{"id":123894,"date":"2026-11-08T12:41:43","date_gmt":"2026-11-08T04:41:43","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/123894.html"},"modified":"2026-11-08T12:41:43","modified_gmt":"2026-11-08T04:41:43","slug":"2026%e5%8d%8e%e4%b8%baod%e6%9c%ba%e8%af%95%e7%9c%9f%e9%a2%98-10%e6%9c%8818%e6%97%a5-%e6%96%b0%e7%b3%bb%e7%bb%9f-%e3%80%90%e5%b0%8f%e8%8a%b1%e7%9a%84ai-workflow%e8%ae%be%e8%ae%a1%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/123894.html","title":{"rendered":"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 10\u670818\u65e5 \u65b0\u7cfb\u7edf \u3010\u5c0f\u82b1\u7684AI Workflow\u8bbe\u8ba1\u3011"},"content":{"rendered":"<h2>\u5c0f\u82b1\u7684AI Workflow\u8bbe\u8ba1(Py\/C\/C&#043;&#043;\/JAVA \/Js\/Go)\u9898\u89e3<\/h2>\n<p>\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 \u65b0\u7cfb\u7edf \u534e\u4e3aOD\u4e0a\u673a\u8003\u8bd5\u771f\u9898\u65b0\u7cfb\u7edf 10\u670818\u53f7 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class=\"katex-mathml\"><\/p>\n<p>        s<\/p>\n<p>       s<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span> \u548c\u7ec8\u6b62\u8282\u70b9 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        t<\/p>\n<p>       t<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6151em\"><\/span><span class=\"mord mathnormal\">t<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u6c42\u4ece\u8d77\u59cb\u8282\u70b9 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        s<\/p>\n<p>       s<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span> 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style=\"margin-right: 0.0359em\">v<\/span><\/span><\/span><\/span><\/span>&#xff09;\u3002<\/li>\n<li>\u4f9d\u8d56\u5173\u7cfb\u6784\u6210\u6709\u5411\u65e0\u73af\u56fe&#xff08;DAG&#xff09;&#xff0c;\u4fdd\u8bc1\u65e0\u5faa\u73af\u4f9d\u8d56\u3002<\/li>\n<p>\u8fd4\u56de\u503c&#xff1a;\u8fd4\u56de\u4ece <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        s<\/p>\n<p>       s<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span> \u5230 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        t<\/p>\n<p>       t<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6151em\"><\/span><span class=\"mord mathnormal\">t<\/span><\/span><\/span><\/span><\/span> 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style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>&#xff08;\u8868\u793a\u5b58\u5728\u4e00\u6761\u957f\u5ea6\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         0<\/p>\n<p>        0<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">0<\/span><\/span><\/span><\/span><\/span> \u7684\u8def\u5f84&#xff09;\u3002<\/li>\n<li>\u82e5\u4ece <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         s<\/p>\n<p>        s<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span> \u65e0\u6cd5\u5230\u8fbe <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         t<\/p>\n<p>        t<\/p>\n<p> 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\u5206\u9694&#xff1b;\u6ca1\u6709\u4f9d\u8d56\u5173\u7cfb\u65f6\u4e3a\u7a7a\u5b57\u7b26\u4e32\u3002<\/p>\n<\/li>\n<li>\n<p>s:\u6574\u6570&#xff0c;\u8d77\u59cb\u8282\u70b9\u7f16\u53f7<\/p>\n<\/li>\n<li>\n<p>t:\u6574\u6570&#xff0c;\u7ec8\u70b9\u8282\u70b9\u7f16\u53f7<\/p>\n<\/li>\n<\/ul>\n<p>\u6570\u636e\u8303\u56f4&#xff1a;<\/p>\n<ul>\n<li><span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         1<\/p>\n<p>         \u2264<\/p>\n<p>         n<\/p>\n<p>         \u2264<\/p>\n<p>         10000<\/p>\n<p>        1 \\\\le n \\\\le 10000<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7804em;vertical-align: -0.136em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.7719em;vertical-align: -0.136em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">10000<\/span><\/span><\/span><\/span><\/span>&#xff1b;<\/li>\n<li><span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         0<\/p>\n<p>         \u2264<\/p>\n<p>         edges.length<\/p>\n<p>         \u2264<\/p>\n<p>         100000<\/p>\n<p>        0 \\\\le \\\\text{edges.length} \\\\le 100000<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7804em;vertical-align: -0.136em\"><\/span><span class=\"mord\">0<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8889em;vertical-align: -0.1944em\"><\/span><span class=\"mord text\"><span class=\"mord\">edges.length<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">100000<\/span><\/span><\/span><\/span><\/span>&#xff1b;<\/li>\n<li>\u6bcf\u6761\u4f9d\u8d56 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         [<\/p>\n<p>         u<\/p>\n<p>         ,<\/p>\n<p>         v<\/p>\n<p>         ]<\/p>\n<p>        [u, v]<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">[<\/span><span class=\"mord mathnormal\">u<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0359em\">v<\/span><span class=\"mclose\">]<\/span><\/span><\/span><\/span><\/span> \u6ee1\u8db3 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         1<\/p>\n<p>         \u2264<\/p>\n<p>         u<\/p>\n<p>         ,<\/p>\n<p>         v<\/p>\n<p>         \u2264<\/p>\n<p>         n<\/p>\n<p>        1 \\\\le u, v \\\\le n<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7804em;vertical-align: -0.136em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8304em;vertical-align: -0.1944em\"><\/span><span class=\"mord mathnormal\">u<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0359em\">v<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span>\u3001<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         u<\/p>\n<p>         \u2260<\/p>\n<p>         v<\/p>\n<p>        u \\\\ne v<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8889em;vertical-align: -0.1944em\"><\/span><span class=\"mord mathnormal\">u<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\"><span class=\"mrel\"><span class=\"mord vbox\"><span class=\"thinbox\"><span class=\"rlap\"><span class=\"strut\" style=\"height: 0.8889em;vertical-align: -0.1944em\"><\/span><span class=\"inner\"><span class=\"mord\"><span class=\"mrel\">\ue020<\/span><\/span><\/span><span class=\"fix\"><\/span><\/span><\/span><\/span><\/span><span class=\"mspace nobreak\"><\/span><span class=\"mrel\">&#061;<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0359em\">v<\/span><\/span><\/span><\/span><\/span>&#xff1b;<\/li>\n<li>\u4f9d\u8d56\u5173\u7cfb\u4fdd\u8bc1\u65e0\u73af&#xff1b;<\/li>\n<li><span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         1<\/p>\n<p>         \u2264<\/p>\n<p>         s<\/p>\n<p>         ,<\/p>\n<p>         t<\/p>\n<p>         \u2264<\/p>\n<p>         n<\/p>\n<p>        1 \\\\le s, t \\\\le n<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7804em;vertical-align: -0.136em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8304em;vertical-align: -0.1944em\"><\/span><span class=\"mord mathnormal\">s<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord mathnormal\">t<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2264<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">n<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<h2>\u8f93\u51fa\u63cf\u8ff0<\/h2>\n<p>\u8f93\u51fa\u4e00\u884c\u4e00\u4e2a\u5341\u8fdb\u5236\u6574\u6570&#xff0c;\u8868\u793a\u4ece <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        s<\/p>\n<p>       s<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span> \u5230 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        t<\/p>\n<p>       t<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6151em\"><\/span><span class=\"mord mathnormal\">t<\/span><\/span><\/span><\/span><\/span> \u7684\u8def\u5f84\u603b\u6570\u3002<\/p>\n<ul>\n<li>\u82e5 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         s<\/p>\n<p>         &#061;<\/p>\n<p>         t<\/p>\n<p>        s &#061; t<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6151em\"><\/span><span class=\"mord mathnormal\">t<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u8f93\u51fa 1&#xff1b;<\/li>\n<li>\u82e5\u4ece <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         s<\/p>\n<p>        s<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.4306em\"><\/span><span class=\"mord mathnormal\">s<\/span><\/span><\/span><\/span><\/span> \u65e0\u6cd5\u5230\u8fbe <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         t<\/p>\n<p>        t<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6151em\"><\/span><span class=\"mord mathnormal\">t<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u8f93\u51fa 0&#xff1b;<\/li>\n<li>\u6570\u636e\u4fdd\u8bc1\u7b54\u6848\u4e0d\u8d85\u8fc7 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>          2<\/p>\n<p>          31<\/p>\n<p>         \u2212<\/p>\n<p>         1<\/p>\n<p>        2^{31}-1<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8974em;vertical-align: -0.0833em\"><\/span><span class=\"mord\"><span class=\"mord\">2<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">31<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<h2>\u6837\u4f8b1<\/h2>\n<p>\u8f93\u5165<\/p>\n<p>4<br \/>\n1,2 1,3 2,4 3,4<br \/>\n1 4<\/p>\n<p>\u8f93\u51fa<\/p>\n<p>2<\/p>\n<p>\u8bf4\u660e<\/p>\n<p> 1<br \/>\n\/ \\\\<br \/>\n2   3<br \/>\n\\\\ \/<br \/>\n4<\/p>\n<p>\u4ece\u8282\u70b9 1 \u5230\u8282\u70b9 4 \u6709\u4e24\u6761\u8def\u5f84&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1<\/p>\n<p>        \u2192<\/p>\n<p>       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\u2192<\/p>\n<p>        4<\/p>\n<p>       1 \\\\to 3 \\\\to 4<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">3<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">4<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<h2>\u6837\u4f8b2<\/h2>\n<p>\u8f93\u5165<\/p>\n<p>6<br \/>\n1,2 1,3 2,4 3,5 4,5 5,6<br \/>\n1 6<\/p>\n<p>\u8f93\u51fa<\/p>\n<p>2<\/p>\n<p>\u8bf4\u660e<\/p>\n<p>   1<br \/>\n  \/ \\\\<br \/>\n 2   3<br \/>\n |   |<br \/>\n 4   |<br \/>\n  \\\\ \/<br \/>\n   5<br \/>\n   |<br \/>\n   6<\/p>\n<p>\u4ece\u8282\u70b9 1 \u5230\u8282\u70b9 6 \u6709\u4e24\u6761\u8def\u5f84&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1<\/p>\n<p>        \u2192<\/p>\n<p>        2<\/p>\n<p>        \u2192<\/p>\n<p>        4<\/p>\n<p>        \u2192<\/p>\n<p>        5<\/p>\n<p>        \u2192<\/p>\n<p>        6<\/p>\n<p>       1 \\\\to 2 \\\\to 4 \\\\to 5 \\\\to 6<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">2<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">4<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">5<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">6<\/span><\/span><\/span><\/span><\/span> \u548c <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        1<\/p>\n<p>        \u2192<\/p>\n<p>        3<\/p>\n<p>        \u2192<\/p>\n<p>        5<\/p>\n<p>        \u2192<\/p>\n<p>        6<\/p>\n<p>       1 \\\\to 3 \\\\to 5 \\\\to 6<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">3<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">5<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2192<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">6<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<h2>\u6837\u4f8b3<\/h2>\n<p>\u8f93\u5165<\/p>\n<p>4<br \/>\n1,2 3,4<br \/>\n1 4<\/p>\n<p>\u8f93\u51fa<\/p>\n<p>0<\/p>\n<p>\u8bf4\u660e \u8282\u70b9 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        {<\/p>\n<p>        1<\/p>\n<p>        ,<\/p>\n<p>        2<\/p>\n<p>        }<\/p>\n<p>       \\\\{1, 2\\\\}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">{<\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">2<\/span><span class=\"mclose\">}<\/span><\/span><\/span><\/span><\/span> \u4e0e <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>        {<\/p>\n<p>        3<\/p>\n<p>        ,<\/p>\n<p>        4<\/p>\n<p>        }<\/p>\n<p>       \\\\{3, 4\\\\}<\/p>\n<p>    <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">{<\/span><span class=\"mord\">3<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord\">4<\/span><span class=\"mclose\">}<\/span><\/span><\/span><\/span><\/span> \u5c5e\u4e8e\u4e24\u4e2a\u4e0d\u8fde\u901a\u7684\u5b50\u56fe&#xff0c;\u4ece\u8282\u70b9 1 \u65e0\u6cd5\u5230\u8fbe\u8282\u70b9 4&#xff0c;\u8def\u5f84\u6570\u4e3a 0\u3002<\/p>\n<h2>\u6837\u4f8b4<\/h2>\n<p>\u8f93\u5165<\/p>\n<p>1<\/p>\n<p>1 1<\/p>\n<p>\u8f93\u51fa<\/p>\n<p>1<\/p>\n<p>\u8bf4\u660e \u53ea\u6709\u4e00\u4e2a\u8282\u70b9&#xff0c;\u8d77\u59cb\u8282\u70b9\u548c\u7ec8\u6b62\u8282\u70b9\u76f8\u540c&#xff0c;\u65e0\u9700\u6267\u884c\u5176\u4ed6\u8282\u70b9&#xff0c;\u8def\u5f84\u6570\u4e3a 1\u3002<\/p>\n<h2>\u9898\u89e3<\/h2>\n<p>\u601d\u8def&#xff1a;\u52a8\u6001\u89c4\u5212 &#043; \u62d3\u6251\u6392\u5e8f<\/p>\n<li>\u6839\u636e\u7ed9\u51fa\u7684edge\u5efa\u7acb\u90bb\u63a5\u8868&#xff0c;\u4f7f\u7528\u62d3\u6251\u6392\u5e8f\u5904\u7406\u4f9d\u8d56\u95ee\u9898&#xff0c;\u9884\u5904\u7406\u7edf\u8ba1\u6bcf\u4e2a\u8282\u70b9\u7684\u5165\u5ea6\u3002<\/li>\n<li>\u5b9a\u4e49dp[i]\u8868\u793a\u4ece\u8d77\u70b9\u5230\u8282\u70b9i\u7684\u8def\u5f84\u6570\u91cf\u3002<\/li>\n<li>\u521d\u59cb\u5316dp[s] &#061; 1, \u5c06\u6240\u6709\u5165\u5ea6\u4e3a0\u8282\u70b9\u52a0\u5165\u961f\u5217\u3002<\/li>\n<li>\u4f7f\u7528BFS\u8fdb\u884c\u62d3\u6251\u6392\u5e8f\n<li>\u53d6\u51fa\u961f\u9996\u8282\u70b9u, \u904d\u5386\u4ed6\u7684\u6240\u6709\u540e\u7ee7\u8282\u70b9v<\/li>\n<li>\u66f4\u65b0\u8282\u70b9v\u7684\u8def\u5f84\u6570&#xff0c;dp[v] &#043;&#061; dp[u]<\/li>\n<li>\u5c06 v \u7684\u5165\u5ea6\u51cf\u4e00&#xff0c;\u5982\u679c\u5165\u5ea6\u53d8\u6210 0&#xff0c;\u52a0\u5165\u961f\u5217\u3002<\/li>\n<\/li>\n<li>\u6700\u7ec8\u7ed3\u679c\u5373\u4e3adp[t]<\/li>\n<h3>C&#043;&#043;<\/h3>\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\">include<\/span> <span class=\"token string\">&lt;queue&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;vector&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">using<\/span> <span class=\"token keyword\">namespace<\/span> std<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u901a\u7528 \u5207\u5272\u51fd\u6570 \u51fd\u6570 \u5c06\u5b57\u7b26\u4e32str\u6839\u636edelimiter\u8fdb\u884c\u5207\u5272<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> str<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> delimiter<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    size_t start <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    size_t end <span class=\"token operator\">&#061;<\/span> str<span class=\"token punctuation\">.<\/span><span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>delimiter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>end <span class=\"token operator\">!&#061;<\/span> string<span class=\"token double-colon punctuation\">::<\/span>npos<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>start<span class=\"token punctuation\">,<\/span> end <span class=\"token operator\">&#8211;<\/span> start<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        start <span class=\"token operator\">&#061;<\/span> end <span class=\"token operator\">&#043;<\/span> delimiter<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        end <span class=\"token operator\">&#061;<\/span> str<span class=\"token punctuation\">.<\/span><span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>delimiter<span class=\"token punctuation\">,<\/span> start<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6dfb\u52a0\u6700\u540e\u4e00\u4e2a\u90e8\u5206<\/span><br \/>\n    result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">.<\/span><span class=\"token function\">substr<\/span><span class=\"token punctuation\">(<\/span>start<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> result<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\">solve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> n<span class=\"token punctuation\">,<\/span> vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;&gt;<\/span><span class=\"token operator\">&amp;<\/span> edge<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> t<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 operator\">&#061;&#061;<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u90bb\u63a5\u8868<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;&gt;<\/span> <span class=\"token function\">graph<\/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    <span class=\"token comment\">\/\/ \u7edf\u8ba1\u5165\u5ea6<\/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\">indegree<\/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 number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8868\u793a\u4ece\u8d77\u70b9 s \u5230\u8282\u70b9 i \u7684\u8def\u5f84\u6570\u91cf<\/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\">dp<\/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 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\">auto<\/span><span class=\"token operator\">&amp;<\/span> e <span class=\"token operator\">:<\/span> edge<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> u <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> v <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        graph<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>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    dp<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    queue<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> q<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;&#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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><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>i<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 comment\">\/\/\u62d3\u6251\u6392\u5e8f\u6c42\u8def\u5f84<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>q<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\">int<\/span> u <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">.<\/span><span class=\"token function\">front<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        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\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> v <span class=\"token operator\">:<\/span> graph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            dp<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> dp<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><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>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> dp<span class=\"token punctuation\">[<\/span>t<span class=\"token punctuation\">]<\/span><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    string input1<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> s<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 punctuation\">;<\/span><br \/>\n    cin<span class=\"token punctuation\">.<\/span><span class=\"token function\">ignore<\/span><span class=\"token punctuation\">(<\/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> input1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cin <span class=\"token operator\">&gt;&gt;<\/span> s <span class=\"token operator\">&gt;&gt;<\/span> t<span class=\"token punctuation\">;<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;&gt;<\/span> edge<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>input1<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        vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span> tmp <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span>input1<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> tmp<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            vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span> tmp1 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span>tmp<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;,&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            edge<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><span class=\"token function\">stoi<\/span><span class=\"token punctuation\">(<\/span>tmp1<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">stoi<\/span><span class=\"token punctuation\">(<\/span>tmp1<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/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 punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ans <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> edge<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cout <span class=\"token operator\">&lt;&lt;<\/span> ans<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><\/p>\n<h3>Java<\/h3>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token operator\">*<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Main<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> n<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> edge<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> t<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 operator\">&#061;&#061;<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <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>        <span class=\"token comment\">\/\/ \u90bb\u63a5\u8868<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> graph <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">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> 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            graph<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/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 punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7edf\u8ba1\u5165\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> indegree <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/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><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8868\u793a\u4ece\u8d77\u70b9 s \u5230\u8282\u70b9 i \u7684\u8def\u5f84\u6570\u91cf<\/span><br \/>\n        <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> dp <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/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><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> e <span class=\"token operator\">:<\/span> edge<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> u <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> v <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            graph<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        dp<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Queue<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> q <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LinkedList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">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> 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\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                q<span class=\"token punctuation\">.<\/span><span class=\"token function\">offer<\/span><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        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u62d3\u6251\u6392\u5e8f\u6c42\u8def\u5f84<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>q<span class=\"token punctuation\">.<\/span><span class=\"token function\">isEmpty<\/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\">int<\/span> u <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">.<\/span><span class=\"token function\">poll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/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> v <span class=\"token operator\">:<\/span> graph<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                dp<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> dp<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    q<span class=\"token punctuation\">.<\/span><span class=\"token function\">offer<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> dp<span class=\"token punctuation\">[<\/span>t<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> sc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">String<\/span> input1 <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/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> s <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> t <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&gt;<\/span> edges <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>input1<span class=\"token punctuation\">.<\/span><span class=\"token function\">trim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">isEmpty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> tmp <span class=\"token operator\">&#061;<\/span> input1<span class=\"token punctuation\">.<\/span><span class=\"token function\">trim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\\\\\s&#043;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str <span class=\"token operator\">:<\/span> tmp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> tmp1 <span class=\"token operator\">&#061;<\/span> str<span class=\"token punctuation\">.<\/span><span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;,&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                edges<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parseInt<\/span><span class=\"token punctuation\">(<\/span>tmp1<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parseInt<\/span><span class=\"token punctuation\">(<\/span>tmp1<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><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 punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> edge <span class=\"token operator\">&#061;<\/span> edges<span class=\"token punctuation\">.<\/span><span class=\"token function\">toArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><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 function\">solve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> edge<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>Python<\/h3>\n<p><span class=\"token keyword\">from<\/span> collections <span class=\"token keyword\">import<\/span> deque<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> edge<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> s <span class=\"token operator\">&#061;&#061;<\/span> t<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>    <span class=\"token comment\"># \u90bb\u63a5\u8868<\/span><br \/>\n    graph <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">for<\/span> _ <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/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><\/p>\n<p>    <span class=\"token comment\"># \u7edf\u8ba1\u5165\u5ea6<\/span><br \/>\n    indegree <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8868\u793a\u4ece\u8d77\u70b9 s \u5230\u8282\u70b9 i \u7684\u8def\u5f84\u6570\u91cf<\/span><br \/>\n    dp <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> u<span class=\"token punctuation\">,<\/span> v <span class=\"token keyword\">in<\/span> edge<span class=\"token punctuation\">:<\/span><br \/>\n        graph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><br \/>\n        indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>    dp<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>    q <span class=\"token operator\">&#061;<\/span> deque<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/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        <span class=\"token keyword\">if<\/span> indegree<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            q<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u62d3\u6251\u6392\u5e8f\u6c42\u8def\u5f84<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> q<span class=\"token punctuation\">:<\/span><br \/>\n        u <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">.<\/span>popleft<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> v <span class=\"token keyword\">in<\/span> graph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            dp<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> dp<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><br \/>\n            indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">-&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                q<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> dp<span class=\"token punctuation\">[<\/span>t<span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    n <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">input<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    input1 <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">input<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>strip<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    s<span class=\"token punctuation\">,<\/span> t <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">input<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>split<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    edge <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> input1<span class=\"token punctuation\">:<\/span><br \/>\n        tmp <span class=\"token operator\">&#061;<\/span> input1<span class=\"token punctuation\">.<\/span>split<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> item <span class=\"token keyword\">in<\/span> tmp<span class=\"token punctuation\">:<\/span><br \/>\n            u<span class=\"token punctuation\">,<\/span> v <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> item<span class=\"token punctuation\">.<\/span>split<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;,&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            edge<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    ans <span class=\"token operator\">&#061;<\/span> solve<span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> edge<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#034;__main__&#034;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    main<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h3>JavaScript<\/h3>\n<p><span class=\"token keyword\">const<\/span> readline <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">require<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;readline&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> rl <span class=\"token operator\">&#061;<\/span> readline<span class=\"token punctuation\">.<\/span><span class=\"token function\">createInterface<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token literal-property property\">input<\/span><span class=\"token operator\">:<\/span> process<span class=\"token punctuation\">.<\/span>stdin<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token literal-property property\">output<\/span><span class=\"token operator\">:<\/span> process<span class=\"token punctuation\">.<\/span>stdout<br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">let<\/span> lines <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>rl<span class=\"token punctuation\">.<\/span><span class=\"token function\">on<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;line&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token parameter\">line<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    lines<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>line<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>lines<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#061;&#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\">const<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">parseInt<\/span><span class=\"token punctuation\">(<\/span>lines<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> input1 <span class=\"token operator\">&#061;<\/span> lines<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">trim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> lines<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">trim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">\\\\s&#043;<\/span><span class=\"token regex-delimiter\">\/<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>Number<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">const<\/span> edge <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>input1<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">const<\/span> tmp <span class=\"token operator\">&#061;<\/span> input1<span class=\"token punctuation\">.<\/span><span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token regex\"><span class=\"token regex-delimiter\">\/<\/span><span class=\"token regex-source language-regex\">\\\\s&#043;<\/span><span class=\"token regex-delimiter\">\/<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> item <span class=\"token keyword\">of<\/span> tmp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> item<span class=\"token punctuation\">.<\/span><span class=\"token function\">split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;,&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>Number<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                edge<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">,<\/span> v<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\">const<\/span> ans <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> edge<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        rl<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">n<span class=\"token punctuation\">,<\/span> edge<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> t<\/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 operator\">&#061;&#061;&#061;<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <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>    <span class=\"token comment\">\/\/ \u90bb\u63a5\u8868<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> graph <span class=\"token operator\">&#061;<\/span> Array<span class=\"token punctuation\">.<\/span><span class=\"token function\">from<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token literal-property property\">length<\/span><span class=\"token operator\">:<\/span> n <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><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/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 comment\">\/\/ \u7edf\u8ba1\u5165\u5ea6<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> indegree <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Array<\/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><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8868\u793a\u4ece\u8d77\u70b9 s \u5230\u8282\u70b9 i \u7684\u8def\u5f84\u6570\u91cf<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> dp <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Array<\/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><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">of<\/span> edge<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        graph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    dp<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> q <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> head <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/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> 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\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">0<\/span><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>i<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 comment\">\/\/ \u62d3\u6251\u6392\u5e8f\u6c42\u8def\u5f84<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>head <span class=\"token operator\">&lt;<\/span> q<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> u <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">[<\/span>head<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> v <span class=\"token keyword\">of<\/span> graph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            dp<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> dp<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">0<\/span><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>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> dp<span class=\"token punctuation\">[<\/span>t<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>Go<\/h3>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n<span class=\"token string\">&#034;bufio&#034;<\/span><br \/>\n<span class=\"token string\">&#034;fmt&#034;<\/span><br \/>\n<span class=\"token string\">&#034;os&#034;<\/span><br \/>\n<span class=\"token string\">&#034;strconv&#034;<\/span><br \/>\n<span class=\"token string\">&#034;strings&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> edge <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> s <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> t <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">int<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> s <span class=\"token operator\">&#061;&#061;<\/span> t <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u90bb\u63a5\u8868<\/span><br \/>\ngraph <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> n<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7edf\u8ba1\u5165\u5ea6<\/span><br \/>\nindegree <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> n<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8868\u793a\u4ece\u8d77\u70b9 s \u5230\u8282\u70b9 i \u7684\u8def\u5f84\u6570\u91cf<\/span><br \/>\ndp <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> n<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> e <span class=\"token operator\">:&#061;<\/span> <span class=\"token keyword\">range<\/span> edge <span class=\"token punctuation\">{<\/span><br \/>\nu<span class=\"token punctuation\">,<\/span> v <span class=\"token operator\">:&#061;<\/span> e<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\ngraph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>graph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">)<\/span><br \/>\nindegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>dp<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>q <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">for<\/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> 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> indegree<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nq <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">,<\/span> i<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 comment\">\/\/ \u62d3\u6251\u6392\u5e8f\u6c42\u8def\u5f84<\/span><br \/>\nhead <span class=\"token operator\">:&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n<span class=\"token keyword\">for<\/span> head <span class=\"token operator\">&lt;<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nu <span class=\"token operator\">:&#061;<\/span> q<span class=\"token punctuation\">[<\/span>head<span class=\"token punctuation\">]<\/span><br \/>\nhead<span class=\"token operator\">&#043;&#043;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> v <span class=\"token operator\">:&#061;<\/span> <span class=\"token keyword\">range<\/span> graph<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\ndp<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> dp<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><br \/>\nindegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nq <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> dp<span class=\"token punctuation\">[<\/span>t<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nreader <span class=\"token operator\">:&#061;<\/span> bufio<span class=\"token punctuation\">.<\/span><span class=\"token function\">NewReader<\/span><span class=\"token punctuation\">(<\/span>os<span class=\"token punctuation\">.<\/span>Stdin<span class=\"token punctuation\">)<\/span><\/p>\n<p>line1<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> reader<span class=\"token punctuation\">.<\/span><span class=\"token function\">ReadString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nn<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> strconv<span class=\"token punctuation\">.<\/span><span class=\"token function\">Atoi<\/span><span class=\"token punctuation\">(<\/span>strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">TrimSpace<\/span><span class=\"token punctuation\">(<\/span>line1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>input1<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> reader<span class=\"token punctuation\">.<\/span><span class=\"token function\">ReadString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\ninput1 <span class=\"token operator\">&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">TrimSpace<\/span><span class=\"token punctuation\">(<\/span>input1<span class=\"token punctuation\">)<\/span><\/p>\n<p>line3<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> reader<span class=\"token punctuation\">.<\/span><span class=\"token function\">ReadString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nst <span class=\"token operator\">:&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fields<\/span><span class=\"token punctuation\">(<\/span>line3<span class=\"token punctuation\">)<\/span><\/p>\n<p>s<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> strconv<span class=\"token punctuation\">.<\/span><span class=\"token function\">Atoi<\/span><span class=\"token punctuation\">(<\/span>st<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\nt<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> strconv<span class=\"token punctuation\">.<\/span><span class=\"token function\">Atoi<\/span><span class=\"token punctuation\">(<\/span>st<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>edge <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> input1 <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\ntmp <span class=\"token operator\">:&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fields<\/span><span class=\"token punctuation\">(<\/span>input1<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> item <span class=\"token operator\">:&#061;<\/span> <span class=\"token keyword\">range<\/span> tmp <span class=\"token punctuation\">{<\/span><br \/>\ntmp1 <span class=\"token operator\">:&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">Split<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;,&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>u<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> strconv<span class=\"token punctuation\">.<\/span><span class=\"token function\">Atoi<\/span><span class=\"token punctuation\">(<\/span>tmp1<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\nv<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">_<\/span> <span class=\"token operator\">:&#061;<\/span> strconv<span class=\"token punctuation\">.<\/span><span class=\"token function\">Atoi<\/span><span class=\"token punctuation\">(<\/span>tmp1<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>edge <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>edge<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">{<\/span>u<span class=\"token punctuation\">,<\/span> v<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>ans <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> edge<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">)<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>C\u8bed\u8a00<\/h3>\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;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">MAXN<\/span> <span class=\"token expression\"><span class=\"token number\">100005<\/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\">MAXE<\/span> <span class=\"token expression\"><span class=\"token number\">200005<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> head<span class=\"token punctuation\">[<\/span>MAXN<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> to<span class=\"token punctuation\">[<\/span>MAXE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> next<span class=\"token punctuation\">[<\/span>MAXE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> indegree<span class=\"token punctuation\">[<\/span>MAXN<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> dp<span class=\"token punctuation\">[<\/span>MAXN<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> edgeCount <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6dfb\u52a0\u6709\u5411\u8fb9<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">addEdge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> u<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> v<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    to<span class=\"token punctuation\">[<\/span>edgeCount<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> v<span class=\"token punctuation\">;<\/span><br \/>\n    next<span class=\"token punctuation\">[<\/span>edgeCount<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> head<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    head<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> edgeCount<span class=\"token operator\">&#043;&#043;<\/span><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\">solve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> n<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> edge<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> m<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> t<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 operator\">&#061;&#061;<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <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>    <span class=\"token comment\">\/\/ \u90bb\u63a5\u8868\u521d\u59cb\u5316<\/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;&#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        head<span class=\"token punctuation\">[<\/span>i<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><br \/>\n        indegree<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dp<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    edgeCount <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6784\u5efa\u90bb\u63a5\u8868\u5e76\u7edf\u8ba1\u5165\u5ea6<\/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 operator\">&#061;<\/span> edge<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> v <span class=\"token operator\">&#061;<\/span> edge<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token function\">addEdge<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">,<\/span> v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8868\u793a\u4ece\u8d77\u70b9 s \u5230\u8282\u70b9 i \u7684\u8def\u5f84\u6570\u91cf<\/span><br \/>\n    dp<span class=\"token punctuation\">[<\/span>s<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/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 operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> front <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> rear <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/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;&#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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            q<span class=\"token punctuation\">[<\/span>rear<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> i<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 comment\">\/\/ \u62d3\u6251\u6392\u5e8f\u6c42\u8def\u5f84<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>front <span class=\"token operator\">&lt;<\/span> rear<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> u <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">[<\/span>front<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/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> head<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&#061;<\/span> next<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\">int<\/span> v <span class=\"token operator\">&#061;<\/span> to<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            dp<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> dp<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>indegree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                q<span class=\"token punctuation\">[<\/span>rear<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> v<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> ans <span class=\"token operator\">&#061;<\/span> dp<span class=\"token punctuation\">[<\/span>t<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> ans<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> s<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> input1<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">fgets<\/span><span class=\"token punctuation\">(<\/span>input1<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>input1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d %d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>s<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>t<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> edge<span class=\"token punctuation\">[<\/span>MAXE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/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> m <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u89e3\u6790\u8fb9<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>token <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strtok<\/span><span class=\"token punctuation\">(<\/span>input1<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034; \\\\n\\\\r&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>token <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/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>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">sscanf<\/span><span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;%d,%d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>u<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>v<span class=\"token punctuation\">)<\/span> <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            edge<span class=\"token punctuation\">[<\/span>m<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> u<span class=\"token punctuation\">;<\/span><br \/>\n            edge<span class=\"token punctuation\">[<\/span>m<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> v<span class=\"token punctuation\">;<\/span><br \/>\n            m<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        token <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strtok<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034; \\\\n\\\\r&#034;<\/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\">int<\/span> ans <span class=\"token operator\">&#061;<\/span> <span class=\"token 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