{"id":122552,"date":"2026-11-05T05:32:56","date_gmt":"2026-11-04T21:32:56","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/122552.html"},"modified":"2026-11-05T05:32:56","modified_gmt":"2026-11-04T21:32:56","slug":"2026%e5%8d%8e%e4%b8%baod%e6%9c%ba%e8%af%95%e7%9c%9f%e9%a2%98-11-1-%e6%96%b0%e7%b3%bb%e7%bb%9f-%e5%b1%b1%e5%8c%ba%e6%95%91%e6%8f%b4%e8%b7%af%e7%ba%bf%e8%a7%84%e5%88%92","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/122552.html","title":{"rendered":"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212"},"content":{"rendered":"<p>        \/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/<br \/>\n        #content_views .toc,<br \/>\n        \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/<br \/>\n        #content_views.markdown_views &gt; p:empty:has(+ .toc),<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty,<br \/>\n        \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/<br \/>\n        #content_views.htmledit_views #main-toc,<br \/>\n        #content_views.htmledit_views #hr-toc,<br \/>\n        #content_views.htmledit_views p[id*=\\&#8221;-toc\\&#8221;] {<br \/>\n          display: none !important;<br \/>\n        }<br \/>\n        \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/<br \/>\n        #content_views.markdown_views &gt; .toc + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + h4,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h4 {<br \/>\n          margin-top: 0 !important;<br \/>\n        }<\/p>\n<h2>\u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212(Java\/Py\/C\/C&#043;&#043;\/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 11\u67081\u53f7 200\u5206\u9898\u578b<\/p>\n<p>\u534e\u4e3aOD\u673a\u8bd5\u65b0\u7cfb\u7edf\u771f\u9898\u76ee\u5f55\u70b9\u51fb\u67e5\u770b:  \u534e\u4e3aOD\u673a\u8bd5\u65b0\u7cfb\u7edf\u771f\u9898\u9898\u5e93\u76ee\u5f55&#xff5c;\u673a\u8003\u9898\u5e93 &#043; \u7b97\u6cd5\u8003\u70b9\u8be6\u89e3<\/p>\n<h2>\u9898\u76ee\u5185\u5bb9<\/h2>\n<p>\u67d0\u5c71\u533a\u5efa\u7acb\u4e86\u4e00\u5f20\u5e94\u6025\u6551\u63f4\u8def\u7f51&#xff0c;\u8def\u7f51\u4e2d\u5171\u6709n\u4e2a\u8def\u53e3&#xff0c;\u7f16\u53f7\u4e3a1&#xff5e;n&#xff0c;\u6bcf\u4e2a\u8def\u53e3\u90fd\u6709\u5404\u81ea\u7684\u6d77\u62d4\u9ad8\u5ea6&#xff08;\u7c73&#xff09;\u3002\u6551\u63f4\u961f\u4ece1\u53f7\u8def\u53e3\u51fa\u53d1&#xff0c;\u6bcf\u5230\u4e00\u4e2a\u8def\u53e3&#xff0c;\u53ea\u80fd\u7ee7\u7eed\u8d70\u5411\u5b83\u7684\u5de6\u8def\u53e3\u6216\u53f3\u8def\u53e3&#xff0c;\u76f4\u5230\u8d70\u5230\u5de6\u53f3\u4e24\u4fa7\u90fd\u65e0\u8def\u53ef\u8d70\u7684\u8def\u53e3(\u7ec8\u70b9&#xff09;\u4e3a\u6b62&#xff0c;\u4ece1\u53f7\u8def\u53e3\u8d70\u5230\u67d0\u4e2a\u7ec8\u70b9\u7684\u884c\u8fdb\u8def\u5f84&#xff0c;\u79f0\u4e3a\u4e00\u6761\u201d\u8def\u7ebf\u201d\u3002<\/p>\n<p>\u6551\u63f4\u961f\u9700\u8981\u6743\u8861\u4e24\u65b9\u9762\u56e0\u7d20&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u8d70\u4e00\u6bb5\u8def&#xff0c;\u5982\u679c\u6d77\u62d4\u5347\u9ad8&#xff08;\u722c\u5347&#xff09;&#xff0c;\u8fd9\u4e00\u6bb5\u7684\u80fd\u8017\u4e3a\u03b1\u00d7\u9ad8\u5dee&#xff1b;\u5982\u679c\u6d77\u62d4\u964d\u4f4e&#xff08;\u4e0b\u964d&#xff09;&#xff0c;\u8fd9\u4e00\u6bb5\u7684\u80fd\u8017\u4e3a\u03b2\u00d7\u9ad8\u5dee&#xff0c;\u8fd9\u91cc\u7684\u9ad8\u5dee\u53d6\u7edd\u5bf9\u503c\u3002\u4e00\u6761\u8def\u7ebf\u7684\u603b\u80fd\u8017\u4e3a\u5404\u6bb5\u80fd\u8017\u4e4b\u548c\u3002<\/li>\n<li>\u6d77\u62d4\u6781\u5dee&#xff1a;\u4e00\u6761\u8def\u7ebf\u7ecf\u8fc7\u7684\u5168\u90e8\u8def\u53e3&#xff08;\u5305\u542b1\u53f7\u8def\u53e3&#xff09;\u4e2d&#xff0c;\u6700\u9ad8\u6d77\u62d4\u4e0e\u6700\u4f4e\u6d77\u62d4\u7684\u5dee\u503c\u4e0d\u80fd\u8d85\u8fc7\u5b89\u5168\u9600\u503c&#xff0c;\u5426 \u5219\u6c14\u538b\u53d8\u5316\u8fc7\u5927&#xff0c;\u961f\u5458\u6709\u9ad8\u539f\u53cd\u5e94\u98ce\u9669\u3002<\/li>\n<\/ul>\n<p>\u4f60\u7684\u4efb\u52a1\u662f&#xff1a;\u5728\u6240\u6709\u6d77\u62d4\u6781\u5dee\u4e0d\u8d85\u8fc7\u7684\u8def\u7ebf\u4e2d&#xff0c;\u627e\u51fa\u603b\u80fd\u8017\u6700\u5c0f\u7684\u8def\u7ebf\u3002\u82e5\u5b58\u5728\u591a\u6761\u80fd\u8017\u76f8\u540c\u7684\u8def\u7ebf&#xff0c;\u9009\u62e9\u8def\u53e3\u7f16\u53f7\u5e8f\u5217\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u90a3\u6761&#xff1a;\u6309\u987a\u5e8f\u9010\u4e2a\u6bd4\u8f83\u4e24\u6761\u5e8f\u5217\u7684\u5143\u7d20&#xff0c;\u7b2c\u4e00\u4e2a\u4e0d\u540c\u7684\u4f4d\u7f6e\u4e0a\u5143\u7d20\u66f4\u5c0f\u8005\u66f4\u5c0f&#xff1a;\u82e5\u4e00\u6761\u5e8f\u5217\u662f\u53e6\u4e00\u6761\u5e8f\u5217\u7684\u524d\u7f00&#xff0c;\u5219\u8f83\u77ed\u7684\u5e8f\u5217\u66f4\u5c0f\u3002<\/p>\n<p>\u8def\u7f51\u4fdd\u8bc1\u4ee51\u53f7\u8def\u53e3\u4e3a\u6839\u7684\u4e8c\u53c9\u6811<\/p>\n<h2>\u8f93\u5165\u63cf\u8ff0<\/h2>\n<p>n: \u8def\u53e3\u6570\u91cf(3 &lt;&#061; n &lt;&#061; 1000)<\/p>\n<p>\u03b1 \u548c \u03b2&#xff1a;\u4e0a\u5761\u4f53\u529b\u6d88\u8017\u6743\u91cd&#xff0c;\u4e0b\u964d\u4f53\u529b\u6d88\u8017\u6743\u91cd\u3002\u8303\u56f4\u4e3a[1,10]<\/p>\n<p>s: \u6d77\u62d4\u6781\u5dee\u9608\u503c(1 &lt;&#061; s &lt;&#061; 4000)<\/p>\n<p>\u63a5\u4e0b\u6765n\u884c\u6bcf\u884c\u5305\u542b4\u4e2a\u6574\u6570&#xff0c;\u5206\u522b\u8868\u793a<\/p>\n<p>id value left right<\/p>\n<ul>\n<li>id:\u8def\u53e3\u7f16\u53f7<\/li>\n<li>value:\u6d77\u62d4\u9ad8\u5ea6(0 &lt;&#061; value &lt;&#061; 10^4)<\/li>\n<li>left: \u5de6\u8def\u53e3\u7f16\u53f7&#xff0c;\u6ca1\u6709\u5219\u4e3a-1<\/li>\n<li>right:\u53f3\u8def\u53e3\u7f16\u53f7&#xff0c;\u6ca1\u6709\u5219\u4e3a-1<\/li>\n<\/ul>\n<h2>\u8f93\u51fa\u63cf\u8ff0<\/h2>\n<p>\u8fd4\u56de\u603b\u80fd\u8017\u6700\u5c0f\u7684\u8def\u7ebf\u3002\u82e5\u5b58\u5728\u591a\u6761\u80fd\u8017\u76f8\u540c\u7684\u8def\u7ebf&#xff0c;\u9009\u62e9\u8def\u53e3\u7f16\u53f7\u5e8f\u5217\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u90a3\u6761\u3002\u5982\u679c\u6ca1\u6709\u4efb\u4f55\u7ebf\u8def\u6ee1\u8db3\u8981\u6c42&#xff0c;\u8fd4\u56de\u7a7a\u3002<\/p>\n<h2>\u6837\u4f8b1<\/h2>\n<p>\u8f93\u5165<\/p>\n<p>7<br \/>\n4 2<br \/>\n500<br \/>\n1 1200 2 3<br \/>\n2 1000 4 5<br \/>\n3 1500 6 7<br \/>\n4 1250 -1 -1<br \/>\n5 600 -1 -1<br \/>\n6 1100 -1 -1<br \/>\n7 2000 -1 -1<\/p>\n<p>\u8f93\u51fa<\/p>\n<p>1 2 4<\/p>\n<h3>\u8bf4\u660e<\/h3>\n<p>\u5171\u6709\u56db\u6761\u7ebf\u8def:1,2,4 1,2,5 1,3,6 1,3,7<br \/>\n1,2,5 \u548c 1,3,7\u4e0d\u6ee1\u8db3\u6781\u5dee\u5206\u522b\u4e3a600 800<br \/>\n1,2,4\u6781\u5dee\u4e3a250&#xff0c;\u80fd\u8017\u4e3a1400<br \/>\n1,3,6\u6781\u5dee\u4e3a400&#xff0c;\u80fd\u8017\u4e3a2000<br \/>\n\u56e0\u6b64\u8fd4\u56de1,2,4<\/p>\n<h2>\u6837\u4f8b2<\/h2>\n<p>\u8f93\u5165<\/p>\n<p>3<br \/>\n2 2<br \/>\n300<br \/>\n1 500 2 3<br \/>\n2 700 -1 -1<br \/>\n3 300 -1 -1<\/p>\n<p>\u8f93\u51fa<\/p>\n<p>1 2<\/p>\n<h2>\u89e3\u9898\u601d\u8def<\/h2>\n<p>\u601d\u8def&#xff1a;\u9012\u5f52\u56de\u6eaf &#043; \u526a\u679d<\/p>\n<li>\n<p>\u4ece\u6839\u8282\u70b9 1 \u51fa\u53d1&#xff0c;\u4e00\u76f4\u8d70\u5230\u53f6\u5b50\u8282\u70b9&#xff0c;\u901a\u8fc7 DFS \u679a\u4e3e\u6240\u6709\u6839\u5230\u53f6\u5b50\u7684\u8def\u5f84&#xff0c;\u540c\u65f6\u7ef4\u62a4\u8def\u5f84\u4e0a\u7684\u6700\u9ad8\u6d77\u62d4\u3001\u6700\u4f4e\u6d77\u62d4\u548c\u7d2f\u8ba1\u80fd\u8017\u3002<\/p>\n<\/li>\n<li>\n<p>\u9012\u5f52\u56de\u6eaf\u8fc7\u7a0b\u4e2d\u7ef4\u6301\u4ee5\u4e0b\u72b6\u6001&#xff0c; \u5e76\u8bb0\u5f55\u5df2\u7ecf\u6536\u96c6\u5230\u7684\u6700\u4f73\u8def\u5f84\u4ee5\u53ca\u5bf9\u5e94\u80fd\u8017<\/p>\n<ul>\n<li>u:\u5f53\u524d\u8282\u70b9<\/li>\n<li>maxH:\u5f53\u524d\u8def\u5f84\u6700\u9ad8\u6d77\u62d4<\/li>\n<li>minH: \u5f53\u524d\u8def\u5f84\u6700\u4f4e\u6d77\u62d4<\/li>\n<li>cost : \u5f53\u524d\u8def\u5f84\u7d2f\u8ba1\u80fd\u8017<\/li>\n<li>path: \u5f53\u524d\u8def\u5f84\u7684\u8282\u70b9\u7f16\u53f7\u5e8f\u5217<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u9012\u5f52\u6bcf\u6b21\u8bbf\u95ee\u65b0\u8282\u70b9\u65f6<\/p>\n<ul>\n<li>\u66f4\u65b0\u8def\u5f84\u6700\u9ad8\u6d77\u62d4\u548c\u6700\u4f4e\u6d77\u62d4<\/li>\n<li>\u5224\u65ad\u6d77\u62d4\u6781\u5dee\u662f\u5426\u8d85\u8fc7\u9608\u503c\u3002\u5982\u679c\u8d85\u8fc7&#xff0c;\u76f4\u63a5\u526a\u679d\u3002<\/li>\n<li>\u8ba1\u7b97\u5f53\u524d\u8fb9\u7684\u80fd\u8017\u3002\u5982\u679c\u5f53\u524d\u8def\u5f84\u603b\u80fd\u8017\u8d85\u8fc7\u5f53\u524d\u6700\u4f73\u8def\u5f84\u80fd\u8017\u76f4\u63a5\u526a\u679d\u3002<\/li>\n<li>\u5982\u679c\u662f\u53f6\u5b50\u8282\u70b9&#xff0c;\u548c\u5f53\u524d\u6700\u540e\u8def\u5f84\u8fdb\u884c\u6bd4\u8f83\u5c1d\u8bd5\u66f4\u65b0\u6700\u4f18\u7b54\u6848\u3002\u5426\u5219\u7ee7\u7eed\u9012\u5f52\u5de6\u53f3\u5b50\u6811\u3002<\/li>\n<\/ul>\n<\/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;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 keyword\">using<\/span> ll <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Node<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>vector<span class=\"token operator\">&lt;<\/span>Node<span class=\"token operator\">&gt;<\/span> tree<span class=\"token punctuation\">;<\/span><\/p>\n<p>ll bestCost <span class=\"token operator\">&#061;<\/span> LLONG_MAX<span class=\"token punctuation\">;<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> bestPath<span class=\"token punctuation\">;<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> path<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6bd4\u8f83\u4e24\u6761\u8def\u7ebf&#xff0c;\u9009\u62e9\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> a<span class=\"token punctuation\">,<\/span> vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>a<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> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">!&#061;<\/span> b<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\">return<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> b<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 keyword\">return<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ DFS \u641c\u7d22\u6240\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> u<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> maxH<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> minH<span class=\"token punctuation\">,<\/span> ll cost<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u66f4\u65b0\u5f53\u524d\u8def\u5f84\u7684\u6700\u9ad8\u548c\u6700\u4f4e\u6d77\u62d4<\/span><br \/>\n    maxH <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>maxH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    minH <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>minH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d77\u62d4\u6781\u5dee\u8d85\u8fc7\u9608\u503c&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>maxH <span class=\"token operator\">&#8211;<\/span> minH <span class=\"token operator\">&gt;<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5f53\u524d\u80fd\u8017\u5df2\u7ecf\u8d85\u8fc7\u6700\u4f18\u7b54\u6848&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&gt;<\/span> bestCost<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    path<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5230\u8fbe\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&lt;<\/span> bestCost <span class=\"token operator\">||<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&#061;&#061;<\/span> bestCost <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>bestPath<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> bestPath<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            bestCost <span class=\"token operator\">&#061;<\/span> cost<span class=\"token punctuation\">;<\/span><br \/>\n            bestPath <span class=\"token operator\">&#061;<\/span> path<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        path<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8ba1\u7b97\u4e0b\u4e00\u6761\u8fb9\u7684\u80fd\u8017<\/span><br \/>\n    <span class=\"token keyword\">auto<\/span> getCost <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> v<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> ll <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> a <span class=\"token operator\">*<\/span> diff<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u5de6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> <span class=\"token function\">getCost<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u53f3\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> <span class=\"token function\">getCost<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    path<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">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> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<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> node<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    tree<span class=\"token punctuation\">.<\/span><span class=\"token function\">resize<\/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> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n        id <span class=\"token operator\">&#061;<\/span> node<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        value <span class=\"token operator\">&#061;<\/span> node<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><br \/>\n        left <span class=\"token operator\">&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<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        right <span class=\"token operator\">&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        tree<span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span>value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4ece\u6839\u8282\u70b9 1 \u5f00\u59cb\u641c\u7d22<\/span><br \/>\n    <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> bestPath<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>a<span class=\"token punctuation\">,<\/span>b<span class=\"token punctuation\">,<\/span>s<span class=\"token punctuation\">;<\/span><\/p>\n<p>    cin <span class=\"token operator\">&gt;&gt;<\/span> n<span class=\"token punctuation\">;<\/span><br \/>\n    cin <span class=\"token operator\">&gt;&gt;<\/span> a <span class=\"token operator\">&gt;&gt;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n    cin <span class=\"token operator\">&gt;&gt;<\/span>s<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> <span class=\"token function\">node<\/span><span class=\"token punctuation\">(<\/span>n<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> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n        cin <span class=\"token operator\">&gt;&gt;<\/span> id <span class=\"token operator\">&gt;&gt;<\/span> value <span class=\"token operator\">&gt;&gt;<\/span> left <span class=\"token operator\">&gt;&gt;<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n        node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span>id<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/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> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> node<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6ca1\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8f93\u51fa\u6700\u4f18\u8def\u7ebf<\/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> ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cout <span class=\"token operator\">&lt;&lt;<\/span> ans<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <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\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Node<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Node<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> value<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> left<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> right<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#061;<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;<\/span> left<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;<\/span> right<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\">static<\/span> <span class=\"token class-name\">Node<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> tree<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">long<\/span> bestCost <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">MAX_VALUE<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">List<\/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> bestPath <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\">static<\/span> <span class=\"token class-name\">List<\/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> path <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 comment\">\/\/ \u6bd4\u8f83\u4e24\u6761\u8def\u7ebf&#xff0c;\u9009\u62e9\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u8def\u7ebf<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">List<\/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> a<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">List<\/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> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>a<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> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>a<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<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\">return<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/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 keyword\">return<\/span> a<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> b<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ DFS \u641c\u7d22\u6240\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> u<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> maxH<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> minH<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> cost<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u66f4\u65b0\u5f53\u524d\u8def\u5f84\u7684\u6700\u9ad8\u548c\u6700\u4f4e\u6d77\u62d4<\/span><br \/>\n        maxH <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>maxH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        minH <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>minH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6d77\u62d4\u6781\u5dee\u8d85\u8fc7\u9608\u503c&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>maxH <span class=\"token operator\">&#8211;<\/span> minH <span class=\"token operator\">&gt;<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5f53\u524d\u80fd\u8017\u5df2\u7ecf\u8d85\u8fc7\u6700\u4f18\u7b54\u6848&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&gt;<\/span> bestCost<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        path<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5230\u8fbe\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&lt;<\/span> bestCost <span class=\"token operator\">||<\/span><br \/>\n                <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&#061;&#061;<\/span> bestCost <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>bestPath<span class=\"token punctuation\">.<\/span><span class=\"token function\">isEmpty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> bestPath<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                bestCost <span class=\"token operator\">&#061;<\/span> cost<span class=\"token punctuation\">;<\/span><br \/>\n                bestPath <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>path<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            path<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8ba1\u7b97\u4e0b\u4e00\u6761\u8fb9\u7684\u80fd\u8017<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">long<\/span> nextCost <span class=\"token operator\">&#061;<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span> a <span class=\"token operator\">*<\/span> diff <span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span> b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u5de6\u5b50\u8282\u70b9<\/span><br \/>\n            <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">long<\/span> nextCost <span class=\"token operator\">&#061;<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span> a <span class=\"token operator\">*<\/span> diff <span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span> b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u53f3\u5b50\u8282\u70b9<\/span><br \/>\n            <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        path<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">List<\/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> <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> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<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> node<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        tree <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Node<\/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>        bestCost <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">MAX_VALUE<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        bestPath <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        path <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\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> id <span class=\"token operator\">&#061;<\/span> node<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> value <span class=\"token operator\">&#061;<\/span> node<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><br \/>\n            <span class=\"token keyword\">int<\/span> left <span class=\"token operator\">&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<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> right <span class=\"token operator\">&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            tree<span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Node<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4ece\u6839\u8282\u70b9 1 \u5f00\u59cb\u641c\u7d22<\/span><br \/>\n        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> bestPath<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        <span class=\"token keyword\">int<\/span> a <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> b <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> 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><\/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> node <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 punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/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> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token 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 punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/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> ans <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> node<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6ca1\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ans<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\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/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            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8f93\u51fa\u6700\u4f18\u8def\u7ebf<\/span><br \/>\n        <span class=\"token class-name\">StringBuilder<\/span> sb <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StringBuilder<\/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;<\/span> ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/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            sb<span class=\"token punctuation\">.<\/span><span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <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>sb<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\">import<\/span> sys<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Node<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">def<\/span> <span class=\"token function\">__init__<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        self<span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#061;<\/span> value<br \/>\n        self<span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;<\/span> left<br \/>\n        self<span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;<\/span> right<\/p>\n<p>bestCost <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">float<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;inf&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nbestPath <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\npath <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\ntree <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># \u6bd4\u8f83\u4e24\u6761\u8def\u7ebf&#xff0c;\u9009\u62e9\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    length <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">min<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>length<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">!&#061;<\/span> b<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> b<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># DFS \u641c\u7d22\u6240\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">global<\/span> bestCost<span class=\"token punctuation\">,<\/span> bestPath<\/p>\n<p>    <span class=\"token comment\"># \u66f4\u65b0\u5f53\u524d\u8def\u5f84\u7684\u6700\u9ad8\u548c\u6700\u4f4e\u6d77\u62d4<\/span><br \/>\n    maxH <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span>maxH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><br \/>\n    minH <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">min<\/span><span class=\"token punctuation\">(<\/span>minH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u6d77\u62d4\u6781\u5dee\u8d85\u8fc7\u9608\u503c&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> maxH <span class=\"token operator\">&#8211;<\/span> minH <span class=\"token operator\">&gt;<\/span> s<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><\/p>\n<p>    <span class=\"token comment\"># \u5f53\u524d\u80fd\u8017\u5df2\u7ecf\u8d85\u8fc7\u6700\u4f18\u7b54\u6848&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> cost <span class=\"token operator\">&gt;<\/span> bestCost<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><\/p>\n<p>    path<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u5230\u8fbe\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token keyword\">and<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> cost <span class=\"token operator\">&lt;<\/span> bestCost <span class=\"token keyword\">or<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n            cost <span class=\"token operator\">&#061;&#061;<\/span> bestCost <span class=\"token keyword\">and<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">not<\/span> bestPath <span class=\"token keyword\">or<\/span> smaller<span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> bestPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            bestCost <span class=\"token operator\">&#061;<\/span> cost<br \/>\n            bestPath <span class=\"token operator\">&#061;<\/span> path<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>        path<span class=\"token punctuation\">.<\/span>pop<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8ba1\u7b97\u4e0b\u4e00\u6761\u8fb9\u7684\u80fd\u8017<\/span><br \/>\n    <span class=\"token comment\"># \u7ee7\u7eed\u8d70\u5411\u5de6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <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        v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left<br \/>\n        diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<br \/>\n        nextCost <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">*<\/span> diff <span class=\"token keyword\">if<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><\/p>\n<p>        dfs<span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u7ee7\u7eed\u8d70\u5411\u53f3\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <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        v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right<br \/>\n        diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<br \/>\n        nextCost <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">*<\/span> diff <span class=\"token keyword\">if<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><\/p>\n<p>        dfs<span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><\/p>\n<p>    path<span class=\"token punctuation\">.<\/span>pop<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/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> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> node<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">global<\/span> tree<span class=\"token punctuation\">,<\/span> bestCost<span class=\"token punctuation\">,<\/span> bestPath<span class=\"token punctuation\">,<\/span> path<\/p>\n<p>    tree <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token boolean\">None<\/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><br \/>\n    bestCost <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">float<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;inf&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    bestPath <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    path <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>    <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 punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token builtin\">id<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right <span class=\"token operator\">&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><br \/>\n        tree<span class=\"token punctuation\">[<\/span><span class=\"token builtin\">id<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> Node<span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u4ece\u6839\u8282\u70b9 1 \u5f00\u59cb\u641c\u7d22<\/span><br \/>\n    dfs<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> bestPath<\/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    data <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> sys<span class=\"token punctuation\">.<\/span>stdin<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">buffer<\/span><span class=\"token punctuation\">.<\/span>read<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><span class=\"token punctuation\">)<\/span><\/p>\n<p>    idx <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n    n <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">[<\/span>idx<span class=\"token punctuation\">]<\/span><br \/>\n    idx <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>    a<span class=\"token punctuation\">,<\/span> b <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">[<\/span>idx<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> data<span class=\"token punctuation\">[<\/span>idx <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    idx <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">2<\/span><\/p>\n<p>    s <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">[<\/span>idx<span class=\"token punctuation\">]<\/span><br \/>\n    idx <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>    node <span class=\"token operator\">&#061;<\/span> <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 punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        node<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">[<\/span>idx<span class=\"token punctuation\">:<\/span>idx <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        idx <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">4<\/span><\/p>\n<p>    ans <span class=\"token operator\">&#061;<\/span> solve<span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> node<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u6ca1\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> ans<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8f93\u51fa\u6700\u4f18\u8def\u7ebf<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">.<\/span>join<span class=\"token punctuation\">(<\/span><span class=\"token builtin\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">str<\/span><span class=\"token punctuation\">,<\/span> ans<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><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 punctuation\">(<\/span><span class=\"token parameter\">line<\/span><span class=\"token punctuation\">)<\/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 function\">trim<\/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><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;close&#039;<\/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><br \/>\n    <span class=\"token keyword\">const<\/span> data <span class=\"token operator\">&#061;<\/span> lines<span class=\"token punctuation\">.<\/span><span class=\"token function\">join<\/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\">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\">let<\/span> idx <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> n <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">[<\/span>idx<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> a <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">[<\/span>idx<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> b <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">[<\/span>idx<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> s <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">[<\/span>idx<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> node <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\">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;<\/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        node<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">.<\/span><span class=\"token function\">slice<\/span><span class=\"token punctuation\">(<\/span>idx<span class=\"token punctuation\">,<\/span> idx <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        idx <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">4<\/span><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> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> node<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6ca1\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">.<\/span>length <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        console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8f93\u51fa\u6700\u4f18\u8def\u7ebf<\/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 function\">join<\/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 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 comment\">\/\/ \u6bd4\u8f83\u4e24\u6761\u8def\u7ebf&#xff0c;\u9009\u62e9\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">a<span class=\"token punctuation\">,<\/span> b<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> len <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">.<\/span>length<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\">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;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">!&#061;&#061;<\/span> b<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\">return<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> b<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 keyword\">return<\/span> a<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&lt;<\/span> b<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">let<\/span> tree<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> bestCost<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> bestPath<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> path<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ DFS \u641c\u7d22\u6240\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">u<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u66f4\u65b0\u5f53\u524d\u8def\u5f84\u7684\u6700\u9ad8\u548c\u6700\u4f4e\u6d77\u62d4<\/span><br \/>\n    maxH <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>maxH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    minH <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>minH<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d77\u62d4\u6781\u5dee\u8d85\u8fc7\u9608\u503c&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>maxH <span class=\"token operator\">&#8211;<\/span> minH <span class=\"token operator\">&gt;<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5f53\u524d\u80fd\u8017\u5df2\u7ecf\u8d85\u8fc7\u6700\u4f18\u7b54\u6848&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&gt;<\/span> bestCost<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    path<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5230\u8fbe\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&lt;<\/span> bestCost <span class=\"token operator\">||<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&#061;&#061;&#061;<\/span> bestCost <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>bestPath<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> bestPath<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            bestCost <span class=\"token operator\">&#061;<\/span> cost<span class=\"token punctuation\">;<\/span><br \/>\n            bestPath <span class=\"token operator\">&#061;<\/span> path<span class=\"token punctuation\">.<\/span><span class=\"token function\">slice<\/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>        path<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\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8ba1\u7b97\u4e0b\u4e00\u6761\u8fb9\u7684\u80fd\u8017<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u5de6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> nextCost <span class=\"token operator\">&#061;<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> a <span class=\"token operator\">*<\/span> diff <span class=\"token operator\">:<\/span> b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u53f3\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">const<\/span> nextCost <span class=\"token operator\">&#061;<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> a <span class=\"token operator\">*<\/span> diff <span class=\"token operator\">:<\/span> b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    path<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/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> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> node<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    tree <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><\/p>\n<p>    bestCost <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">Infinity<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    bestPath <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    path <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\">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;<\/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\">const<\/span> <span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        tree<span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4ece\u6839\u8282\u70b9 1 \u5f00\u59cb\u641c\u7d22<\/span><br \/>\n    <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> bestPath<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 punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">type<\/span> Node <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nvalue      <span class=\"token builtin\">int<\/span><br \/>\nleft<span class=\"token punctuation\">,<\/span> right <span class=\"token builtin\">int<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">var<\/span> tree <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span>Node<br \/>\n<span class=\"token keyword\">var<\/span> bestCost <span class=\"token builtin\">int64<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token number\">63<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">var<\/span> bestPath <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><br \/>\n<span class=\"token keyword\">var<\/span> path <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6bd4\u8f83\u4e24\u6761\u8def\u7ebf&#xff0c;\u9009\u62e9\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nlength <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> length <span class=\"token punctuation\">{<\/span><br \/>\nlength <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><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;<\/span> length<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> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">!&#061;<\/span> b<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> b<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 keyword\">return<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ DFS \u641c\u7d22\u6240\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>u<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> cost <span class=\"token builtin\">int64<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u66f4\u65b0\u5f53\u524d\u8def\u5f84\u7684\u6700\u9ad8\u548c\u6700\u4f4e\u6d77\u62d4<\/span><br \/>\n<span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&gt;<\/span> maxH <span class=\"token punctuation\">{<\/span><br \/>\nmaxH <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&lt;<\/span> minH <span class=\"token punctuation\">{<\/span><br \/>\nminH <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6d77\u62d4\u6781\u5dee\u8d85\u8fc7\u9608\u503c&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n<span class=\"token keyword\">if<\/span> maxH<span class=\"token operator\">&#8211;<\/span>minH <span class=\"token operator\">&gt;<\/span> s <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5f53\u524d\u80fd\u8017\u5df2\u7ecf\u8d85\u8fc7\u6700\u4f18\u7b54\u6848&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n<span class=\"token keyword\">if<\/span> cost <span class=\"token operator\">&gt;<\/span> bestCost <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>path <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> u<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5230\u8fbe\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n<span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> cost <span class=\"token operator\">&lt;<\/span> bestCost <span class=\"token operator\">||<\/span><br \/>\n<span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&#061;&#061;<\/span> bestCost <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>bestPath<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> bestPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nbestCost <span class=\"token operator\">&#061;<\/span> cost<br \/>\nbestPath <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token function\">int<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">nil<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> path<span class=\"token operator\">&#8230;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>path <span class=\"token operator\">&#061;<\/span> path<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token keyword\">return<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8ba1\u7b97\u4e0b\u4e00\u6761\u8fb9\u7684\u80fd\u8017<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u5de6\u5b50\u8282\u70b9<\/span><br \/>\n<span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nv <span class=\"token operator\">:&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left<br \/>\ndiff <span class=\"token operator\">:&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<\/p>\n<p><span class=\"token keyword\">var<\/span> nextCost <span class=\"token builtin\">int64<\/span><br \/>\n<span class=\"token keyword\">if<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nnextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span>diff<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nnextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost<span class=\"token operator\">&#043;<\/span>nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u53f3\u5b50\u8282\u70b9<\/span><br \/>\n<span class=\"token keyword\">if<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nv <span class=\"token operator\">:&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right<br \/>\ndiff <span class=\"token operator\">:&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<\/p>\n<p><span class=\"token keyword\">var<\/span> nextCost <span class=\"token builtin\">int64<\/span><br \/>\n<span class=\"token keyword\">if<\/span> diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nnextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span>diff<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nnextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token function\">int64<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost<span class=\"token operator\">&#043;<\/span>nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>path <span class=\"token operator\">&#061;<\/span> path<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">solve<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">,<\/span> node <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 punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">int<\/span> <span class=\"token punctuation\">{<\/span><br \/>\ntree <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>Node<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>bestCost <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token number\">63<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><br \/>\nbestPath <span class=\"token operator\">&#061;<\/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 punctuation\">}<\/span><br \/>\npath <span class=\"token operator\">&#061;<\/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 punctuation\">}<\/span><\/p>\n<p><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;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nid <span class=\"token operator\">:&#061;<\/span> node<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><br \/>\nvalue <span class=\"token operator\">:&#061;<\/span> node<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><br \/>\nleft <span class=\"token operator\">:&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><br \/>\nright <span class=\"token operator\">:&#061;<\/span> node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>tree<span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> Node<span class=\"token punctuation\">{<\/span>value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4ece\u6839\u8282\u70b9 1 \u5f00\u59cb\u641c\u7d22<\/span><br \/>\n<span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> bestPath<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 \/>\nin <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><br \/>\nout <span class=\"token operator\">:&#061;<\/span> bufio<span class=\"token punctuation\">.<\/span><span class=\"token function\">NewWriter<\/span><span class=\"token punctuation\">(<\/span>os<span class=\"token punctuation\">.<\/span>Stdout<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">defer<\/span> out<span class=\"token punctuation\">.<\/span><span class=\"token function\">Flush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">var<\/span> n<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s <span class=\"token builtin\">int<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fscan<\/span><span class=\"token punctuation\">(<\/span>in<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">)<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fscan<\/span><span class=\"token punctuation\">(<\/span>in<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>b<span class=\"token punctuation\">)<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fscan<\/span><span class=\"token punctuation\">(<\/span>in<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>s<span class=\"token punctuation\">)<\/span><\/p>\n<p>node <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 punctuation\">)<\/span><\/p>\n<p><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;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nnode<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <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\">4<\/span><span class=\"token punctuation\">)<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fscan<\/span><span class=\"token punctuation\">(<\/span>in<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>node<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> <span class=\"token operator\">&amp;<\/span>node<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> <span class=\"token operator\">&amp;<\/span>node<span class=\"token punctuation\">[<\/span>i<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 operator\">&amp;<\/span>node<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><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> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> node<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6ca1\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintln<\/span><span class=\"token punctuation\">(<\/span>out<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8f93\u51fa\u6700\u4f18\u8def\u7ebf<\/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;<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>ans<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> i <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprint<\/span><span class=\"token punctuation\">(<\/span>out<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprint<\/span><span class=\"token punctuation\">(<\/span>out<span class=\"token punctuation\">,<\/span> ans<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintln<\/span><span class=\"token punctuation\">(<\/span>out<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;limits.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token keyword\">long<\/span> ll<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> Node<span class=\"token punctuation\">;<\/span><\/p>\n<p>Node <span class=\"token operator\">*<\/span>tree<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>bestPath<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>path<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> bestLen <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> pathLen <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\nll bestCost <span class=\"token operator\">&#061;<\/span> LLONG_MAX<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6bd4\u8f83\u4e24\u6761\u8def\u7ebf&#xff0c;\u9009\u62e9\u5b57\u5178\u5e8f\u8f83\u5c0f\u7684\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> lenA<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> lenB<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> lenA <span class=\"token operator\">&lt;<\/span> lenB <span class=\"token operator\">?<\/span> lenA <span class=\"token operator\">:<\/span> lenB<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">!&#061;<\/span> b<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\">return<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> b<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 keyword\">return<\/span> lenA <span class=\"token operator\">&lt;<\/span> lenB<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ DFS \u641c\u7d22\u6240\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> u<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> maxH<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> minH<span class=\"token punctuation\">,<\/span> ll cost<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u66f4\u65b0\u5f53\u524d\u8def\u5f84\u7684\u6700\u9ad8\u548c\u6700\u4f4e\u6d77\u62d4<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&gt;<\/span> maxH<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        maxH <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&lt;<\/span> minH<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        minH <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d77\u62d4\u6781\u5dee\u8d85\u8fc7\u9608\u503c&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>maxH <span class=\"token operator\">&#8211;<\/span> minH <span class=\"token operator\">&gt;<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5f53\u524d\u80fd\u8017\u5df2\u7ecf\u8d85\u8fc7\u6700\u4f18\u7b54\u6848&#xff0c;\u76f4\u63a5\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&gt;<\/span> bestCost<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    path<span class=\"token punctuation\">[<\/span>pathLen<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> u<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5230\u8fbe\u53f6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&amp;&amp;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&lt;<\/span> bestCost <span class=\"token operator\">||<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&#061;&#061;<\/span> bestCost <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n             <span class=\"token punctuation\">(<\/span>bestLen <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> <span class=\"token function\">smaller<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">,<\/span> pathLen<span class=\"token punctuation\">,<\/span> bestPath<span class=\"token punctuation\">,<\/span> bestLen<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            bestCost <span class=\"token operator\">&#061;<\/span> cost<span class=\"token punctuation\">;<\/span><br \/>\n            bestLen <span class=\"token operator\">&#061;<\/span> pathLen<span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> pathLen<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                bestPath<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> path<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>        pathLen<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8ba1\u7b97\u4e0b\u4e00\u6761\u8fb9\u7684\u80fd\u8017<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u5de6\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><\/p>\n<p>        ll nextCost<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            nextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>ll<span class=\"token punctuation\">)<\/span>a <span class=\"token operator\">*<\/span> diff<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            nextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>ll<span class=\"token punctuation\">)<\/span>b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ee7\u7eed\u8d70\u5411\u53f3\u5b50\u8282\u70b9<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> v <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> diff <span class=\"token operator\">&#061;<\/span> tree<span class=\"token punctuation\">[<\/span>v<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#8211;<\/span> tree<span class=\"token punctuation\">[<\/span>u<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">;<\/span><\/p>\n<p>        ll nextCost<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>diff <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            nextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>ll<span class=\"token punctuation\">)<\/span>a <span class=\"token operator\">*<\/span> diff<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            nextCost <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>ll<span class=\"token punctuation\">)<\/span>b <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">,<\/span> maxH<span class=\"token punctuation\">,<\/span> minH<span class=\"token punctuation\">,<\/span> cost <span class=\"token operator\">&#043;<\/span> nextCost<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    pathLen<span class=\"token operator\">&#8212;<\/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> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<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\">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>a<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    tree <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>Node <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>Node<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    bestPath <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    path <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><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> 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> id<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">,<\/span> left<span class=\"token punctuation\">,<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d %d %d %d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>id<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>value<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>left<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        tree<span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value <span class=\"token operator\">&#061;<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n        tree<span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>left <span class=\"token operator\">&#061;<\/span> left<span class=\"token punctuation\">;<\/span><br \/>\n        tree<span class=\"token punctuation\">[<\/span>id<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>right <span class=\"token operator\">&#061;<\/span> right<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4ece\u6839\u8282\u70b9 1 \u5f00\u59cb\u641c\u7d22<\/span><br \/>\n    <span class=\"token function\">dfs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> tree<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6ca1\u6709\u5408\u6cd5\u8def\u7ebf<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>bestLen <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        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8f93\u51fa\u6700\u4f18\u8def\u7ebf<\/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> bestLen<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">printf<\/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            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d&#034;<\/span><span class=\"token punctuation\">,<\/span> bestPath<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n&#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 function\">free<\/span><span class=\"token punctuation\">(<\/span>tree<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>bestPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u200b<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views &gt; p:empty:has(+ .toc),#content_views.markdown_views &gt; .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[14008,447,1889,448,552],"topic":[],"class_list":["post-122552","post","type-post","status-publish","format-standard","hentry","category-server","tag-od"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/122552.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views &gt; p:empty:has(+ .toc),#content_views.markdown_views &gt; .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/122552.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-11-04T21:32:56+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/122552.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/122552.html\",\"name\":\"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-11-04T21:32:56+00:00\",\"dateModified\":\"2026-11-04T21:32:56+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/122552.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/122552.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/122552.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/122552.html","og_locale":"zh_CN","og_type":"article","og_title":"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views &gt; p:empty:has(+ .toc),#content_views.markdown_views &gt; .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content","og_url":"https:\/\/www.wsisp.com\/helps\/122552.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-11-04T21:32:56+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"13 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/122552.html","url":"https:\/\/www.wsisp.com\/helps\/122552.html","name":"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-11-04T21:32:56+00:00","dateModified":"2026-11-04T21:32:56+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/122552.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/122552.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/122552.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"2026\u534e\u4e3aOD\u673a\u8bd5\u771f\u9898 11.1 \u65b0\u7cfb\u7edf - \u5c71\u533a\u6551\u63f4\u8def\u7ebf\u89c4\u5212"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/122552","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=122552"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/122552\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=122552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=122552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=122552"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=122552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}