{"id":929,"date":"2025-12-12T13:17:14","date_gmt":"2025-12-12T05:17:14","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=929"},"modified":"2025-12-12T13:17:14","modified_gmt":"2025-12-12T05:17:14","slug":"leetcode-94-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e4%b8%ad%e5%ba%8f%e9%81%8d%e5%8e%86","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=929","title":{"rendered":"LeetCode 94 \u2014 \u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386"},"content":{"rendered":"

\u9898\u76ee\u63cf\u8ff0<\/h1>\n

\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9 root \uff0c\u8fd4\u56de \u5b83\u7684 \u4e2d\u5e8f \u904d\u5386 \u3002<\/p>\n

\u793a\u4f8b\uff1a
\n\"\"<\/a>
\n\u8f93\u5165\uff1aroot = [1,null,2,3]
\n\u8f93\u51fa\uff1a[1,3,2]<\/p>\n

\u9898\u76ee\u5206\u6790<\/h1>\n

\u9012\u5f52\uff1a\u9012\u5f52\u5de6\u5b50\u6811 -> \u628a\u5f53\u524d\u7ed3\u70b9\u52a0\u5165\u5217\u8868\u4e2d -> \u9012\u5f52\u53f3\u5b50\u6811
\n\u8fed\u4ee3\uff1a\u5148\u8ba9\u5f53\u524d\u7ed3\u70b9\u5165\u6808\uff0c\u518d\u5904\u7406\u5de6\u5b50\u7ed3\u70b9\uff0c\u6700\u540e\u5904\u7406\u53f3\u5b50\u7ed3\u70b9<\/p>\n

Java<\/h1>\n
public List<Integer> inorderTraversal(TreeNode root) {\n    List<Integer> ans = new ArrayList<>();\n    if (root == null) {\n        return ans;\n    }\n    ans.addAll(inorderTraversal(root.left));\n    ans.add(root.val);\n    ans.addAll(inorderTraversal(root.right));\n    return ans;\n}\n\n\npublic List<Integer> inorderTraversal2(TreeNode root) {\n    List<Integer> ans = new ArrayList<>();\n    Deque<TreeNode> stack = new LinkedList<>();\n    TreeNode cur = root;\n    while (cur != null || !stack.isEmpty()) {\n        while (cur != null) {\n            stack.push(cur);\n            cur = cur.left;\n        }\n        cur = stack.pop();\n        ans.add(cur.val);\n        cur = cur.right;\n    }\n\n    return ans;\n}\n<\/code><\/pre>\n
Kotlin<\/h1>\n
\/\/ \u9012\u5f52\nfun inorderTraversal(root: TreeNode?): List<Int> {\n    val ans = ArrayList<Int>()\n    if (root == null) {\n        return ans\n    }\n    ans.addAll(inorderTraversal(root.left))\n    ans.add(root.`val`)\n    ans.addAll(inorderTraversal(root.right))\n    return ans\n}\n\n\/\/ \u8fed\u4ee3\n\/\/ \u4f7f\u7528\u6808\u6a21\u62df\nfun inorderTraversal2(root: TreeNode?): List<Int> {\n    val ans = ArrayList<Int>()\n    val stack = LinkedList<TreeNode>()\n    var cur = root\n    while (cur != null || !stack.isEmpty()) {\n        while (cur != null) {\n            stack.push(cur)\n            cur = cur.left\n        }\n        cur = stack.pop()\n        ans.add(cur.`val`)\n        cur = cur.right\n    }\n\n    return ans\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u63cf\u8ff0 \u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9 root \uff0c\u8fd4\u56de \u5b83\u7684 \u4e2d\u5e8f \u904d\u5386 \u3002 \u793a\u4f8b\uff1a \u8f93\u5165\uff1aroot = [1,n […]<\/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":[20,33,86,85,64],"class_list":["post-929","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-33","tag-86","tag-85","tag-64"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/929","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=929"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/929\/revisions"}],"predecessor-version":[{"id":930,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/929\/revisions\/930"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}