{"id":428,"date":"2025-10-11T10:41:57","date_gmt":"2025-10-11T02:41:57","guid":{"rendered":"https:\/\/heyingnian.com\/?p=428"},"modified":"2025-10-11T10:42:24","modified_gmt":"2025-10-11T02:42:24","slug":"leetcode-108","status":"publish","type":"post","link":"https:\/\/heyingnian.com\/index.php\/2025\/10\/11\/leetcode-108\/","title":{"rendered":"\u5c06\u6709\u5e8f\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811"},"content":{"rendered":"\n

\ud83d\udd17 \u5c06\u6709\u5e8f\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811<\/h1>\n\n\n\n

\u9898\u76ee\u6765\u6e90\uff1a108. \u5c06\u6709\u5e8f\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e8c\u53c9\u641c\u7d22\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\u4e2a\u6574\u6570\u6570\u7ec4 nums<\/code>\uff0c\u5176\u4e2d\u5143\u7d20\u5df2\u7ecf\u6309 \u5347\u5e8f<\/strong> \u6392\u5217\uff0c\u8bf7\u4f60\u5c06\u5176\u8f6c\u6362\u4e3a\u4e00\u68f5 \u9ad8\u5ea6\u5e73\u8861<\/strong> \u7684\u4e8c\u53c9\u641c\u7d22\u6811\uff08BST\uff09\u3002<\/p>\n\n\n\n

\n

\u9ad8\u5ea6\u5e73\u8861\uff1a\u6bcf\u4e2a\u8282\u70b9\u7684\u5de6\u53f3\u4e24\u4e2a\u5b50\u6811\u7684\u9ad8\u5ea6\u5dee\u7684\u7edd\u5bf9\u503c\u4e0d\u8d85\u8fc7 1\u3002<\/p>\n<\/blockquote>\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\uff1anums = [-10,-3,0,5,9]<\/code>
\u8f93\u51fa\uff1a[0,-3,9,-10,null,5]<\/code>
\u89e3\u91ca\uff1a<\/p>\n\n\n\n

    \n
  • \u6839\u4e3a 0\uff08\u4e2d\u95f4\u5143\u7d20\uff09<\/li>\n\n\n\n
  • \u5de6\u5b50\u6811\u7531\u00a0[-10, -3]<\/code>\u00a0\u6784\u6210\uff0c\u53f3\u5b50\u6811\u7531\u00a0[5, 9]<\/code>\u00a0\u6784\u6210<\/li>\n\n\n\n
  • \u7ed3\u679c\u662f\u4e00\u68f5\u9ad8\u5ea6\u5e73\u8861\u7684 BST<\/li>\n<\/ul>\n\n\n\n
    \n

    \u6ce8\uff1a[0,-10,5,null,-3,null,9]<\/code> \u7b49\u5176\u4ed6\u7ed3\u6784\u53ea\u8981\u6ee1\u8db3\u5e73\u8861\u548c BST \u6027\u8d28\uff0c\u4e5f\u89c6\u4e3a\u6b63\u786e\u3002<\/p>\n\n\n\n

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

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

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

    \u8f93\u5165\uff1anums = [1,3]<\/code>
    \u8f93\u51fa\uff1a[3,1]<\/code> \u6216 [1,null,3]<\/code>
    \u89e3\u91ca\uff1a\u4e24\u79cd\u7ed3\u6784\u9ad8\u5ea6\u5dee\u5747\u4e3a 1\uff0c\u5747\u5408\u6cd5\u3002<\/p>\n\n\n\n

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

    \u8f93\u5165\uff1anums = [0]<\/code>
    \u8f93\u51fa\uff1a[0]<\/code><\/p>\n\n\n\n

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

      \n
    • 1 <= nums.length <= 10\u2074<\/code><\/li>\n\n\n\n
    • -10\u2074 <= nums[i] <= 10\u2074<\/code><\/li>\n\n\n\n
    • nums<\/code>\u00a0\u6309\u00a0\u4e25\u683c\u9012\u589e<\/strong>\u00a0\u987a\u5e8f\u6392\u5217<\/li>\n<\/ul>\n\n\n\n

      \ud83d\udca1 \u89e3\u6cd5\uff1a\u5206\u6cbb + \u9012\u5f52\uff08\u4e2d\u5e8f\u6784\u9020\uff09\u2014\u2014 O(n) \u65f6\u95f4\uff0cO(log n) \u7a7a\u95f4<\/p>\n\n\n\n

      class Solution {\n    public TreeNode sortedArrayToBST(int[] nums) {\n        return dfs(0, nums.length - 1, nums);\n    }\n\n    public TreeNode dfs(int left, int right, int[] nums) {\n        if (left > right) {\n            return null;\n        }\n        int mid = (left + right) >> 1; \n        TreeNode root = new TreeNode(nums[mid]);\n        root.left = dfs(left, mid - 1, nums);\n        root.right = dfs(mid + 1, right, nums);\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\u6570\u7ec4\u5143\u7d20\u6070\u597d\u88ab\u8bbf\u95ee\u4e00\u6b21\uff0c\u7528\u4e8e\u521b\u5efa\u4e00\u4e2a\u6811\u8282\u70b9\uff0c\u603b\u65f6\u95f4 O(n)\u3002<\/li>\n\n\n\n
      • \u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(log n)<\/strong>
        \u9012\u5f52\u8c03\u7528\u6808\u7684\u6df1\u5ea6\u7b49\u4e8e\u6811\u7684\u9ad8\u5ea6\u3002\u7531\u4e8e\u6211\u4eec\u59cb\u7ec8\u9009\u62e9\u4e2d\u70b9\uff0c\u6784\u9020\u51fa\u7684\u6811\u662f\u9ad8\u5ea6\u5e73\u8861<\/strong>\u7684\uff0c\u9ad8\u5ea6\u4e3a \u230alog\u2082n\u230b + 1<\/code>\uff0c\u56e0\u6b64\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a O(log n)\u3002
        \uff08\u4e0d\u8003\u8651\u8f93\u51fa\u6811\u672c\u8eab\u5360\u7528\u7684\u7a7a\u95f4\uff09<\/li>\n<\/ul>\n\n\n\n
        \ud83e\udde9 \u89e3\u9898\u601d\u8def<\/p>\n\n\n\n
        \u6838\u5fc3\u601d\u60f3\uff1a\u5206\u6cbb + \u4e8c\u53c9\u641c\u7d22\u6811\u6027\u8d28<\/strong><\/p>\n\n\n\n
          \n
        • \u6709\u5e8f\u6570\u7ec4\u7684\u4e2d\u70b9<\/strong>\u4f5c\u4e3a\u6839\u8282\u70b9\uff0c\u80fd\u4fdd\u8bc1\u5de6\u53f3\u5b50\u6811\u8282\u70b9\u6570\u91cf\u5c3d\u53ef\u80fd\u76f8\u7b49 \u2192 \u6ee1\u8db3\u9ad8\u5ea6\u5e73\u8861<\/strong>\u3002<\/li>\n\n\n\n
        • \u5de6\u534a\u90e8\u5206\u00a0[left, mid-1]<\/code>\u00a0\u6784\u6210\u5de6\u5b50\u6811\uff0c\u53f3\u534a\u90e8\u5206\u00a0[mid+1, right]<\/code>\u00a0\u6784\u6210\u53f3\u5b50\u6811\u3002<\/li>\n\n\n\n
        • \u9012\u5f52\u5904\u7406\u5de6\u53f3\u5b50\u6570\u7ec4\uff0c\u81ea\u7136\u6ee1\u8db3 BST \u7684\u5b9a\u4e49\uff1a\u5de6\u5b50\u6811\u6240\u6709\u503c < \u6839 < \u53f3\u5b50\u6811\u6240\u6709\u503c\u3002<\/li>\n<\/ul>\n\n\n\n
          \u4e3a\u4ec0\u4e48\u9009\u4e2d\u70b9\uff1f<\/strong><\/p>\n\n\n\n
            \n
          • \u82e5\u9009\u6700\u5de6\u6216\u6700\u53f3\uff0c\u4f1a\u9000\u5316\u4e3a\u94fe\u8868\uff08\u4e0d\u5e73\u8861\uff09\uff1b<\/li>\n\n\n\n
          • \u9009\u4e2d\u70b9\u53ef\u4f7f\u5de6\u53f3\u5b50\u6811\u5927\u5c0f\u6700\u591a\u76f8\u5dee 1\uff0c\u786e\u4fdd\u5e73\u8861\u3002<\/li>\n<\/ul>\n\n\n\n
            \u8fb9\u754c\u5904\u7406\uff1a<\/strong><\/p>\n\n\n\n
              \n
            • \u5f53\u00a0left > right<\/code>\u00a0\u65f6\uff0c\u8bf4\u660e\u5f53\u524d\u5b50\u6570\u7ec4\u4e3a\u7a7a\uff0c\u8fd4\u56de\u00a0null<\/code>\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
              \ud83d\udd17 \u5c06\u6709\u5e8f\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811 \u9898\u76ee\u6765\u6e90\uff1a108. \u5c06\u6709\u5e8f\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811 – \u529b\u6263\uff08Leet […]<\/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":[57,54,14],"class_list":["post-428","post","type-post","status-publish","format-standard","hentry","category-binary_tree","category-algorithm","tag-binary_tree","tag-divide_and_conquer","tag-algorithm"],"_links":{"self":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/428","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=428"}],"version-history":[{"count":1,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/428\/revisions"}],"predecessor-version":[{"id":432,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/428\/revisions\/432"}],"wp:attachment":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/media?parent=428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/categories?post=428"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/tags?post=428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}