{"id":408,"date":"2025-09-25T11:15:43","date_gmt":"2025-09-25T03:15:43","guid":{"rendered":"https:\/\/heyingnian.com\/?p=408"},"modified":"2025-09-25T11:16:06","modified_gmt":"2025-09-25T03:16:06","slug":"leetcode-94","status":"publish","type":"post","link":"https:\/\/heyingnian.com\/index.php\/2025\/09\/25\/leetcode-94\/","title":{"rendered":"\u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386"},"content":{"rendered":"\n

\ud83d\udd17 \u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386 <\/h1>\n\n\n\n

\u9898\u76ee\u6765\u6e90\uff1a94. \u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386 – \u529b\u6263\uff08LeetCode\uff09<\/a><\/a><\/p>\n\n\n\n

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

\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9 root<\/code>\uff0c\u8fd4\u56de\u5b83\u7684\u4e2d\u5e8f\u904d\u5386<\/strong>\u7ed3\u679c\u3002<\/p>\n\n\n\n

\u4e2d\u5e8f\u904d\u5386\u7684\u8bbf\u95ee\u987a\u5e8f\u4e3a\uff1a\u5de6\u5b50\u6811 \u2192 \u6839\u8282\u70b9 \u2192 \u53f3\u5b50\u6811<\/strong>\u3002<\/p>\n\n\n\n

\u2705 \u793a\u4f8b\u8bf4\u660e<\/p>\n\n\n\n

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

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


\u8f93\u5165\uff1aroot = [1,null,2,3]<\/code>
\u8f93\u51fa\uff1a[1,3,2]<\/code><\/p>\n\n\n\n

\u793a\u4f8b 2\uff1a
\u8f93\u5165\uff1aroot = []<\/code>
\u8f93\u51fa\uff1a[]<\/code><\/p>\n\n\n\n

\u793a\u4f8b 3\uff1a
\u8f93\u5165\uff1aroot = [1]<\/code>
\u8f93\u51fa\uff1a[1]<\/code><\/p>\n\n\n\n

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

    \n
  • \u8282\u70b9\u6570\u8303\u56f4\uff1a[0, 100]<\/code><\/li>\n\n\n\n
  • \u8282\u70b9\u503c\u8303\u56f4\uff1a[-100, 100]<\/code><\/li>\n<\/ul>\n\n\n\n

    \ud83d\udca1 \u89e3\u6cd5\uff1a\u6808\u6a21\u62df\u9012\u5f52\uff08\u8fed\u4ee3\u6cd5\uff09<\/p>\n\n\n\n

    class Solution {\n    public List<Integer> inorderTraversal(TreeNode root) {\n        List<Integer> list = new ArrayList<>();\n        LinkedList<TreeNode> stack = new LinkedList<>();\n        TreeNode curr = root;\n\n        while (curr != null || !stack.isEmpty()) {\n            if (curr != null) {\n                stack.push(curr);\n                curr = curr.left;\n            } else {\n                TreeNode node = stack.pop();\n                list.add(node.val);\n                curr = node.right;\n            }\n        }\n\n        return list;\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\u3002<\/li>\n\n\n\n
    • \u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(h)<\/strong>
      h<\/code>\u00a0\u4e3a\u6811\u7684\u9ad8\u5ea6\uff0c\u6700\u574f\u60c5\u51b5\uff08\u94fe\u72b6\u6811\uff09\u4e3a O(n)\uff0c\u5e73\u5747\u4e3a O(log n)\u3002<\/li>\n<\/ul>\n\n\n\n
      \ud83e\udde9 \u89e3\u9898\u601d\u8def<\/p>\n\n\n\n
      \u4e2d\u5e8f\u904d\u5386\u5929\u7136\u9002\u5408\u9012\u5f52\uff0c\u4f46\u9898\u76ee\u5e38\u8981\u6c42\u4e0d\u4f7f\u7528\u9012\u5f52<\/strong>\uff08\u8003\u5bdf\u6808\u7684\u8fd0\u7528\u80fd\u529b\uff09\u3002<\/p>\n\n\n\n
      \u8fed\u4ee3\u6838\u5fc3\u601d\u60f3\uff1a<\/p>\n\n\n\n
        \n
      1. \u4e00\u8def\u5411\u5de6<\/strong>\uff1a\u4ece\u5f53\u524d\u8282\u70b9\u51fa\u53d1\uff0c\u4e0d\u65ad\u5c06\u5de6\u5b50\u8282\u70b9\u538b\u5165\u6808\uff0c\u76f4\u5230\u4e3a\u7a7a\u3002<\/li>\n\n\n\n
      2. \u8bbf\u95ee\u6808\u9876<\/strong>\uff1a\u5f39\u51fa\u6808\u9876\u8282\u70b9\uff08\u5373\u5f53\u524d\u6700\u5de6\u7684\u672a\u8bbf\u95ee\u8282\u70b9\uff09\uff0c\u52a0\u5165\u7ed3\u679c\u3002<\/li>\n\n\n\n
      3. \u8f6c\u5411\u53f3\u5b50\u6811<\/strong>\uff1a\u5c06\u5f53\u524d\u6307\u9488\u6307\u5411\u8be5\u8282\u70b9\u7684\u53f3\u5b50\u6811\uff0c\u91cd\u590d\u4e0a\u8ff0\u8fc7\u7a0b\u3002<\/li>\n<\/ol>\n\n\n\n
        \u6574\u4e2a\u8fc7\u7a0b\u6a21\u62df\u4e86\u9012\u5f52\u8c03\u7528\u6808\u7684\u884c\u4e3a\uff1a<\/p>\n\n\n\n
          \n
        • \u538b\u6808 = \u9012\u5f52\u8fdb\u5165\u5de6\u5b50\u6811<\/li>\n\n\n\n
        • \u5f39\u6808 = \u56de\u6eaf\u5e76\u8bbf\u95ee\u6839<\/li>\n\n\n\n
        • \u8f6c\u53f3 = \u9012\u5f52\u5904\u7406\u53f3\u5b50\u6811<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
          \ud83d\udd17 \u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386 \u9898\u76ee\u6765\u6e90\uff1a94. \u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386 – \u529b\u6263\uff08LeetCode\uff09 \ud83d\udccc \u9898\u76ee\u63cf […]<\/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":[57,56,58,14],"class_list":["post-408","post","type-post","status-publish","format-standard","hentry","category-binary_tree","category-algorithm","tag-binary_tree","tag-stack","tag-dfs","tag-algorithm"],"_links":{"self":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/408","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=408"}],"version-history":[{"count":1,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/408\/revisions"}],"predecessor-version":[{"id":410,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/408\/revisions\/410"}],"wp:attachment":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/media?parent=408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/categories?post=408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/tags?post=408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}