{"id":1599,"date":"2019-08-19T15:23:51","date_gmt":"2019-08-19T07:23:51","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=1599"},"modified":"2019-08-19T15:35:28","modified_gmt":"2019-08-19T07:35:28","slug":"pt07z","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/pt07z\/","title":{"rendered":"PT07Z"},"content":{"rendered":"<p>\u6279\u6539 <a href=\"https:\/\/xiaotiandada.github.io\/2019\/08\/19\/dfs-\u6df1\u5ea6\u4f18\u5148\u641c\u7d22\u3010js\u3011\">\u4f5c\u4e1a<\/a> \u65f6\u95f4\u3002\u663e\u7136\u6709\u4e24\u4e2a\u95ee\u9898\uff1a<br \/>\n&#8211; \u6570\u636e\u6ca1\u6709\u4ece IO \u8bfb\u5165\u8bfb\u51fa\u3002<br \/>\n&#8211; \u7b2c\u4e00\u4e2a dfs \u6c42\u51fa\u7684\u4e0d\u662f\u6700\u8fdc\u7684\u7aef\u70b9\u3002<\/p>\n<p>\u4e0d\u8fc7\u6211\u4fee\u6539\u4e86\u4e4b\u540e\u76ee\u524d\u4f9d\u7136\u6ca1\u6709\u901a\u8fc7 SPOJ \u7684\u6d4b\u8bd5\u3002\u652f\u6301 Javascript \u7684 OJ \u4e5f\u5f88\u5c11\uff0c<br \/>\nCodeforces \u4e0a Javascript \u7684\u63d0\u4ea4\u4e5f\u8fdc\u4e0d\u5982\u5176\u4ed6\u8bed\u8a00\u3002<br \/>\n\u5982\u4f55\u5728 SPOJ \u63d0\u4ea4 Javascript\uff1f<a href=\"http:\/\/discuss.spoj.com\/t\/javascript-test-solution\/4483\">\u8fd9\u4e2a\u94fe\u63a5<\/a> \u4e0b\u9762\u9644\u4e86\u4e00\u4e2a <a href=\"https:\/\/www.spoj.com\/problems\/TEST\/\">Life, the Universe, and Everything<\/a> \u7684 JS \u6807\u7a0b\u3002<\/p>\n<pre class=\"brush: jscript; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\nlet vertexLen = parseInt(readline().trim()); \/\/ \u9876\u70b9\u6570\r\nlet vertex = new Map(); \/\/ \u9876\u70b9\u6570\u636e\u96c6\u5408 map \u53ef\u4ee5\u8bbe\u7f6e\u952e\u5bf9\u503c 0 1 2 3 4 5 or 1 2 3 4 5 6 or A B C D E F G ... ...\r\n\r\n\/**\r\n * \u8bbe\u7f6e\u9876\u70b9\r\n * @param {String || Number} v \u9876\u70b9\r\n *\/\r\nconst setVertex = v =&gt; vertex.set(v, &#x5B;]);\r\n\/**\r\n * \u8bbe\u7f6e\u8fb9\r\n * @param {String || Number} v1 \u70b9\r\n * @param {String || Number} v2 \u70b9\r\n *\/\r\nconst setVertexEdge = (v1, v2) =&gt; {\r\n  vertex.get(v1).push(v2);\r\n  vertex.get(v2).push(v1);\r\n};\r\n\r\n\/\/ \u8bbe\u7f6e\u70b9\r\nfor (let i = 1; i &lt;= vertexLen; i++) setVertex(i);\r\n\r\n\/\/ \u5b9a\u4e49\u8fb9\r\nlet vertexEdge = &#x5B;&#x5B;1, 4], &#x5B;2, 4], &#x5B;3, 4], &#x5B;4, 5], &#x5B;5, 6]];\r\n\r\n\/\/ \u8bbe\u7f6e\u8fb9\r\n\/\/ for (let i = 0; i &lt; vertexEdge.length; i++)\r\n\/\/   setVertexEdge(vertexEdge&#x5B;i]&#x5B;0], vertexEdge&#x5B;i]&#x5B;1]);\r\nfor (let i = 0; i &lt; vertexLen - 1; i++) {\r\n    var edge = readline().trim().split(&quot; &quot;).map(function(x) { return parseInt(x); });\r\n    setVertexEdge(edge&#x5B;0], edge&#x5B;1]);\r\n}\r\n\r\n\r\n\/**\r\n * dfs\r\n * @param {String || Number} startNode \u5f00\u59cb\u70b9\r\n *\/\r\nconst dfs = startNode =&gt; {\r\n  let visited = new Map(); \/\/ \u4fdd\u6301\u548c\u9876\u70b9\u7ed3\u6784\u4e00\u6837\r\n  let f = startNode;\r\n  let z = 0;\r\n  for (let i = 1; i &lt;= vertexLen; i++) visited.set(i, false); \/\/ \u8bbe\u7f6e\u8bbf\u95ee\u72b6\u6001\r\n\r\n  \/\/ dfs \u65b9\u6cd5\r\n  const dfsFunc = (startNode, visited, dep) =&gt; {\r\n    if (dep &gt; z) {\r\n        f = startNode;\r\n        z = dep;\r\n    }\r\n    dep += 1;\r\n    visited.set(startNode, true); \/\/ \u7b2c\u4e00\u4e2a\u70b9\u8bbe\u7f6e\u5df2\u8bbf\u95ee\r\n    let get_next = vertex.get(startNode); \/\/ \u83b7\u5f97\u9876\u70b9\u7684\u6240\u6709\u4e34\u63a5\u70b9\r\n    for (let i = 0; i &lt; get_next.length; i++) {\r\n      \/\/ \u5faa\u73af\u4e34\u63a5\u70b9\r\n      let get_elem = get_next&#x5B;i]; \/\/ \u5f97\u5230\u5143\u7d20\r\n      if (!visited.get(get_elem)) {\r\n        dfsFunc(get_elem, visited, dep);\r\n      }      \r\n    }\r\n    return z;\r\n  };\r\n  dfsFunc(startNode, visited, 0);\r\n  return f;\r\n};\r\n\r\n\/**\r\n * dfs\r\n * @param {String || Number} startNode \u5f00\u59cb\u70b9\r\n *\/\r\nconst dfs1 = startNode =&gt; {\r\n  \/\/ \u8bb0\u5f55\u5f00\u59cb\u70b9\u548c\u7236\u7ea7\u8282\u70b9\r\n  const dfsFunc = (startNode, parentNode = -1) =&gt; {\r\n    let z = 0; \/\/ \u8bb0\u5f55\u957f\u5ea6\r\n    let get_next = vertex.get(startNode); \/\/ \u5f97\u5230\u76f8\u90bb\u8282\u70b9\r\n    for (let i = 0; i &lt; get_next.length; i++) { \/\/ \u5faa\u73af\u70b9\r\n      let get_elem = get_next&#x5B;i]; \/\/ \u5f97\u5230\u70b9\r\n      if (get_elem === parentNode) continue; \/\/ \u5982\u679c\u662f\u7236\u8282\u70b9 \u8df3\u8fc7\r\n      z = Math.max(z, dfsFunc(get_elem, startNode) + 1); \/\/ \u9012\u5f52\u6dfb\u52a0\u957f\u5ea6\r\n    }\r\n    return z;\r\n  };\r\n  return dfsFunc(startNode);\r\n};\r\n\r\nlet z = dfs(1);\r\n\r\n\/\/ console.log(z);\r\n\r\nlet z1 = dfs1(1);\r\n\/\/ console.log(z1);\r\n\r\nprint(z1);\r\n\r\n\/\/ console.log(vertex);\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6279\u6539 \u4f5c\u4e1a \u65f6\u95f4\u3002\u663e\u7136\u6709\u4e24\u4e2a\u95ee\u9898\uff1a &#8211; \u6570\u636e\u6ca1\u6709\u4ece IO \u8bfb\u5165\u8bfb\u51fa\u3002 &#8211; \u7b2c\u4e00\u4e2a dfs \u6c42\u51fa\u7684\u4e0d\u662f\u6700\u8fdc\u7684\u7aef\u70b9\u3002 \u4e0d\u8fc7\u6211\u4fee\u6539\u4e86\u4e4b\u540e\u76ee\u524d\u4f9d\u7136\u6ca1\u6709\u901a\u8fc7 SPOJ \u7684\u6d4b\u8bd5\u3002\u652f\u6301 Javascript \u7684 OJ \u4e5f\u5f88\u5c11\uff0c Codeforces \u4e0a Javascript \u7684\u63d0\u4ea4\u4e5f\u8fdc\u4e0d\u5982\u5176\u4ed6\u8bed\u8a00\u3002 \u5982\u4f55\u5728 SPOJ \u63d0\u4ea4 Javascript\uff1f\u8fd9\u4e2a\u94fe\u63a5 \u4e0b\u9762\u9644\u4e86\u4e00\u4e2a Life, the Universe, and Everything \u7684 JS \u6807\u7a0b\u3002 let vertexLen = parseInt(readline().trim()); \/\/ \u9876\u70b9\u6570 let vertex = new Map(); \/\/ \u9876\u70b9\u6570\u636e\u96c6\u5408 map \u53ef\u4ee5\u8bbe\u7f6e\u952e\u5bf9\u503c 0 1 2 3 4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[1],"tags":[],"class_list":["post-1599","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/s2tdP7-pt07z","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1599","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/comments?post=1599"}],"version-history":[{"count":1,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1599\/revisions"}],"predecessor-version":[{"id":1600,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1599\/revisions\/1600"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=1599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=1599"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=1599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}