{"id":931,"date":"2025-12-12T13:48:25","date_gmt":"2025-12-12T05:48:25","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=931"},"modified":"2025-12-12T13:48:25","modified_gmt":"2025-12-12T05:48:25","slug":"leetcode-104-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e6%9c%80%e5%a4%a7%e6%b7%b1%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=931","title":{"rendered":"LeetCode 104 \u2014 \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6"},"content":{"rendered":"<h1>\u9898\u76ee\u63cf\u8ff0<\/h1>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811 root \uff0c\u8fd4\u56de\u5176\u6700\u5927\u6df1\u5ea6\u3002<br \/>\n\u4e8c\u53c9\u6811\u7684 \u6700\u5927\u6df1\u5ea6 \u662f\u6307\u4ece\u6839\u8282\u70b9\u5230\u6700\u8fdc\u53f6\u5b50\u8282\u70b9\u7684\u6700\u957f\u8def\u5f84\u4e0a\u7684\u8282\u70b9\u6570\u3002<\/p>\n<h1>\u9898\u76ee\u5206\u6790<\/h1>\n<p>\u9012\u5f52\uff1a\u5de6\u5b50\u6811\u6df1\u5ea6 \u548c \u53f3\u5b50\u6811\u6df1\u5ea6 \u4e2d\u53d6\u6700\u5927\u503c\uff0c\u518d + 1<br \/>\n\u8fed\u4ee3\uff1a\u4f7f\u7528\u961f\u5217\u5b58\u50a8\u7ed3\u70b9\uff0c\u8bb0\u5f55\u6bcf\u5c42\u7ed3\u70b9\u6570\uff0c\u4ece\u800c\u5b9e\u73b0\u6bcf\u5c42\u540c\u65f6\u51fa\u961f\u5217\uff0c\u6bcf\u51fa\u4e00\u5c42\u5c31\u8ba9\u7ed3\u679c + 1<\/p>\n<h1>Java<\/h1>\n<pre><code class=\"language-java line-numbers\">\/\/ \u9012\u5f52\npublic int maxDepth(TreeNode root) {\n    if (root == null) {\n        return 0;\n    }\n    return Math.max(maxDepth(root.left), maxDepth(root.right)) + 1;\n}\n\n\/\/ \u8fed\u4ee3\npublic int maxDepth2(TreeNode root) {\n    Queue&lt;TreeNode&gt; queue = new LinkedList&lt;&gt;();\n    int ans = 0;\n    if (root == null) {\n        return ans;\n    }\n    queue.offer(root);\n    while (!queue.isEmpty()) {\n        int size = queue.size();\n        while (size &gt; 0) {\n            TreeNode node = queue.poll();\n            if (node.left != null) {\n                queue.offer(node.left);\n            }\n            if (node.right != null) {\n                queue.offer(node.right);\n            }\n            size--;\n        }\n        ans++;\n    }\n    return ans;\n}\n<\/code><\/pre>\n<h1>Kotlin<\/h1>\n<pre><code class=\"language-kotlin line-numbers\">fun maxDepth(root: TreeNode?): Int {\n    if (root == null) {\n        return 0\n    }\n    return max(maxDepth(root.left), maxDepth(root.right)) + 1\n}\n\nfun maxDepth2(root: TreeNode?): Int {\n    var ans = 0\n    if (root == null) {\n        return ans\n    }\n    val queue = LinkedList&lt;TreeNode&gt;()\n    queue.offer(root)\n    while (!queue.isEmpty()) {\n        var size = queue.size\n        while (size &gt; 0) {\n            val node = queue.poll()\n            node.left?.let {\n                queue.offer(it)\n            }\n            node.right?.let {\n                queue.offer(it)\n            }\n            size--\n        }\n        ans++\n    }\n    return ans\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0 \u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811 root \uff0c\u8fd4\u56de\u5176\u6700\u5927\u6df1\u5ea6\u3002 \u4e8c\u53c9\u6811\u7684 \u6700\u5927\u6df1\u5ea6 \u662f\u6307\u4ece\u6839\u8282\u70b9\u5230\u6700\u8fdc\u53f6\u5b50\u8282\u70b9\u7684\u6700\u957f\u8def [&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":[20,33,85,64,87],"class_list":["post-931","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-33","tag-85","tag-64","tag-87"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/931","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=931"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/931\/revisions"}],"predecessor-version":[{"id":932,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/931\/revisions\/932"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}