{"id":416,"date":"2025-09-26T18:12:30","date_gmt":"2025-09-26T10:12:30","guid":{"rendered":"https:\/\/heyingnian.com\/?p=416"},"modified":"2025-11-28T15:18:51","modified_gmt":"2025-11-28T07:18:51","slug":"leetcode-226","status":"publish","type":"post","link":"https:\/\/heyingnian.com\/index.php\/2025\/09\/26\/leetcode-226\/","title":{"rendered":"\u7ffb\u8f6c\u4e8c\u53c9\u6811"},"content":{"rendered":"\n

\ud83d\udd17 \u7ffb\u8f6c\u4e8c\u53c9\u6811<\/h1>\n\n\n\n

\u9898\u76ee\u6765\u6e90\uff1a226. \u7ffb\u8f6c\u4e8c\u53c9\u6811 – \u529b\u6263\uff08LeetCode\uff09<\/a><\/p>\n\n\n\n

\ud83d\udccc \u9898\u76ee\u63cf\u8ff0<\/p>\n\n\n\n

\u7ed9\u4f60\u4e00\u68f5\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9 root<\/code>\uff0c\u7ffb\u8f6c\u8fd9\u68f5\u4e8c\u53c9\u6811\uff0c\u5e76\u8fd4\u56de\u5176\u6839\u8282\u70b9\u3002<\/p>\n\n\n\n

\u7ffb\u8f6c\u7684\u610f\u601d\u662f\uff1a\u5bf9\u4e8e\u6bcf\u4e2a\u8282\u70b9\uff0c\u4ea4\u6362\u5b83\u7684\u5de6\u5b50\u6811\u548c\u53f3\u5b50\u6811\u3002<\/p>\n\n\n\n

\u2705 \u793a\u4f8b\u89e3\u6790<\/p>\n\n\n\n

\u793a\u4f8b 1\uff1a<\/strong><\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u8f93\u5165\uff1aroot = [4,2,7,1,3,6,9]<\/code>
\u8f93\u51fa\uff1a[4,7,2,9,6,3,1]<\/code>
\u89e3\u91ca\uff1a\u6bcf\u4e2a\u8282\u70b9\u7684\u5de6\u53f3\u5b50\u8282\u70b9\u90fd\u88ab\u4ea4\u6362\uff0c\u4f8b\u5982 2 \u548c 7 \u4e92\u6362\uff0c1 \u548c 3 \u4e0e 6 \u548c 9 \u4e5f\u5206\u522b\u4e92\u6362\u3002<\/p>\n\n\n\n

\u793a\u4f8b 2\uff1a<\/strong><\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u8f93\u5165\uff1aroot = [2,1,3]<\/code>
\u8f93\u51fa\uff1a[2,3,1]<\/code>
\u89e3\u91ca\uff1a\u6839\u8282\u70b9 2 \u7684\u5de6\u53f3\u5b50\u8282\u70b9 1 \u548c 3 \u88ab\u4ea4\u6362\u3002<\/p>\n\n\n\n

\u793a\u4f8b 3\uff1a<\/strong><\/p>\n\n\n\n

\u8f93\u5165\uff1aroot = []<\/code>
\u8f93\u51fa\uff1a[]<\/code>
\u89e3\u91ca\uff1a\u7a7a\u6811\u7ffb\u8f6c\u540e\u4ecd\u4e3a\u7a7a\u6811\u3002<\/p>\n\n\n\n

\u26a0\ufe0f \u63d0\u793a<\/p>\n\n\n\n

    \n
  • \u6811\u4e2d\u8282\u70b9\u6570\u76ee\u8303\u56f4\u5728\u00a0[0, 100]<\/code>\u00a0\u5185<\/li>\n\n\n\n
  • -100 <= Node.val <= 100<\/code><\/li>\n<\/ul>\n\n\n\n

    \ud83d\udca1 \u89e3\u6cd5\uff1a\u9012\u5f52\uff08\u540e\u5e8f\u904d\u5386\uff09\u2014\u2014 O(n) \u65f6\u95f4\uff0cO(h) \u7a7a\u95f4<\/p>\n\n\n\n

    class Solution {\n    public TreeNode invertTree(TreeNode root) {\n        if (root == null) {\n            return null;\n        }\n        TreeNode left = invertTree(root.left);\n        TreeNode right = invertTree(root.right);\n        root.left = right;\n        root.right = left;\n        return root;\n    }\n}<\/code><\/pre>\n\n\n\n
    \ud83d\udcca \u590d\u6742\u5ea6\u5206\u6790<\/p>\n\n\n\n
      \n
    • \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n)<\/strong>
      \u6bcf\u4e2a\u8282\u70b9\u6070\u597d\u88ab\u8bbf\u95ee\u4e00\u6b21\uff0c\u603b\u5171\u6709 n \u4e2a\u8282\u70b9\uff0c\u56e0\u6b64\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(n)\u3002<\/li>\n\n\n\n
    • \u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(h)<\/strong>
      \u9012\u5f52\u8c03\u7528\u6808\u7684\u6df1\u5ea6\u7b49\u4e8e\u6811\u7684\u9ad8\u5ea6 h\u3002\u6700\u574f\u60c5\u51b5\u4e0b\uff08\u94fe\u72b6\u6811\uff09\uff0ch = n\uff1b\u6700\u597d\u60c5\u51b5\u4e0b\uff08\u5b8c\u5168\u5e73\u8861\u6811\uff09\uff0ch = log n\u3002\u56e0\u6b64\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a O(h)\u3002<\/li>\n<\/ul>\n\n\n\n
      \ud83e\udde9 \u89e3\u9898\u601d\u8def<\/p>\n\n\n\n
      \u9012\u5f52\u601d\u60f3\uff1a<\/strong>
      \u8981\u7ffb\u8f6c\u4e00\u68f5\u4e8c\u53c9\u6811\uff0c\u53ea\u9700\uff1a<\/p>\n\n\n\n
        \n
      1. \u9012\u5f52\u7ffb\u8f6c\u5de6\u5b50\u6811\uff1b<\/li>\n\n\n\n
      2. \u9012\u5f52\u7ffb\u8f6c\u53f3\u5b50\u6811\uff1b<\/li>\n\n\n\n
      3. \u5c06\u5f53\u524d\u8282\u70b9\u7684\u5de6\u3001\u53f3\u5b50\u6811\u4ea4\u6362\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
        \ud83d\udd17 \u7ffb\u8f6c\u4e8c\u53c9\u6811 \u9898\u76ee\u6765\u6e90\uff1a226. \u7ffb\u8f6c\u4e8c\u53c9\u6811 – \u529b\u6263\uff08LeetCode\uff09 \ud83d\udccc \u9898\u76ee\u63cf\u8ff0 \u7ed9\u4f60\u4e00 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,12],"tags":[57,58,14],"class_list":["post-416","post","type-post","status-publish","format-standard","hentry","category-binary_tree","category-algorithm","tag-binary_tree","tag-dfs","tag-algorithm"],"_links":{"self":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/comments?post=416"}],"version-history":[{"count":1,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/416\/revisions"}],"predecessor-version":[{"id":419,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/416\/revisions\/419"}],"wp:attachment":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/media?parent=416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/categories?post=416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/tags?post=416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}