{"id":102764,"date":"2026-09-09T13:08:57","date_gmt":"2026-09-09T05:08:57","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/102764.html"},"modified":"2026-09-09T13:08:57","modified_gmt":"2026-09-09T05:08:57","slug":"%e3%80%90%e4%ba%8c%e5%8f%89%e6%a0%91%e3%80%91lc-105-%e4%bb%8e%e5%89%8d%e5%ba%8f%e4%b8%8e%e4%b8%ad%e5%ba%8f%e9%81%8d%e5%8e%86%e5%ba%8f%e5%88%97%e6%9e%84%e9%80%a0%e4%ba%8c%e5%8f%89%e6%a0%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/102764.html","title":{"rendered":"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u4e00\u3001\u9898\u76ee<\/li>\n<li>\n<ul>\n<li>1\u3001\u539f\u9898\u94fe\u63a5<\/li>\n<li>2\u3001\u9898\u76ee\u63cf\u8ff0<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u7406<\/li>\n<li>\n<ul>\n<li>1\u3001\u601d\u8def\u5206\u6790<\/li>\n<li>2\u3001\u89e3\u9898\u4ee3\u7801<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u77e5\u8bc6\u98ce\u66b4<\/li>\n<\/ul>\n<h2>\u524d\u8a00<\/h2>\n<p>\u672c\u4e13\u680f\u6587\u7ae0\u4e3a\u300aLeetCode \u70ed\u9898 100\u300b\u7684\u5237\u9898\u9898\u89e3&#xff0c;\u76f8\u5173\u5185\u5bb9\u5982\u6709\u4fb5\u6743&#xff0c;\u7acb\u5373\u5220\u9664\u3002<\/p>\n<h2>\u4e00\u3001\u9898\u76ee<\/h2>\n<h3>1\u3001\u539f\u9898\u94fe\u63a5<\/h3>\n<p>105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811<\/p>\n<h3>2\u3001\u9898\u76ee\u63cf\u8ff0<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260909050856-6aa0e9e84ff19.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260909050856-6aa0e9e884bfa.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u7406<\/h2>\n<h3>1\u3001\u601d\u8def\u5206\u6790<\/h3>\n<p>\u6838\u5fc3\u662f\u5229\u7528\u524d\u5e8f\u904d\u5386\u548c\u4e2d\u5e8f\u904d\u5386\u5404\u81ea\u7684\u904d\u5386\u987a\u5e8f\u7279\u70b9&#xff0c;\u901a\u8fc7\u9012\u5f52\u5206\u6cbb\u6765\u786e\u5b9a\u6839\u8282\u70b9\u53ca\u5176\u5de6\u53f3\u5b50\u6811\u7684\u8303\u56f4\u3002 \u5177\u4f53\u6b65\u9aa4&#xff1a;<\/p>\n<li>\u786e\u5b9a\u6839\u8282\u70b9&#xff1a;\u524d\u5e8f\u904d\u5386&#xff08;Preorder&#xff09; \u7684\u987a\u5e8f\u662f [\u6839\u8282\u70b9, \u5de6\u5b50\u6811, \u53f3\u5b50\u6811]&#xff0c;\u56e0\u6b64\u5f53\u524d\u533a\u95f4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20 preorder[pre_left] \u5fc5\u7136\u662f\u5f53\u524d\u5b50\u6811\u7684\u6839\u8282\u70b9\u3002<\/li>\n<li>\u5212\u5206\u5de6\u53f3\u5b50\u6811&#xff1a;\n<ul>\n<li>\u4e2d\u5e8f\u904d\u5386&#xff08;Inorder&#xff09; \u7684\u987a\u5e8f\u662f [\u5de6\u5b50\u6811, \u6839\u8282\u70b9, \u53f3\u5b50\u6811]\u3002<\/li>\n<li>\u5728\u4e2d\u5e8f\u904d\u5386\u4e2d\u627e\u5230\u6839\u8282\u70b9\u6240\u5728\u7684\u4f4d\u7f6e\n<ul>\n<li>in_root \u540e&#xff1a;in_root \u5de6\u4fa7\u5373\u4e3a\u5de6\u5b50\u6811\u7684\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217&#xff0c;\u957f\u5ea6\u4e3a left_size &#061; in_root &#8211; in_left\u3002<\/li>\n<li>in_root \u53f3\u4fa7\u5373\u4e3a\u53f3\u5b50\u6811\u7684\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u9012\u5f52\u6784\u5efa&#xff1a;<\/li>\n<ul>\n<li>\u77e5\u9053\u4e86\u5de6\u5b50\u6811\u7684\u8282\u70b9\u6570\u91cf left_size&#xff0c;\u5c31\u53ef\u4ee5\u5728\u524d\u5e8f\u904d\u5386\u4e2d\u5207\u5206\u51fa\u5bf9\u5e94\u7684\u533a\u95f4&#xff1a;\n<ul>\n<li>\u5de6\u5b50\u6811\u7684\u524d\u5e8f\u533a\u95f4&#xff1a;[pre_left &#043; 1, pre_left &#043; left_size]<\/li>\n<li>\u5de6\u5b50\u6811\u7684\u4e2d\u5e8f\u533a\u95f4&#xff1a;[in_left, in_root &#8211; 1]<\/li>\n<li>\u53f3\u5b50\u6811\u7684\u524d\u5e8f\u533a\u95f4&#xff1a;[pre_left &#043; left_size &#043; 1, pre_right]<\/li>\n<li>\u53f3\u5b50\u6811\u7684\u4e2d\u5e8f\u533a\u95f4&#xff1a;[in_root &#043; 1, in_right]<\/li>\n<\/ul>\n<\/li>\n<li>\u9012\u5f52\u6784\u5efa\u5de6\u3001\u53f3\u5b50\u6811\u5e76\u6302\u8f7d\u5230\u6839\u8282\u70b9\u4e0a\u3002<\/li>\n<\/ul>\n<li>\u54c8\u5e0c\u8868\u52a0\u901f&#xff1a;\n<ul>\n<li>\u6bcf\u6b21\u5728\u4e2d\u5e8f\u904d\u5386\u4e2d\u7ebf\u6027\u67e5\u627e\u6839\u8282\u70b9\u8017\u65f6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>           O<\/p>\n<p>           (<\/p>\n<p>           n<\/p>\n<p>           )<\/p>\n<p>          O(n)<\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u4f1a\u5bfc\u81f4\u603b\u65f6\u95f4\u590d\u6742\u5ea6\u9000\u5316\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>           O<\/p>\n<p>           (<\/p>\n<p>            n<\/p>\n<p>            2<\/p>\n<p>           )<\/p>\n<p>          O(n^2)<\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1.0641em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>\u9884\u5148\u4f7f\u7528 unordered_map&lt;int, int&gt; \u8bb0\u5f55 inorder \u4e2d\u6bcf\u4e2a\u503c\u7684\u7d22\u5f15&#xff0c;\u53ef\u5728 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>           O<\/p>\n<p>           (<\/p>\n<p>           1<\/p>\n<p>           )<\/p>\n<p>          O(1)<\/p>\n<p>       <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span> \u65f6\u95f4\u5b9a\u4f4d\u6839\u8282\u70b9\u3002<\/li>\n<\/ul>\n<\/li>\n<h3>2\u3001\u89e3\u9898\u4ee3\u7801<\/h3>\n<p><span class=\"token comment\">\/**<br \/>\n * Definition for a binary tree node.<br \/>\n * struct TreeNode {<br \/>\n *     int val;<br \/>\n *     TreeNode *left;<br \/>\n *     TreeNode *right;<br \/>\n *     TreeNode() : val(0), left(nullptr), right(nullptr) {}<br \/>\n *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}<br \/>\n *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}<br \/>\n * };<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u54c8\u5e0c\u8868&#xff1a;\u5b58\u50a8\u4e2d\u5e8f\u904d\u5386\u4e2d \u8282\u70b9\u503c-&gt;\u6570\u7ec4\u7d22\u5f15 \u7684\u6620\u5c04&#xff0c;\u4ee5\u5b9e\u73b0O(1)\u5feb\u901f\u5b9a\u4f4d\u6839\u8282\u70b9<\/span><br \/>\n    unordered_map<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> in_pos<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/**<br \/>\n     * &#064;brief \u9012\u5f52\u6784\u9020\u4e8c\u53c9\u6811<br \/>\n     * &#064;param preorder   \u524d\u5e8f\u904d\u5386\u5e8f\u5217\u5f15\u7528<br \/>\n     * &#064;param pre_left   \u5f53\u524d\u5b50\u6811\u5728\u524d\u5e8f\u904d\u5386\u5e8f\u5217\u4e2d\u7684\u8d77\u59cb\u4e0b\u6807<br \/>\n     * &#064;param pre_right  \u5f53\u524d\u5b50\u6811\u5728\u524d\u5e8f\u904d\u5386\u5e8f\u5217\u4e2d\u7684\u7ed3\u675f\u4e0b\u6807<br \/>\n     * &#064;param inorder    \u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u5f15\u7528<br \/>\n     * &#064;param in_left    \u5f53\u524d\u5b50\u6811\u5728\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u4e2d\u7684\u8d77\u59cb\u4e0b\u6807<br \/>\n     * &#064;param in_right   \u5f53\u524d\u5b50\u6811\u5728\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u4e2d\u7684\u7ed3\u675f\u4e0b\u6807<br \/>\n     * &#064;return \u5f53\u524d\u5b50\u6811\u7684\u6839\u8282\u70b9\u6307\u9488<br \/>\n     *\/<\/span><br \/>\n    TreeNode<span class=\"token operator\">*<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> preorder<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> pre_left<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> pre_right<span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token keyword\">const<\/span> vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> inorder<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> in_left<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> in_right<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ \u9012\u5f52\u7ec8\u6b62\u6761\u4ef6&#xff1a;\u5f53\u524d\u5b50\u6811\u7684\u533a\u95f4\u4e3a\u7a7a<\/span><br \/>\n                        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pre_left <span class=\"token operator\">&gt;<\/span> pre_right <span class=\"token operator\">||<\/span> in_left <span class=\"token operator\">&gt;<\/span> in_right<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><\/p>\n<p>                        <span class=\"token comment\">\/\/ 1. \u524d\u5e8f\u904d\u5386\u7684\u7b2c\u4e00\u4e2a\u8282\u70b9\u4e3a\u5f53\u524d\u5b50\u6811\u7684\u6839\u8282\u70b9<\/span><br \/>\n                        <span class=\"token keyword\">int<\/span> root_val <span class=\"token operator\">&#061;<\/span> preorder<span class=\"token punctuation\">[<\/span>pre_left<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        TreeNode<span class=\"token operator\">*<\/span> root <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token function\">TreeNode<\/span><span class=\"token punctuation\">(<\/span>root_val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                        <span class=\"token comment\">\/\/ 2. \u5728\u4e2d\u5e8f\u904d\u5386\u4e2d\u627e\u5230\u6839\u8282\u70b9\u7d22\u5f15<\/span><br \/>\n                        <span class=\"token keyword\">int<\/span> in_root <span class=\"token operator\">&#061;<\/span> in_pos<span class=\"token punctuation\">[<\/span>root_val<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">int<\/span> left_size <span class=\"token operator\">&#061;<\/span> in_root <span class=\"token operator\">&#8211;<\/span> in_left<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u5de6\u5b50\u6811\u8282\u70b9\u6570<\/span><\/p>\n<p>                        <span class=\"token comment\">\/\/ 3. \u9012\u5f52\u6784\u5efa\u5de6\u53f3\u5b50\u6811<\/span><br \/>\n                        root<span class=\"token operator\">-&gt;<\/span>left <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span>preorder<span class=\"token punctuation\">,<\/span> pre_left <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> pre_left <span class=\"token operator\">&#043;<\/span> left_size<span class=\"token punctuation\">,<\/span> inorder<span class=\"token punctuation\">,<\/span> in_left<span class=\"token punctuation\">,<\/span> in_root <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        root<span class=\"token operator\">-&gt;<\/span>right <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span>preorder<span class=\"token punctuation\">,<\/span> pre_left <span class=\"token operator\">&#043;<\/span> left_size <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> pre_right<span class=\"token punctuation\">,<\/span> inorder<span class=\"token punctuation\">,<\/span> in_root <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> in_right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                        <span class=\"token keyword\">return<\/span> root<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    TreeNode<span class=\"token operator\">*<\/span> <span class=\"token function\">buildTree<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> preorder<span class=\"token punctuation\">,<\/span> vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> inorder<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> inorder<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u4e2d\u5e8f\u904d\u5386\u7684\u7d22\u5f15\u6620\u5c04<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            in_pos<span class=\"token punctuation\">[<\/span>inorder<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4ece\u6574\u68f5\u6811\u7684\u5168\u5c40\u533a\u95f4\u5f00\u59cb\u9012\u5f52\u6784\u5efa <\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span>preorder<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> n <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> inorder<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> n <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u590d\u6742\u5ea6\u5206\u6790<\/p>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002\u6784\u5efa\u54c8\u5e0c\u8868\u8017\u65f6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u9012\u5f52\u8bbf\u95ee\u6bcf\u4e2a\u8282\u70b9\u4e00\u6b21&#xff0c;\u6bcf\u6b21\u9012\u5f52\u5185\u90e8\u64cd\u4f5c\u5747\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          1<\/p>\n<p>          )<\/p>\n<p>         O(1)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002\u54c8\u5e0c\u8868\u5360\u7528 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span> \u7a7a\u95f4&#xff0c;\u9012\u5f52\u8c03\u7528\u6808\u6df1\u5ea6\u6700\u574f\u60c5\u51b5\u4e0b\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff08;\u94fe\u72b6\u6811&#xff09;&#xff0c;\u5e73\u8861\u72b6\u6001\u4e0b\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>          O<\/p>\n<p>          (<\/p>\n<p>          log<\/p>\n<p>          \u2061<\/p>\n<p>          n<\/p>\n<p>          )<\/p>\n<p>         O(\\\\log n)<\/p>\n<p>      <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mop\">lo<span style=\"margin-right: 0.0139em\">g<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<h2>\u4e09\u3001\u77e5\u8bc6\u98ce\u66b4<\/h2>\n<p>\u524d\u5e8f\u904d\u5386&#xff08;Preorder Traversal&#xff09; \u662f\u672c\u9898\u7684\u6838\u5fc3&#xff1a;\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811&#xff0c;\u672c\u8d28\u4e0a\u5c31\u662f\u5229\u7528\u524d\u5e8f\u904d\u5386\u786e\u5b9a\u6839\u8282\u70b9\u3001\u4e2d\u5e8f\u904d\u5386\u5212\u5206\u5de6\u53f3\u5b50\u6811&#xff0c;\u901a\u8fc7\u9012\u5f52\u5206\u6cbb\u91cd\u5efa\u6574\u68f5\u6811\u3002\u524d\u5e8f\u904d\u5386\u7684\u987a\u5e8f\u662f \u6839 -&gt; \u5de6 -&gt; \u53f3&#xff0c;\u4e2d\u5e8f\u904d\u5386\u7684\u987a\u5e8f\u662f \u5de6 -&gt; \u6839 -&gt; \u53f3&#xff0c;\u4e24\u8005\u7ed3\u5408\u5373\u53ef\u552f\u4e00\u786e\u5b9a\u4e00\u68f5\u4e8c\u53c9\u6811\u3002<\/p>\n<p>\u7b97\u6cd5\u6838\u5fc3\u601d\u60f3&#xff1a;<\/p>\n<ul>\n<li>\u524d\u5e8f\u904d\u5386\u5b9a\u6839&#xff1a;\u524d\u5e8f\u904d\u5386\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u5fc5\u7136\u662f\u5f53\u524d\u5b50\u6811\u7684\u6839\u8282\u70b9&#xff0c;\u8fd9\u662f\u9012\u5f52\u5206\u6cbb\u7684\u8d77\u70b9\u3002<\/li>\n<li>\u4e2d\u5e8f\u904d\u5386\u5212\u5206&#xff1a;\u5728\u4e2d\u5e8f\u904d\u5386\u4e2d\u627e\u5230\u6839\u8282\u70b9\u7684\u4f4d\u7f6e\u540e&#xff0c;\u5176\u5de6\u4fa7\u5373\u4e3a\u5de6\u5b50\u6811\u7684\u4e2d\u5e8f\u5e8f\u5217&#xff0c;\u53f3\u4fa7\u5373\u4e3a\u53f3\u5b50\u6811\u7684\u4e2d\u5e8f\u5e8f\u5217&#xff0c;\u4ece\u800c\u786e\u5b9a\u5de6\u53f3\u5b50\u6811\u7684\u8303\u56f4\u3002<\/li>\n<li>\u9012\u5f52\u5206\u6cbb&#xff1a;\u6839\u636e\u4e2d\u5e8f\u5212\u5206\u51fa\u7684\u5de6\u53f3\u5b50\u6811\u8282\u70b9\u6570\u91cf&#xff0c;\u5728\u524d\u5e8f\u904d\u5386\u4e2d\u5207\u5206\u51fa\u5bf9\u5e94\u7684\u5de6\u53f3\u5b50\u6811\u533a\u95f4&#xff0c;\u9012\u5f52\u6784\u5efa\u5de6\u53f3\u5b50\u6811\u5e76\u6302\u8f7d\u5230\u6839\u8282\u70b9\u4e0a\u3002<\/li>\n<\/ul>\n<p>\u5e38\u89c1\u5bf9\u6bd4&#xff1a;\u9012\u5f52 vs \u8fed\u4ee3&#xff08;\u663e\u5f0f\u6808&#xff09;<\/p>\n<ul>\n<li>\u9012\u5f52&#xff08;\u5206\u6cbb&#xff09;&#xff1a;\u8fd9\u662f\u672c\u9898\u6700\u76f4\u89c2\u7684\u89e3\u6cd5&#xff0c;\u5229\u7528\u9012\u5f52\u8c03\u7528\u6808\u5929\u7136\u4fdd\u5b58\u4e86\u56de\u6eaf\u8def\u5f84&#xff0c;\u4ee3\u7801\u7b80\u6d01\u6e05\u6670&#xff1b;\u4f46\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         O<\/p>\n<p>         (<\/p>\n<p>         h<\/p>\n<p>         )<\/p>\n<p>        O(h)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">h<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff08;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         h<\/p>\n<p>        h<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\">h<\/span><\/span><\/span><\/span><\/span> \u4e3a\u6811\u9ad8&#xff09;&#xff0c;\u6700\u574f\u60c5\u51b5\u4e0b&#xff08;\u9000\u5316\u4e3a\u94fe\u8868&#xff09;\u9012\u5f52\u6df1\u5ea6\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         O<\/p>\n<p>         (<\/p>\n<p>         n<\/p>\n<p>         )<\/p>\n<p>        O(n)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u5b58\u5728\u6808\u6ea2\u51fa\u98ce\u9669\u3002<\/li>\n<li>\u8fed\u4ee3&#xff08;\u663e\u5f0f\u6808&#xff09;&#xff1a;\u7528\u6808\u6a21\u62df\u9012\u5f52\u8fc7\u7a0b&#xff0c;\u6bcf\u6b21\u4ece\u6808\u4e2d\u53d6\u51fa\u4e00\u4e2a\u8282\u70b9\u5e76\u5904\u7406\u5176\u5de6\u53f3\u5b50\u6811\u533a\u95f4&#xff0c;\u7a7a\u95f4\u590d\u6742\u5ea6\u540c\u6837\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         O<\/p>\n<p>         (<\/p>\n<p>         n<\/p>\n<p>         )<\/p>\n<p>        O(n)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff08;\u6700\u574f\u60c5\u51b5&#xff09;&#xff0c;\u4f46\u907f\u514d\u4e86\u7cfb\u7edf\u9012\u5f52\u6808\u7684\u5f00\u9500&#xff0c;\u66f4\u53ef\u63a7\u3001\u66f4\u5b89\u5168\u3002<\/li>\n<li>\u8fed\u4ee3&#xff08;\u54c8\u5e0c\u8868\u52a0\u901f&#xff09;&#xff1a;\u8fd9\u662f\u672c\u9898\u7684\u4f18\u5316\u5173\u952e\u3002\u9884\u5148\u4f7f\u7528 unordered_map \u8bb0\u5f55\u4e2d\u5e8f\u904d\u5386\u4e2d\u6bcf\u4e2a\u503c\u7684\u7d22\u5f15&#xff0c;\u53ef\u5728 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         O<\/p>\n<p>         (<\/p>\n<p>         1<\/p>\n<p>         )<\/p>\n<p>        O(1)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span> \u65f6\u95f4\u5185\u5b9a\u4f4d\u6839\u8282\u70b9&#xff0c;\u907f\u514d\u6bcf\u6b21\u7ebf\u6027\u67e5\u627e\u5bfc\u81f4\u603b\u590d\u6742\u5ea6\u9000\u5316\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         O<\/p>\n<p>         (<\/p>\n<p>          n<\/p>\n<p>          2<\/p>\n<p>         )<\/p>\n<p>        O(n^2)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1.0641em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<p>\u54c8\u5e0c\u8868\u52a0\u901f\u601d\u60f3&#xff1a;<\/p>\n<ul>\n<li>\u6838\u5fc3\u601d\u60f3&#xff1a;\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u4e2d\u6bcf\u4e2a\u8282\u70b9\u7684\u503c\u90fd\u662f\u552f\u4e00\u7684&#xff0c;\u56e0\u6b64\u53ef\u4ee5\u9884\u5148\u5efa\u7acb \u503c -&gt; \u7d22\u5f15 \u7684\u6620\u5c04\u8868&#xff0c;\u5728\u9012\u5f52\u8fc7\u7a0b\u4e2d\u76f4\u63a5\u67e5\u8868\u5b9a\u4f4d\u6839\u8282\u70b9&#xff0c;\u65e0\u9700\u6bcf\u6b21\u904d\u5386\u67e5\u627e\u3002<\/li>\n<li>\u4e0e\u672c\u9898\u7684\u8054\u7cfb&#xff1a;\u672c\u9898\u7684\u9012\u5f52\u5206\u6cbb\u8fc7\u7a0b\u4e2d&#xff0c;\u6bcf\u6b21\u90fd\u9700\u8981\u5728\u4e2d\u5e8f\u904d\u5386\u4e2d\u5b9a\u4f4d\u6839\u8282\u70b9\u3002\u82e5\u4e0d\u4f7f\u7528\u54c8\u5e0c\u8868&#xff0c;\u6bcf\u6b21\u5b9a\u4f4d\u8017\u65f6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         O<\/p>\n<p>         (<\/p>\n<p>         n<\/p>\n<p>         )<\/p>\n<p>        O(n)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u603b\u590d\u6742\u5ea6\u9000\u5316\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         O<\/p>\n<p>         (<\/p>\n<p>          n<\/p>\n<p>          2<\/p>\n<p>         )<\/p>\n<p>        O(n^2)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1.0641em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff1b;\u4f7f\u7528\u54c8\u5e0c\u8868\u540e&#xff0c;\u6bcf\u6b21\u5b9a\u4f4d\u8017\u65f6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         O<\/p>\n<p>         (<\/p>\n<p>         1<\/p>\n<p>         )<\/p>\n<p>        O(1)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u603b\u590d\u6742\u5ea6\u4f18\u5316\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         O<\/p>\n<p>         (<\/p>\n<p>         n<\/p>\n<p>         )<\/p>\n<p>        O(n)<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>\u6ce8\u610f\u4e8b\u9879&#xff1a;\u54c8\u5e0c\u8868\u5efa\u7acb\u7684\u524d\u63d0\u662f\u8282\u70b9\u503c\u552f\u4e00\u3002\u82e5\u9898\u76ee\u5141\u8bb8\u91cd\u590d\u503c&#xff0c;\u5219\u9700\u8981\u989d\u5916\u7684\u5904\u7406\u7b56\u7565&#xff08;\u5982\u7ed3\u5408\u7d22\u5f15\u8303\u56f4\u8fdb\u4e00\u6b65\u7ea6\u675f&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u8981\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u533a\u95f4\u8fb9\u754c&#xff1a;\u9012\u5f52\u65f6\u9700\u540c\u65f6\u7ef4\u62a4\u524d\u5e8f\u548c\u4e2d\u5e8f\u7684\u5de6\u53f3\u8fb9\u754c&#xff08;pre_left\u3001pre_right\u3001in_left\u3001in_right&#xff09;&#xff0c;\u786e\u4fdd\u6bcf\u6b21\u9012\u5f52\u53ea\u5904\u7406\u5f53\u524d\u5b50\u6811\u7684\u533a\u95f4\u3002<\/li>\n<li>\u5de6\u5b50\u6811\u5927\u5c0f&#xff1a;left_size &#061; in_root &#8211; in_left \u662f\u5212\u5206\u5de6\u53f3\u5b50\u6811\u7684\u5173\u952e&#xff0c;\u5b83\u51b3\u5b9a\u4e86\u524d\u5e8f\u904d\u5386\u4e2d\u5de6\u53f3\u5b50\u6811\u533a\u95f4\u7684\u5207\u5206\u4f4d\u7f6e\u3002<\/li>\n<li>\u9012\u5f52\u7ec8\u6b62&#xff1a;\u5f53 pre_left &gt; pre_right \u6216 in_left &gt; in_right \u65f6&#xff0c;\u8bf4\u660e\u5f53\u524d\u5b50\u6811\u4e3a\u7a7a&#xff0c;\u8fd4\u56de nullptr \u4f5c\u4e3a\u8fb9\u754c\u6761\u4ef6\u7684\u515c\u5e95\u3002<\/li>\n<li>\u7a7a\u6811\u5904\u7406&#xff1a;\u82e5\u8f93\u5165\u5e8f\u5217\u4e3a\u7a7a&#xff0c;\u76f4\u63a5\u8fd4\u56de nullptr&#xff0c;\u4f5c\u4e3a\u8fb9\u754c\u6761\u4ef6\u7684\u515c\u5e95\u3002<\/li>\n<\/ul>\n<p>\u7b97\u6cd5\u53d8\u4f53\u4e0e\u6269\u5c55&#xff1a;<\/p>\n<ul>\n<li>\u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386&#xff08;LeetCode 94&#xff09;&#xff1a;\u7406\u89e3\u4e2d\u5e8f\u904d\u5386\u7684\u5e8f\u5217\u7279\u70b9\u662f\u672c\u9898\u5212\u5206\u5de6\u53f3\u5b50\u6811\u7684\u57fa\u7840\u3002<\/li>\n<li>\u4ece\u4e2d\u5e8f\u4e0e\u540e\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811&#xff08;LeetCode 106&#xff09;&#xff1a;\u4e0e\u672c\u9898\u5bf9\u79f0&#xff0c;\u5229\u7528\u540e\u5e8f\u904d\u5386\u786e\u5b9a\u6839\u8282\u70b9\u3001\u4e2d\u5e8f\u904d\u5386\u5212\u5206\u5de6\u53f3\u5b50\u6811&#xff0c;\u53ef\u5bf9\u6bd4\u7406\u89e3\u4e0d\u540c\u904d\u5386\u7ec4\u5408\u7684\u91cd\u5efa\u903b\u8f91\u3002<\/li>\n<li>\u5c06\u6709\u5e8f\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811&#xff08;LeetCode 108&#xff09;&#xff1a;\u540c\u6837\u662f\u5229\u7528\u5e8f\u5217\u5212\u5206\u9012\u5f52\u6784\u5efa\u4e8c\u53c9\u6811&#xff0c;\u53ef\u5bf9\u6bd4\u7406\u89e3\u4e0d\u540c\u6570\u636e\u6e90\u4e0b\u7684\u6784\u5efa\u7b56\u7565\u3002<\/li>\n<li>\u4e8c\u53c9\u6811\u7684\u5c42\u5e8f\u904d\u5386&#xff08;LeetCode 102&#xff09;&#xff1a;\u4e0e\u672c\u9898\u7684\u6df1\u5ea6\u4f18\u5148\u6784\u5efa\u4e0d\u540c&#xff0c;\u5c42\u5e8f\u904d\u5386\u91c7\u7528\u5e7f\u5ea6\u4f18\u5148&#xff0c;\u53ef\u5bf9\u6bd4\u7406\u89e3\u6811\u7684\u4e24\u79cd\u904d\u5386\u4e0e\u6784\u5efa\u65b9\u5f0f\u3002<\/li>\n<\/ul>\n<p>\u76f8\u5173 LeetCode \u4f8b\u9898&#xff1a;<\/p>\n<ul>\n<li>94. \u4e8c\u53c9\u6811\u7684\u4e2d\u5e8f\u904d\u5386&#xff08;\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u7279\u70b9&#xff09;<\/li>\n<li>106. \u4ece\u4e2d\u5e8f\u4e0e\u540e\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811&#xff08;\u5bf9\u79f0\u7684\u6784\u5efa\u601d\u8def&#xff09;<\/li>\n<li>108. \u5c06\u6709\u5e8f\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811&#xff08;\u5e8f\u5217\u5212\u5206\u9012\u5f52\u6784\u5efa&#xff09;<\/li>\n<li>102. \u4e8c\u53c9\u6811\u7684\u5c42\u5e8f\u904d\u5386&#xff08;\u5e7f\u5ea6\u4f18\u5148\u904d\u5386\u5bf9\u6bd4&#xff09;<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55\u524d\u8a00\u4e00\u3001\u9898\u76ee1\u3001\u539f\u9898\u94fe\u63a52\u3001\u9898\u76ee\u63cf\u8ff0\u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u74061\u3001\u601d\u8def\u5206\u67902\u3001\u89e3\u9898\u4ee3\u7801\u4e09\u3001\u77e5\u8bc6\u98ce\u66b4\u524d\u8a00 \u672c\u4e13\u680f\u6587\u7ae0\u4e3a\u300aLeetCode \u70ed\u9898 100\u300b\u7684\u5237\u9898\u9898\u89e3&#xff0c;\u76f8\u5173\u5185\u5bb9\u5982\u6709\u4fb5\u6743&#xff0c;\u7acb\u5373\u5220\u9664\u3002 \u4e00\u3001\u9898\u76ee<br \/>\n1\u3001\u539f\u9898\u94fe\u63a5 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 2\u3001\u9898\u76ee\u63cf\u8ff0 \u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u7406<br \/>\n1\u3001\u601d\u8def\u5206\u6790<br \/>\n\u6838\u5fc3\u662f\u5229\u7528\u524d\u5e8f\u904d\u5386\u548c\u4e2d\u5e8f\u904d\u5386\u5404\u81ea\u7684\u904d\u5386\u987a\u5e8f\u7279\u70b9&#xff0c;\u901a\u8fc7\u9012\u5f52\u5206\u6cbb\u6765\u786e\u5b9a\u6839\u8282\u70b9\u53ca\u5176\u5de6\u53f3\u5b50\u6811\u7684\u8303\u56f4\u3002 \u5177\u4f53\u6b65\u9aa4&#xff1a;<br \/>\n\u786e\u5b9a\u6839\u8282\u70b9<\/p>\n","protected":false},"author":2,"featured_media":102762,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4617,1813],"topic":[],"class_list":["post-102764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-4617","tag-1813"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/102764.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u76ee\u5f55\u524d\u8a00\u4e00\u3001\u9898\u76ee1\u3001\u539f\u9898\u94fe\u63a52\u3001\u9898\u76ee\u63cf\u8ff0\u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u74061\u3001\u601d\u8def\u5206\u67902\u3001\u89e3\u9898\u4ee3\u7801\u4e09\u3001\u77e5\u8bc6\u98ce\u66b4\u524d\u8a00 \u672c\u4e13\u680f\u6587\u7ae0\u4e3a\u300aLeetCode \u70ed\u9898 100\u300b\u7684\u5237\u9898\u9898\u89e3&#xff0c;\u76f8\u5173\u5185\u5bb9\u5982\u6709\u4fb5\u6743&#xff0c;\u7acb\u5373\u5220\u9664\u3002 \u4e00\u3001\u9898\u76ee 1\u3001\u539f\u9898\u94fe\u63a5 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 2\u3001\u9898\u76ee\u63cf\u8ff0 \u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u7406 1\u3001\u601d\u8def\u5206\u6790 \u6838\u5fc3\u662f\u5229\u7528\u524d\u5e8f\u904d\u5386\u548c\u4e2d\u5e8f\u904d\u5386\u5404\u81ea\u7684\u904d\u5386\u987a\u5e8f\u7279\u70b9&#xff0c;\u901a\u8fc7\u9012\u5f52\u5206\u6cbb\u6765\u786e\u5b9a\u6839\u8282\u70b9\u53ca\u5176\u5de6\u53f3\u5b50\u6811\u7684\u8303\u56f4\u3002 \u5177\u4f53\u6b65\u9aa4&#xff1a; \u786e\u5b9a\u6839\u8282\u70b9\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/102764.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-09T05:08:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260909050856-6aa0e9e84ff19.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/102764.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/102764.html\",\"name\":\"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-09-09T05:08:57+00:00\",\"dateModified\":\"2026-09-09T05:08:57+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/102764.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/102764.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/102764.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/102764.html","og_locale":"zh_CN","og_type":"article","og_title":"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6587\u7ae0\u76ee\u5f55\u524d\u8a00\u4e00\u3001\u9898\u76ee1\u3001\u539f\u9898\u94fe\u63a52\u3001\u9898\u76ee\u63cf\u8ff0\u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u74061\u3001\u601d\u8def\u5206\u67902\u3001\u89e3\u9898\u4ee3\u7801\u4e09\u3001\u77e5\u8bc6\u98ce\u66b4\u524d\u8a00 \u672c\u4e13\u680f\u6587\u7ae0\u4e3a\u300aLeetCode \u70ed\u9898 100\u300b\u7684\u5237\u9898\u9898\u89e3&#xff0c;\u76f8\u5173\u5185\u5bb9\u5982\u6709\u4fb5\u6743&#xff0c;\u7acb\u5373\u5220\u9664\u3002 \u4e00\u3001\u9898\u76ee 1\u3001\u539f\u9898\u94fe\u63a5 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 2\u3001\u9898\u76ee\u63cf\u8ff0 \u4e8c\u3001\u4e2a\u4eba\u601d\u8def\u6574\u7406 1\u3001\u601d\u8def\u5206\u6790 \u6838\u5fc3\u662f\u5229\u7528\u524d\u5e8f\u904d\u5386\u548c\u4e2d\u5e8f\u904d\u5386\u5404\u81ea\u7684\u904d\u5386\u987a\u5e8f\u7279\u70b9&#xff0c;\u901a\u8fc7\u9012\u5f52\u5206\u6cbb\u6765\u786e\u5b9a\u6839\u8282\u70b9\u53ca\u5176\u5de6\u53f3\u5b50\u6811\u7684\u8303\u56f4\u3002 \u5177\u4f53\u6b65\u9aa4&#xff1a; \u786e\u5b9a\u6839\u8282\u70b9","og_url":"https:\/\/www.wsisp.com\/helps\/102764.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-09-09T05:08:57+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260909050856-6aa0e9e84ff19.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"3 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/102764.html","url":"https:\/\/www.wsisp.com\/helps\/102764.html","name":"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-09-09T05:08:57+00:00","dateModified":"2026-09-09T05:08:57+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/102764.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/102764.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/102764.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"\u3010\u4e8c\u53c9\u6811\u3011LC 105.\u4ece\u524d\u5e8f\u4e0e\u4e2d\u5e8f\u904d\u5386\u5e8f\u5217\u6784\u9020\u4e8c\u53c9\u6811"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/102764","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=102764"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/102764\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/102762"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=102764"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=102764"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=102764"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=102764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}