{"id":937,"date":"2025-12-12T16:21:26","date_gmt":"2025-12-12T08:21:26","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=937"},"modified":"2025-12-12T16:21:26","modified_gmt":"2025-12-12T08:21:26","slug":"leetcode-543-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e7%9b%b4%e5%be%84","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=937","title":{"rendered":"LeetCode 543 \u2014 \u4e8c\u53c9\u6811\u7684\u76f4\u5f84"},"content":{"rendered":"<h1>\u9898\u76ee\u63cf\u8ff0<\/h1>\n<p>\u7ed9\u4f60\u4e00\u68f5\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9\uff0c\u8fd4\u56de\u8be5\u6811\u7684 \u76f4\u5f84 \u3002<\/p>\n<p>\u4e8c\u53c9\u6811\u7684 \u76f4\u5f84 \u662f\u6307\u6811\u4e2d\u4efb\u610f\u4e24\u4e2a\u8282\u70b9\u4e4b\u95f4\u6700\u957f\u8def\u5f84\u7684 \u957f\u5ea6 \u3002\u8fd9\u6761\u8def\u5f84\u53ef\u80fd\u7ecf\u8fc7\u4e5f\u53ef\u80fd\u4e0d\u7ecf\u8fc7\u6839\u8282\u70b9 root \u3002<\/p>\n<p>\u4e24\u8282\u70b9\u4e4b\u95f4\u8def\u5f84\u7684 \u957f\u5ea6 \u7531\u5b83\u4eec\u4e4b\u95f4\u8fb9\u6570\u8868\u793a\u3002<\/p>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.guanhaobo.cn\/wp-content\/uploads\/2025\/12\/wp_editor_md_c8f4920a7d2cf90879e4c5d7aa368be3.jpg\"><img decoding=\"async\" src=\"https:\/\/www.guanhaobo.cn\/wp-content\/uploads\/2025\/12\/wp_editor_md_c8f4920a7d2cf90879e4c5d7aa368be3.jpg\" alt=\"\" \/><\/a><\/p>\n<p>\u8f93\u5165\uff1aroot = [1,2,3,4,5]<br \/>\n\u8f93\u51fa\uff1a3<br \/>\n\u89e3\u91ca\uff1a3 \uff0c\u53d6\u8def\u5f84 [4,2,1,3] \u6216 [5,2,1,3] \u7684\u957f\u5ea6\u3002<\/p>\n<h1>\u9898\u76ee\u5206\u6790<\/h1>\n<p>\u6811\u7684\u76f4\u5f84\u662f \u6839\u8282\u70b9\u6216\u5b50\u8282\u70b9\u7684\uff08\u5de6\u5b50\u6811\u9ad8\u5ea6+\u53f3\u5b50\u6811\u9ad8\u5ea6\uff09\uff0c\u53d6\u6700\u5927\u503c\u3002\u56e0\u6b64\u4f7f\u7528\u9012\u5f52\u8ba1\u7b97\u4e00\u6b21 root \u7684\u9ad8\u5ea6\uff0c\u8fc7\u7a0b\u4e2d\u5c31\u53ef\u4ee5\u5f97\u5230\u6bcf\u4e2a\u8282\u70b9\u7684\u5de6\u5b50\u6811\u9ad8\u5ea6\u548c\u53f3\u5b50\u6811\u9ad8\u5ea6\uff0c\u7ef4\u62a4 ans \u5373\u53ef<\/p>\n<h1>Java<\/h1>\n<pre><code class=\"language-java line-numbers\">private int ans = 0;\n\npublic int diameterOfBinaryTree(TreeNode root) {\n    if (root == null) {\n        return 0;\n    }\n    ans = 0;\n    height(root);\n    return ans;\n}\n\nprivate int height(TreeNode node) {\n    if (node == null) {\n        return 0;\n    }\n    int left = height(node.left);\n    int right = height(node.right);\n    ans = Math.max(ans, left + right);\n    return Math.max(left, right) + 1;\n}\n<\/code><\/pre>\n<h1>Kotlin<\/h1>\n<pre><code class=\"language-kotlin line-numbers\">private var ans = 0\n\nfun diameterOfBinaryTree(root: TreeNode?): Int {\n    if (root == null) {\n        return 0\n    }\n    ans = 0\n    height(root)\n    return ans\n}\n\nprivate fun height(root: TreeNode?): Int {\n    if (root == null) {\n        return 0\n    }\n    val left = height(root.left)\n    val right = height(root.right)\n    ans = max(ans, left + right)\n    return max(left, right) + 1\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0 \u7ed9\u4f60\u4e00\u68f5\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9\uff0c\u8fd4\u56de\u8be5\u6811\u7684 \u76f4\u5f84 \u3002 \u4e8c\u53c9\u6811\u7684 \u76f4\u5f84 \u662f\u6307\u6811\u4e2d\u4efb\u610f\u4e24\u4e2a\u8282\u70b9\u4e4b\u95f4\u6700\u957f\u8def\u5f84\u7684 \u957f [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[20,33,64],"class_list":["post-937","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-33","tag-64"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/937","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=937"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/937\/revisions"}],"predecessor-version":[{"id":938,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/937\/revisions\/938"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}