x<span class=\"token punctuation\">,<\/span>n<span class=\"token punctuation\">,<\/span>m<span class=\"token punctuation\">,<\/span>k<span class=\"token punctuation\">,<\/span>r<span class=\"token punctuation\">[<\/span><span class=\"token number\">1001<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>c<span class=\"token punctuation\">[<\/span><span class=\"token number\">1001<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">zha<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> h<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> l<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    r<span class=\"token punctuation\">[<\/span>h<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    c<span class=\"token punctuation\">[<\/span>l<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 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    priority_queue<span class=\"token operator\">&lt;<\/span>pair<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span>pii<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">,<\/span>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>pii<span class=\"token operator\">&gt;&gt;<\/span><span class=\"token operator\">&gt;<\/span>q<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 operator\">&gt;&gt;<\/span>k<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><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            cin<span class=\"token operator\">&gt;&gt;<\/span>g<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            q<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/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>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">{<\/span>i<span class=\"token punctuation\">,<\/span>j<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 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    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>q<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\">&amp;&amp;<\/span>cnt<span class=\"token operator\">&lt;<\/span>k<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">auto<\/span> <span class=\"token punctuation\">[<\/span>d<span class=\"token punctuation\">,<\/span>t<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span>q<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>q<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/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>x<span class=\"token punctuation\">,<\/span>y<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span>t<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>r<span class=\"token punctuation\">[<\/span>x<span class=\"token punctuation\">]<\/span><span class=\"token operator\">||<\/span>c<span class=\"token punctuation\">[<\/span>y<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token function\">zha<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span>y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>cnt<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> mxl<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    set<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span>s1<span class=\"token punctuation\">,<\/span>s2<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><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>r<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span>s1<span class=\"token punctuation\">.<\/span><span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span>i<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\">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><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>c<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span>mxl<span class=\"token operator\">&#061;<\/span>i<span class=\"token punctuation\">;<\/span>s2<span class=\"token punctuation\">.<\/span><span class=\"token function\">insert<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> i<span class=\"token operator\">:<\/span>s1<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> j<span class=\"token operator\">:<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            cout<span class=\"token operator\">&lt;&lt;<\/span>g<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>j<span class=\"token operator\">!&#061;<\/span>mxl<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        <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<h3>L2 \u9898\u76ee\u8be6\u89e3&#xff08;\u91cd\u70b9&#xff09;<\/h3>\n<p>L2 \u662f\u62c9\u5f00\u5206\u5dee\u7684\u6838\u5fc3\u533a\u95f4&#xff0c;\u4e5f\u662f\u5907\u8d5b\u7684\u91cd\u4e2d\u4e4b\u91cd&#xff0c;\u4ee5\u4e0b\u9010\u9898\u62c6\u89e3\u8003\u70b9\u4e0e\u89e3\u9898\u601d\u8def\u3002<\/p>\n<h4>L2-1 \u7b97\u5f0f\u62c6\u89e3<\/h4>\n<p>\u6808\u6a21\u62df \u8fd9\u662f\u4e00\u9053\u5178\u578b\u7684\u6808\u6a21\u62df\u5927\u9898&#xff0c;\u53ea\u8981\u80fd\u8bc6\u522b\u51fa \u201c\u8868\u8fbe\u5f0f\u5904\u7406\u2192\u6808\u201d \u7684\u6a21\u578b&#xff0c;\u5b9e\u73b0\u96be\u5ea6\u5e76\u4e0d\u9ad8\u3002\u6211\u5f53\u65f6\u672a\u80fd\u60f3\u5230&#xff0c;\u6700\u7ec8\u672c\u9898\u5f97 0 \u5206\u3002 \u6808\u662f\u5929\u68af\u8d5b L2 \u7684\u9ad8\u9891\u8003\u70b9&#xff0c;2026 \u5e74\u8d5b\u4e8b\u540c\u6837\u8003\u5bdf\u4e86\u6808\u76f8\u5173\u9898\u578b&#xff0c;\u5c5e\u4e8e L2 \u9636\u6bb5\u5fc5\u987b\u719f\u7ec3\u638c\u63e1\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9<\/p>\n<p>\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\">2e5<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">9<\/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>ans<span class=\"token punctuation\">;<\/span><br \/>\nstack<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">&gt;<\/span>st<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    string s<span class=\"token punctuation\">;<\/span><br \/>\n    cin<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>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><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;&#061;<\/span><span class=\"token char\">&#039;)&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <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            <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">!&#061;<\/span><span class=\"token char\">&#039;(&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                tmp<span class=\"token operator\">&#043;&#061;<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">reverse<\/span><span class=\"token punctuation\">(<\/span>tmp<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>tmp<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>tmp<span class=\"token operator\">&lt;&lt;<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/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 \u4e09\u70b9\u5171\u7ebf<\/h4>\n<p>\u504f\u601d\u7ef4\u9898 \u8fd9\u662f\u4e00\u9053\u504f\u6570\u5b66\u601d\u7ef4\u7684\u9898\u76ee&#xff0c;\u6838\u5fc3\u7a81\u7834\u53e3\u5728\u4e8e\u5229\u7528\u9898\u76ee\u9650\u5b9a\u6761\u4ef6\u7b80\u5316\u95ee\u9898\u3002 \u9898\u76ee\u4e2d\u70b9\u7684\u7eb5\u5750\u6807\u4ec5\u6709 3 \u79cd\u53d6\u503c&#xff0c;\u56e0\u6b64\u53ef\u4ee5\u6309\u7eb5\u5750\u6807\u5206\u7c7b&#xff0c;\u5b58\u50a8\u5bf9\u5e94\u6a2a\u5750\u6807\u7684\u96c6\u5408\u3002 \u6839\u636e\u4e09\u70b9\u5171\u7ebf\u7684\u6570\u5b66\u6027\u8d28&#xff1a;\u82e5\u70b9 (x0,0)\u3001(x1,1)\u3001(x2,2) \u5171\u7ebf&#xff0c;\u5219\u6ee1\u8db3x0&#043;x2&#061;2*x1\u3002 \u57fa\u4e8e\u8be5\u6027\u8d28&#xff0c;\u53ea\u9700\u679a\u4e3e\u5176\u4e2d\u4e24\u7c7b\u70b9\u7684\u6a2a\u5750\u6807&#xff0c;\u63a8\u5bfc\u7b2c\u4e09\u7c7b\u70b9\u7684\u76ee\u6807\u503c&#xff0c;\u5224\u65ad\u5176\u662f\u5426\u5b58\u5728\u5373\u53ef\u3002 \u5b9e\u73b0\u65f6\u6709\u4e24\u4e2a\u7ec6\u8282\u9700\u8981\u6ce8\u610f&#xff1a;\u4e00\u662f\u5b58\u5728\u91cd\u590d\u70b9&#xff0c;\u9700\u5148\u5bf9\u6a2a\u5750\u6807\u96c6\u5408\u53bb\u91cd&#xff1b;\u4e8c\u662f\u6a2a\u5750\u6807\u53ef\u80fd\u4e3a\u8d1f\u503c&#xff0c;\u6211\u5f53\u65f6\u91c7\u7528\u4e86\u5750\u6807\u504f\u79fb\u7684\u65b9\u5f0f\u5c06\u5176\u5168\u90e8\u8f6c\u4e3a\u6b63\u6570\u5904\u7406&#xff0c;\u5bf9\u7ed3\u679c\u65e0\u5f71\u54cd&#xff0c;\u4e5f\u53ef\u76f4\u63a5\u7528\u652f\u6301\u8d1f\u6570\u7684\u5b58\u50a8\u7ed3\u6784\u5b9e\u73b0\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\">9<\/span><span class=\"token punctuation\">,<\/span>P<span class=\"token operator\">&#061;<\/span><span class=\"token number\">3e6<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">9<\/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>ans<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> st<span class=\"token punctuation\">[<\/span><span class=\"token number\">6<\/span><span class=\"token operator\">*<\/span>P<span class=\"token punctuation\">]<\/span><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><br \/>\n    cin<span class=\"token operator\">&gt;&gt;<\/span>n<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>v0<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>v1<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        <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span>y<span class=\"token punctuation\">;<\/span><br \/>\n        cin<span class=\"token operator\">&gt;&gt;<\/span>x<span class=\"token operator\">&gt;&gt;<\/span>y<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>y<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>v0<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>y<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span>v1<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>y<span class=\"token operator\">&#061;&#061;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span>st<span class=\"token punctuation\">[<\/span>P<span class=\"token operator\">&#043;<\/span>x<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 punctuation\">}<\/span><br \/>\n    <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>v0<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>v0<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    <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>v1<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>v1<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    v0<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>v0<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>v0<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>v0<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    v1<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>v1<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>v1<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>v1<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    <span class=\"token keyword\">bool<\/span> fd<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> x1<span class=\"token operator\">:<\/span>v1<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> x0<span class=\"token operator\">:<\/span>v0<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>st<span class=\"token punctuation\">[<\/span>P<span class=\"token operator\">&#043;<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">*<\/span>x1<span class=\"token operator\">&#8211;<\/span>x0<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                fd<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%d, 0] [%d, 1] [%d, 2]\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>x0<span class=\"token punctuation\">,<\/span>x1<span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">*<\/span>x1<span class=\"token operator\">&#8211;<\/span>x0<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>fd<span class=\"token punctuation\">)<\/span>cout<span class=\"token operator\">&lt;&lt;<\/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\">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 \u80d6\u8fbe\u7684\u5c71\u5934<\/h4>\n<p>\u533a\u95f4\u5dee\u5206\u6a21\u677f\u9898 \u8003\u573a\u4e0a\u6211\u6ca1\u6709\u770b\u51fa\u6765\u662f\u5dee\u5206\u9898\u3002\u4f46\u662f\u6ce8\u610f\u5230\u8f93\u51fa\u5f88\u7b80\u5355&#xff0c;\u53ef\u4ee5\u9a97\u5206\u76f4\u63a5\u8f93\u51fa\u4e00\u4e2a\u6570&#xff0c;\u4ece0\u523010\u51e0\u4e00\u4e2a\u4e2a\u8bd5\u8bd5&#xff0c;\u53d1\u73b0\u8f93\u51fa11\u80fd\u5f9713\u5206&#xff01;\u5c31\u8fd9\u6837\u8003\u573a\u4e0a\u6211\u9a97\u5230\u4e8613\u5206 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260727050050-6a66e60281fa5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u672c\u9898\u6b63\u89e3\u662f\u5dee\u5206\u7684\u6807\u51c6\u5e94\u7528\u573a\u666f&#xff1a;\u6bcf\u53ea\u718a\u732b\u7684\u6d3b\u8dc3\u65f6\u95f4\u5bf9\u5e94\u4e00\u4e2a\u533a\u95f4 [l, r]&#xff0c;\u901a\u8fc7\u5dee\u5206\u6570\u7ec4 d [l]&#043;&#043;\u3001d [r&#043;1]&#8211; \u6807\u8bb0\u533a\u95f4&#xff0c;\u6700\u540e\u6c42\u524d\u7f00\u548c\u5373\u53ef\u5f97\u5230\u6bcf\u4e2a\u65f6\u95f4\u70b9\u7684\u6d3b\u8dc3\u718a\u732b\u6570\u91cf&#xff0c;\u904d\u5386\u53d6\u6700\u5927\u503c\u5373\u4e3a\u7b54\u6848\u3002<\/p>\n<p>\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\">3e5<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> d<span class=\"token punctuation\">[<\/span>N<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>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 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        <span class=\"token keyword\">int<\/span> h<span class=\"token punctuation\">,<\/span>m<span class=\"token punctuation\">,<\/span>s<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d:%d:%d&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>h<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>m<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        d<span class=\"token punctuation\">[<\/span>h<span class=\"token operator\">*<\/span><span class=\"token number\">3600<\/span><span class=\"token operator\">&#043;<\/span>m<span class=\"token operator\">*<\/span><span class=\"token number\">60<\/span><span class=\"token operator\">&#043;<\/span>s<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d:%d:%d&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>h<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>m<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        d<span class=\"token punctuation\">[<\/span>h<span class=\"token operator\">*<\/span><span class=\"token number\">3600<\/span><span class=\"token operator\">&#043;<\/span>m<span class=\"token operator\">*<\/span><span class=\"token number\">60<\/span><span class=\"token operator\">&#043;<\/span>s<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> t<span class=\"token operator\">&#061;<\/span><span class=\"token number\">60<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">3600<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">60<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">60<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">60<\/span><span class=\"token punctuation\">,<\/span>mx<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> 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>t<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        d<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#061;<\/span>d<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><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>d<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    cout<span class=\"token operator\">&lt;&lt;<\/span>mx<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 \u88abn\u6574\u9664\u7684n\u4f4d\u6570<\/h4>\n<p>DFS \u672c\u9898\u6b63\u89e3\u4e3aDFS&#xff0c;\u6309\u4f4d\u6784\u9020\u6570\u5b57\u5e76\u540c\u6b65\u5224\u65ad\u6574\u9664\u6027&#xff0c;\u5f53\u4f4d\u6570\u8fbe\u5230 n \u65f6\u6821\u9a8c\u662f\u5426\u5728\u6570\u503c\u8303\u56f4\u5185\u5373\u53ef\u3002 \u5f53\u65f6\u6211\u4e0d\u4f1a\u5199DFS&#xff0c;\u56e0\u6b64\u91c7\u7528\u4e86\u66b4\u529b\u679a\u4e3e\u7684\u5199\u6cd5&#xff1a;\u7f16\u5199check\u51fd\u6570\u540e\u904d\u5386\u533a\u95f4\u5185\u6240\u6709\u6570\u5b57&#xff0c;\u6700\u7ec8\u62ff\u5230 14 \u5206\u3002 \u5bf9\u4e8e\u96be\u5ea6\u504f\u9ad8\u7684 L2 \u9898\u76ee&#xff0c;\u66b4\u529b\u62ff\u90e8\u5206\u5206\u662f\u8003\u573a\u6027\u4ef7\u6bd4\u5f88\u9ad8\u7684\u7b56\u7565 check\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token keyword\">bool<\/span> <span class=\"token function\">ck<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    string s<span class=\"token punctuation\">,<\/span>tmp<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    s<span class=\"token operator\">&#061;<\/span><span class=\"token function\">to_string<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> len<span class=\"token operator\">&#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><br \/>\n    s<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034; &#034;<\/span><span class=\"token operator\">&#043;<\/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\">1<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;&#061;<\/span>len<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        tmp<span class=\"token operator\">&#043;&#061;<\/span>s<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><span class=\"token function\">stoi<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">)<\/span><span class=\"token operator\">%<\/span>i<span class=\"token operator\">!&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><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>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\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\">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\">9<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span>b<span class=\"token punctuation\">,<\/span>t<span class=\"token punctuation\">,<\/span>x<span class=\"token punctuation\">,<\/span>n<span class=\"token punctuation\">;<\/span><br \/>\nstring s<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> fd<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><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> u<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> cnt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token operator\">&#061;&#061;<\/span>n<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\">&gt;&#061;<\/span>a<span class=\"token operator\">&amp;&amp;<\/span>cnt<span class=\"token operator\">&lt;&#061;<\/span>b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            fd<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            cout<span class=\"token operator\">&lt;&lt;<\/span>cnt<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\">return<\/span> <span class=\"token punctuation\">;<\/span><br \/>\n    <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;&#061;<\/span><span class=\"token number\">9<\/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\">int<\/span> tmp<span class=\"token operator\">&#061;<\/span>cnt<span class=\"token operator\">*<\/span><span class=\"token number\">10<\/span><span class=\"token operator\">&#043;<\/span>i<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token operator\">%<\/span><span class=\"token punctuation\">(<\/span>u<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 keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>tmp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br 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