{"id":7512,"date":"2026-07-27T22:42:53","date_gmt":"2026-07-27T14:42:53","guid":{"rendered":"https:\/\/i007.cc\/wordpress\/?p=7512"},"modified":"2026-07-27T22:42:53","modified_gmt":"2026-07-27T14:42:53","slug":"%e7%94%a8c%e8%ae%b2%e8%ae%b2-%e6%9c%89%e5%ba%8f%e6%95%b0%e7%bb%84%e8%bd%ac%e5%b9%b3%e8%a1%a1bst-%e7%9a%84%e6%9c%80%e4%bd%b3%e6%80%9d%e8%b7%af","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/7512","title":{"rendered":"\u7528C++\u8bb2\u8bb2 \u6709\u5e8f\u6570\u7ec4\u8f6c\u5e73\u8861BST \u7684\u6700\u4f73\u601d\u8def"},"content":{"rendered":"
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C++ \u91cc\u601d\u8def\u548c\u4e4b\u524d\u8bb2\u7684\u4e00\u6837\uff0c\u6838\u5fc3\u8fd8\u662f\u5206\u6cbb\uff1a\u5229\u7528\u6570\u7ec4\u6709\u5e8f\u8fd9\u4e2a\u6027\u8d28\uff0c\u6bcf\u6b21\u53d6\u5f53\u524d\u533a\u95f4\u7684\u4e2d\u95f4\u5143\u7d20\u4f5c\u4e3a\u6839\uff0c\u4fdd\u8bc1\u5de6\u53f3\u5b50\u6811\u8282\u70b9\u6570\u6700\u591a\u76f8\u5dee 1\uff0c\u7136\u540e\u5bf9\u5de6\u53f3\u4e24\u534a\u533a\u95f4\u9012\u5f52\u6784\u9020\u3002<\/p>\n

\u5148\u7ed9\u51fa\u6807\u51c6\u7684 TreeNode \u5b9a\u4e49\u548c\u5b9e\u73b0\uff1a<\/p>\n

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cpp<\/div>\n
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struct TreeNode {\r\n    int val;\r\n    TreeNode *left;\r\n    TreeNode *right;\r\n    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}\r\n};\r\n\r\nclass Solution {\r\npublic:\r\n    TreeNode* sortedArrayToBST(vector<int>& nums) {\r\n        return build(nums, 0, (int)nums.size() - 1);\r\n    }\r\n\r\nprivate:\r\n    TreeNode* build(vector<int>& nums, int left, int right) {\r\n        if (left > right) return nullptr;\r\n        int mid = left + (right - left) \/ 2;\r\n        TreeNode* node = new TreeNode(nums[mid]);\r\n        node->left = build(nums, left, mid - 1);\r\n        node->right = build(nums, mid + 1, right);\r\n        return node;\r\n    }\r\n};<\/pre>\n
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\u51e0\u4e2a C++ \u91cc\u9700\u8981\u7559\u610f\u7684\u70b9\uff1a<\/p>\n
mid \u7528 left + (right - left) \/ 2<\/code> \u800c\u4e0d\u662f (left + right) \/ 2<\/code>\uff0c\u662f\u4e3a\u4e86\u907f\u514d left\u3001right \u90fd\u5f88\u5927\u65f6\u76f8\u52a0\u6ea2\u51fa int\uff0c\u8fd9\u5728 C++ \u91cc\u662f\u9700\u8981\u663e\u5f0f\u6ce8\u610f\u7684\uff0c\u4e0d\u50cf\u67d0\u4e9b\u8bed\u8a00\u6709\u5927\u6570\u4fdd\u62a4\u3002<\/p>\n
\u9012\u5f52\u53c2\u6570\u4f20\u7684\u662f vector \u7684\u5f15\u7528\uff08vector<int>&<\/code>\uff09\uff0c\u907f\u514d\u6bcf\u5c42\u9012\u5f52\u90fd\u62f7\u8d1d\u4e00\u4efd\u6570\u7ec4\uff0c\u8fd9\u5728 C++ \u91cc\u5bf9\u6027\u80fd\u5f71\u54cd\u6bd4\u8f83\u660e\u663e\uff0c\u5c24\u5176\u6570\u7ec4\u8f83\u5927\u65f6\u3002<\/p>\n
\u5185\u5b58\u7ba1\u7406\u4e0a\uff0c\u8fd9\u91cc\u7528 new \u521b\u5efa\u8282\u70b9\u540e\u4e0d\u505a\u624b\u52a8 delete\uff0c\u662f\u56e0\u4e3a\u6784\u9020\u51fa\u7684\u6811\u662f\u8981\u8fd4\u56de\u7ed9\u8c03\u7528\u8005\u6301\u6709\u7684\uff0c\u751f\u547d\u5468\u671f\u7531\u8c03\u7528\u8005\u8d1f\u8d23\uff1b\u5982\u679c\u8fd9\u662f\u8981\u5728\u51fd\u6570\u5185\u90e8\u4e34\u65f6\u7528\u4e00\u4e0b\u5c31\u4e22\u5f03\u7684\u573a\u666f\uff0c\u624d\u9700\u8981\u8003\u8651\u7528 unique_ptr<TreeNode><\/code> \u6216\u624b\u52a8\u91ca\u653e\uff0c\u9632\u6b62\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n
\u5173\u4e8e\u5076\u6570\u957f\u5ea6\u533a\u95f4\u53d6\u5de6\u4e2d\u70b9\u8fd8\u662f\u53f3\u4e2d\u70b9\uff08left + (right - left) \/ 2<\/code> \u662f\u53d6\u5de6\u4e2d\u70b9\uff0c\u5982\u679c\u60f3\u53d6\u53f3\u4e2d\u70b9\u7528 left + (right - left + 1) \/ 2<\/code>\uff09\uff0c\u4e24\u79cd\u5199\u6cd5\u6784\u9020\u51fa\u7684\u6811\u5f62\u72b6\u4e0d\u540c\u4f46\u90fd\u5e73\u8861\uff0c\u4e00\u822c\u9898\u76ee\u4e0d\u9650\u5b9a\u5177\u4f53\u53d6\u54ea\u4e00\u4e2a\u3002<\/p>\n
\u590d\u6742\u5ea6\u4e0a\uff0c\u65f6\u95f4\u662f O(n)\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u5143\u7d20\u6070\u597d\u88ab\u8bbf\u95ee\u4e00\u6b21\u5e76\u521b\u5efa\u4e00\u4e2a\u8282\u70b9\uff1b\u7a7a\u95f4\u4e0a\u9664\u53bb\u8f93\u51fa\u6811\u672c\u8eab\uff0c\u989d\u5916\u7528\u7684\u662f\u9012\u5f52\u8c03\u7528\u6808\uff0c\u6df1\u5ea6\u662f O(log n)\uff0c\u56e0\u4e3a\u6bcf\u6b21\u533a\u95f4\u957f\u5ea6\u51cf\u534a\u3002<\/p>\n
\u5982\u679c\u6570\u7ec4\u89c4\u6a21\u975e\u5e38\u5927\uff0c\u62c5\u5fc3\u9012\u5f52\u6808\u6ea2\u51fa\uff08C++ \u9ed8\u8ba4\u6808\u7a7a\u95f4\u6bd4\u5806\u5c0f\u5f88\u591a\uff09\uff0c\u53ef\u4ee5\u6539\u6210\u8fed\u4ee3\u7248\u672c\uff0c\u7528\u4e00\u4e2a\u663e\u5f0f\u6808\u5b58\u50a8 (left, right, \u7236\u8282\u70b9\u6307\u9488, \u662f\u5de6\u5b69\u5b50\u8fd8\u662f\u53f3\u5b69\u5b50) \u8fd9\u6837\u7684\u4e09\u5143\u7ec4\/\u7ed3\u6784\u4f53\uff0c\u624b\u52a8\u6a21\u62df\u9012\u5f52\u8fc7\u7a0b\uff0c\u628a\u9012\u5f52\u6df1\u5ea6\u7684\u9650\u5236\u8f6c\u79fb\u5230\u5806\u5185\u5b58\u4e0a\uff0c\u8fd9\u5728\u5904\u7406\u8d85\u5927\u6570\u636e\u96c6\u65f6\u662f\u66f4\u7a33\u59a5\u7684\u5199\u6cd5\uff0c\u4f46\u4ee3\u7801\u4f1a\u590d\u6742\u4e0d\u5c11\uff0c\u4e00\u822c\u7b14\u8bd5\u9762\u8bd5\u573a\u666f\u5199\u9012\u5f52\u7248\u672c\u5c31\u8db3\u591f\u4e86\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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C++ \u91cc\u601d\u8def\u548c\u4e4b\u524d\u8bb2\u7684\u4e00\u6837\uff0c\u6838\u5fc3\u8fd8\u662f\u5206<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[24],"tags":[],"class_list":["post-7512","post","type-post","status-publish","format-standard","hentry","category-value_docs"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/7512","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=7512"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/7512\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=7512"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=7512"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=7512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}