{"id":71539,"date":"2026-02-03T22:16:35","date_gmt":"2026-02-03T14:16:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/71539.html"},"modified":"2026-02-03T22:16:35","modified_gmt":"2026-02-03T14:16:35","slug":"%e7%ae%97%e6%b3%95%e8%ae%ad%e7%bb%83%e8%90%a5%e7%ac%ac%e5%8d%81%e4%b8%89%e5%a4%a9%ef%bc%9a%e4%ba%8c%e5%8f%89%e6%a0%91%e5%9f%ba%e7%a1%80","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/71539.html","title":{"rendered":"\u7b97\u6cd5\u8bad\u7ec3\u8425\u7b2c\u5341\u4e09\u5929\uff1a\u4e8c\u53c9\u6811\u57fa\u7840"},"content":{"rendered":"<\/p>\n<h4>\u7b97\u6cd5\u8bad\u7ec3\u8425\u7b2c\u5341\u4e09\u5929|<\/h4>\n<ul>\n<li>\u4e8c\u53c9\u6811\u7406\u8bba\u57fa\u7840<\/li>\n<li>\u4e8c\u53c9\u6811\u7684\u9012\u5f52\u904d\u5386<\/li>\n<li>\n<ul>\n<li>\u5361\u54e5\u6587\u5b57\u4ee5\u53ca\u89c6\u9891\u8bb2\u89e3\u94fe\u63a5<\/li>\n<li>\n<ul>\n<li>\u91cd\u70b9<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0&#xff08;\u524d\u5e8f\u904d\u5386&#xff09;\u4e2d&#xff0c;\u5de6&#xff0c;\u53f3<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0&#xff08;\u4e2d\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u4e2d&#xff0c;\u53f3<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0&#xff08;\u540e\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u53f3&#xff0c;\u4e2d<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u53c9\u6811\u7684\u8fed\u4ee3\u904d\u5386<\/li>\n<li>\n<ul>\n<li>\u5361\u54e5\u6587\u5b57\u4ee5\u53ca\u89c6\u9891\u8bb2\u89e3\u94fe\u63a5<\/li>\n<li>\n<ul>\n<li>\u91cd\u70b9<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0&#xff08;\u524d\u5e8f\u904d\u5386&#xff09;\u4e2d&#xff0c;\u5de6&#xff0c;\u53f3<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0&#xff08;\u4e2d\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u4e2d&#xff0c;\u53f3<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0&#xff08;\u540e\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u53f3&#xff0c;\u4e2d<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u53c9\u6811\u7684\u7edf\u4e00\u8fed\u4ee3\u6cd5<\/li>\n<li>\n<ul>\n<li>\u5361\u54e5\u6587\u5b57\u4ee5\u53ca\u89c6\u9891\u8bb2\u89e3\u94fe\u63a5<\/li>\n<li>\n<ul>\n<li>\u91cd\u70b9<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0 &#xff08;\u524d\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528null\u8868\u793a\u4f7f\u7528<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0 (\u4e2d\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528null\u8868\u793a\u4f7f\u7528<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0 (\u540e\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528null\u8868\u793a\u4f7f\u7528<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0 (\u4e2d\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528 pair \u643a\u5e26\u4e00\u4e2abool\u6765\u786e\u5b9a\u5143\u7d20\u72b6\u6001<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u53c9\u6811\u5c42\u5e8f\u904d\u5386<\/li>\n<li>\n<ul>\n<li>\u5361\u54e5\u6587\u5b57\u4ee5\u53ca\u89c6\u9891\u8bb2\u89e3\u94fe\u63a5<\/li>\n<li>\n<ul>\n<li>\u91cd\u70b9<\/li>\n<li>c&#043;&#043;\u5b9e\u73b0<\/li>\n<\/ul>\n<\/li>\n<li>\u4e00\u4e2a\u91cd\u70b9<\/li>\n<\/ul>\n<\/li>\n<li>\u575a\u6301\u5c31\u662f\u80dc\u5229<\/li>\n<\/ul>\n<h2>\u4e8c\u53c9\u6811\u7406\u8bba\u57fa\u7840<\/h2>\n<ul>\n<li>\u4e8c\u53c9\u6811\u7c7b\u578b\u6709&#xff1a;\u6ee1\u4e8c\u53c9\u6811\u3001\u5b8c\u5168\u4e8c\u53c9\u6811\u3001\u4e8c\u53c9\u641c\u7d22\u6811\u548c\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\u3002<\/li>\n<li>\u5b58\u50a8\u65b9\u5f0f\u6709&#xff1a;\u94fe\u5f0f\u5b58\u50a8&#xff08;\u6307\u9488&#xff09;\u548c\u987a\u5e8f\u5b58\u50a8&#xff08;\u6570\u7ec4&#xff09;\u3002<\/li>\n<li>\u904d\u5386\u65b9\u5f0f\u6709&#xff1a;\n<li>\u6df1\u5ea6\u4f18\u5148&#xff1a;\u524d\u4e2d\u540e\u5e8f\u904d\u5386&#xff08;\u9012\u5f52&#xff0c;\u8fed\u4ee3&#xff09;<\/li>\n<li>\u5e7f\u5ea6\u4f18\u5148&#xff1a;\u5c42\u5e8f\u904d\u5386&#xff08;\u8fed\u4ee3&#xff09;<\/li>\n<\/li>\n<li>\u4e8c\u53c9\u6811\u7ed3\u70b9\u7684\u5b9a\u4e49<\/li>\n<\/ul>\n<p> <span class=\"token operator\">*<\/span> Definition <span class=\"token keyword\">for<\/span> a binary tree node<span class=\"token punctuation\">.<\/span><br \/>\n <span class=\"token operator\">*<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">TreeNode<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n <span class=\"token operator\">*<\/span>     <span class=\"token keyword\">int<\/span> val<span class=\"token punctuation\">;<\/span><br \/>\n <span class=\"token operator\">*<\/span>     TreeNode <span class=\"token operator\">*<\/span>left<span class=\"token punctuation\">;<\/span><br \/>\n <span class=\"token operator\">*<\/span>     TreeNode <span class=\"token operator\">*<\/span>right<span class=\"token punctuation\">;<\/span><br \/>\n <span class=\"token operator\">*<\/span>     <span class=\"token function\">TreeNode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">val<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">left<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">right<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n <span class=\"token operator\">*<\/span>     <span class=\"token function\">TreeNode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">val<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">left<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">right<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n <span class=\"token operator\">*<\/span>     <span class=\"token function\">TreeNode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> TreeNode <span class=\"token operator\">*<\/span>left<span class=\"token punctuation\">,<\/span> TreeNode <span class=\"token operator\">*<\/span>right<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">val<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">left<\/span><span class=\"token punctuation\">(<\/span>left<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">right<\/span><span class=\"token punctuation\">(<\/span>right<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>\u4e8c\u53c9\u6811\u7684\u9012\u5f52\u904d\u5386<\/h2>\n<h3>\u5361\u54e5\u6587\u5b57\u4ee5\u53ca\u89c6\u9891\u8bb2\u89e3\u94fe\u63a5<\/h3>\n<h4>\u91cd\u70b9<\/h4>\n<ul>\n<li>\u4e8c\u53c9\u6811\u7684\u5b66\u4e60\u5f15\u5165\u4e86\u9012\u5f52\u7684\u5927\u91cf\u4f7f\u7528<\/li>\n<li>\u9012\u5f52\u4e09\u8981\u7d20&#xff1a;\n<li>\u786e\u5b9a\u9012\u5f52\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c<\/li>\n<li>\u786e\u5b9a\u7ec8\u6b62\u6761\u4ef6<\/li>\n<li>\u786e\u5b9a\u5355\u5c42\u9012\u5f52\u7684\u903b\u8f91<\/li>\n<\/li>\n<li>\u9012\u5f52\u5f00\u9500\u5927&#xff0c;\u5185\u5b58\u5360\u7528\u4e45<\/li>\n<\/ul>\n<h4>c&#043;&#043;\u5b9e\u73b0&#xff08;\u524d\u5e8f\u904d\u5386&#xff09;\u4e2d&#xff0c;\u5de6&#xff0c;\u53f3<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">preorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ if(root &#061;&#061; nullptr) return {};\u4e09\u5904\u6ce8\u91ca\u642d\u914d\u4f7f\u7528&#xff0c;\u8d77\u5230\u9012\u5f52\u51fd\u6570\u4e2d\u7684\u7ec8\u6b62\u6761\u4ef6\u4f5c\u7528<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<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> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/\/\u8fd9\u4e2a\u5f15\u7528\u5f88\u91cd\u8981<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u7ec8\u6b62\u6761\u4ef6<\/span><br \/>\n        result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">-&gt;<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u4e2d<\/span><br \/>\n        <span class=\"token comment\">\/*if(root -&gt; left)*\/<\/span> <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5de6\u5b69\u5b50<\/span><br \/>\n        <span class=\"token comment\">\/*if(root -&gt; right)*\/<\/span> <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u53f3\u5b69\u5b50<\/span><br \/>\n        <span class=\"token keyword\">return<\/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<h4>c&#043;&#043;\u5b9e\u73b0&#xff08;\u4e2d\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u4e2d&#xff0c;\u53f3<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">preorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">traverse<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">traverse<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> node<span class=\"token punctuation\">,<\/span> std<span class=\"token double-colon 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> res<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>node <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u9012\u5f52\u7ec8\u6b62\u6761\u4ef6<\/span><br \/>\n        <span class=\"token function\">traverse<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token operator\">-&gt;<\/span>left<span class=\"token punctuation\">,<\/span>  res<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5de6<\/span><br \/>\n        res<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token operator\">-&gt;<\/span>val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u4e2d<\/span><br \/>\n        <span class=\"token function\">traverse<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token operator\">-&gt;<\/span>right<span class=\"token punctuation\">,<\/span> res<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u53f3<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>c&#043;&#043;\u5b9e\u73b0&#xff08;\u540e\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u53f3&#xff0c;\u4e2d<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">postorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<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> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">travalTree<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">-&gt;<\/span> val<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<h2>\u4e8c\u53c9\u6811\u7684\u8fed\u4ee3\u904d\u5386<\/h2>\n<h3>\u5361\u54e5\u6587\u5b57\u4ee5\u53ca\u89c6\u9891\u8bb2\u89e3\u94fe\u63a5<\/h3>\n<h4>\u91cd\u70b9<\/h4>\n<ul>\n<li>\u624b\u52a8\u5b9e\u73b0\u4e00\u904d&#xff0c;\u6309\u7167\u5b9e\u73b0\u6b65\u9aa4\u8f6c\u6362\u6210\u4ee3\u7801&#xff0c;\u5c31\u7406\u89e3\u4e86<\/li>\n<li>\u5c31\u662f\u4e00\u4e2a\u6808&#xff0c;\u653e\u8fdb\u653e\u51fa\u3002<\/li>\n<li>\u53ea\u7528\u6808&#xff0c;\u6240\u6709\u7684\u5faa\u73af\u5224\u65ad\u4f9d\u9760\u7684\u662f\u6808\u672c\u8eab\u3002\u5f39\u51fa\u987a\u5e8f\u548c\u4f7f\u7528\u987a\u5e8f\u4e00\u81f4\u3002<\/li>\n<li>\u4e2d\u5e8f\u904d\u5386\u4f7f\u7528\u4e00\u4e2a\u6808\u65e0\u6cd5\u5b9e\u73b0&#xff0c;\u5c31\u662f\u56e0\u4e3a\u6808\u9876\u8282\u70b9\u548c\u8981\u4f7f\u7528\u8282\u70b9\u4e0d\u4e00\u81f4\u3002\u5faa\u73af\u5224\u65ad\u6761\u4ef6\u4f9d\u9760\u7684\u662f\u5e2e\u52a9\u6307\u5b9a\u7684\u6307\u9488\u548c\u6808\u672c\u8eab\u3002<\/li>\n<\/ul>\n<h4>c&#043;&#043;\u5b9e\u73b0&#xff08;\u524d\u5e8f\u904d\u5386&#xff09;\u4e2d&#xff0c;\u5de6&#xff0c;\u53f3<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">preorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        stack<span class=\"token operator\">&lt;<\/span>TreeNode<span class=\"token operator\">*<\/span><span class=\"token operator\">&gt;<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u68c0\u67e5\u975e\u7a7a&#xff0c;\u9632\u6b62\u8d8a\u754c<\/span><br \/>\n        st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u548cwhile\u6761\u4ef6\u642d\u914d<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            TreeNode<span class=\"token operator\">*<\/span> temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6808\u7684\u7279\u70b9&#xff0c;\u5148\u8fdb\u540e\u51fa&#xff0c;\u6240\u4ee5\u8981\u5148\u4f7f\u7528\u5c31\u8981\u540e\u653e\u3002\u5148\u653e\u53f3&#xff0c;\u518d\u653e\u5de6<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<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<h4>c&#043;&#043;\u5b9e\u73b0&#xff08;\u4e2d\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u4e2d&#xff0c;\u53f3<\/h4>\n<p>\u4e00\u76f4\u5411\u5de6\u8d70\u5230\u5e95&#xff08;\u5165\u6808&#xff09;&#xff0c;\u9047\u5230\u7a7a\u5c31\u5f39\u51fa\u6808\u9876&#xff08;\u5373\u201c\u56de\u6eaf\u201d&#xff09;&#xff0c;\u8bbf\u95ee\u8be5\u8282\u70b9&#xff0c;\u7136\u540e\u8f6c\u5411\u5176\u53f3\u5b50\u6811\u3002<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">inorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        stack<span class=\"token operator\">&lt;<\/span>TreeNode<span class=\"token operator\">*<\/span><span class=\"token operator\">&gt;<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        TreeNode<span class=\"token operator\">*<\/span> cur <span class=\"token operator\">&#061;<\/span> root<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u8fd9\u4e2a\u5faa\u73af\u662f\u4e3a\u4e86\u4f7f\u7528cur<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>cur <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span> <span class=\"token operator\">||<\/span> <span class=\"token operator\">!<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cur <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>cur<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                cur <span class=\"token operator\">&#061;<\/span> cur <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5de6<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                cur <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>cur <span class=\"token operator\">-&gt;<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u4e2d<\/span><br \/>\n                cur <span class=\"token operator\">&#061;<\/span> cur <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u53f3<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<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<ul>\n<li>\u56e0\u4e3a\u6808\u653e\u8fdb\u53bb\u4e4b\u540e&#xff0c;\u6240\u6709\u5143\u7d20\u90fd\u6ca1\u6709\u533a\u522b&#xff0c;\u53ea\u6709\u6808\u9876\u83b7\u53d6&#xff0c;\u5f39\u51fa&#xff0c;\u6240\u4ee5\u9700\u8981\u53e6\u4e00\u4e2a\u6307\u9488\u6765\u786e\u5b9a\u6808\u9876\u7684\u5143\u7d20\u662f\u5426\u8981\u4f7f\u7528<\/li>\n<\/ul>\n<h4>c&#043;&#043;\u5b9e\u73b0&#xff08;\u540e\u5e8f\u904d\u5386&#xff09;\u5de6&#xff0c;\u53f3&#xff0c;\u4e2d<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">postorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        stack<span class=\"token operator\">&lt;<\/span>TreeNode<span class=\"token operator\">*<\/span><span class=\"token operator\">&gt;<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            TreeNode<span class=\"token operator\">*<\/span> temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u56e0\u4e3a\u8981\u4fdd\u8bc1\u4f7f\u7528\u987a\u5e8f\u662f\u5148\u4e2d&#xff0c;\u6240\u4ee5\u628a\u5de6\u53f3\u4e2d\u770b\u4f5c\u4e2d\u53f3\u5de6\u7684\u9006\u5e8f\u3002<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/\u6574\u4f53\u53cd\u8f6c<\/span><br \/>\n        <span class=\"token function\">reverse<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<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<h2>\u4e8c\u53c9\u6811\u7684\u7edf\u4e00\u8fed\u4ee3\u6cd5<\/h2>\n<h3>\u5361\u54e5\u6587\u5b57\u4ee5\u53ca\u89c6\u9891\u8bb2\u89e3\u94fe\u63a5<\/h3>\n<h4>\u91cd\u70b9<\/h4>\n<ul>\n<li>\u4e24\u79cd\u65b9\u6cd5<\/li>\n<li>\u7b2c\u4e00\u79cd&#xff0c;\u4e00\u4e2a\u8282\u70b9\u53ef\u4ee5\u5904\u7406\u7684\u8303\u56f4\u662f\u81ea\u5df1\u548c\u5de6\u53f3\u5b69\u5b50&#xff08;\u8be5\u8282\u70b9\u7684\u6839&#xff0c;\u8be5\u8282\u70b9\u5904\u7406\u4e0d\u5230&#xff09;\u3002\u8282\u70b9\u5206\u4e24\u90e8\u5206\u5b8c\u6210\u904d\u5386&#xff0c;\u7b2c\u4e00\u6b21\u901a\u8fc7\u8282\u70b9\u6765\u83b7\u5f97\u5de6\u53f3\u5b69\u5b50&#xff0c;\u7b2c\u4e8c\u6b21\u770b\u5230\u7b2c\u4e00\u6b21\u5904\u7406\u8fc7\u7684\u6807\u5fd7\u76f4\u63a5\u5904\u7406\u672c\u8282\u70b9\u3002<\/li>\n<li>\u7b2c\u4e8c\u79cd&#xff0c;\u7ed9\u4e00\u4e2apair&#xff0c;first\u8868\u793a\u8282\u70b9&#xff0c;second\u8868\u793a\u662f\u5426\u4f7f\u7528\u8fc7\u3002<\/li>\n<li>\u672c\u8d28\u662f\u4e00\u79cd\u65b9\u5f0f&#xff0c;\u5c31\u662f\u8ba9\u8282\u70b9\u5206\u4e24\u6b65\u8fdb\u884c\u3002\u6ca1\u5904\u7406\u8fc7\u7684\u5148\u5904\u7406&#xff0c;\u5904\u7406\u8fc7\u7684\u76f4\u63a5\u7528\u3002<\/li>\n<\/ul>\n<h4>c&#043;&#043;\u5b9e\u73b0 &#xff08;\u524d\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528null\u8868\u793a\u4f7f\u7528<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">preorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        stack<span class=\"token operator\">&lt;<\/span>TreeNode<span class=\"token operator\">*<\/span><span class=\"token operator\">&gt;<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u68c0\u67e5\u975e\u7a7a<\/span><br \/>\n        st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8fd8\u662f\u548cwhile\u642d\u914d<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            TreeNode<span class=\"token operator\">*<\/span> temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6bcf\u6b21\u8fdb\u5165\u9996\u5148\u83b7\u53d6\u6808\u9876\u5143\u7d20<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/\u56e0\u4e3a\u662f\u524d\u5e8f&#xff0c;\u9700\u8981\u5f39\u51fa\u91cd\u65b0\u6392\u4e00\u4e0b\u5e8f<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/\u5728\u8981\u4f7f\u7528\u5143\u7d20\u540e\u52a0\u4e00\u4e2a NULL \u8868\u793a\u8fd9\u4e2a\u8282\u70b9\u548c\u5468\u56f4\u7684\u7236\u5b50\u5173\u7cfb\u5df2\u7ecf\u5b9e\u73b0\u8fc7\u4e86&#xff0c;\u4e0b\u4e00\u6b21\u5c31\u662f\u4f7f\u7528<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/\u6808\u9876\u4e3a\u7a7a&#xff0c;\u5f39\u51fa&#xff0c;\u83b7\u5f97\u65b0\u6808\u9876&#xff0c;\u4f7f\u7528<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<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<h4>c&#043;&#043;\u5b9e\u73b0 (\u4e2d\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528null\u8868\u793a\u4f7f\u7528<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">inorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        stack<span class=\"token operator\">&lt;<\/span>TreeNode<span class=\"token operator\">*<\/span><span class=\"token operator\">&gt;<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            TreeNode<span class=\"token operator\">*<\/span> temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<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<h4>c&#043;&#043;\u5b9e\u73b0 (\u540e\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528null\u8868\u793a\u4f7f\u7528<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">postorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        stack<span class=\"token operator\">&lt;<\/span>TreeNode<span class=\"token operator\">*<\/span><span class=\"token operator\">&gt;<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            TreeNode<span class=\"token operator\">*<\/span> temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/\u8fd9\u91cc\u4e0d\u7528\u5f39\u51fa<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> right<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> left<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                temp <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">-&gt;<\/span> val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<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<h4>c&#043;&#043;\u5b9e\u73b0 (\u4e2d\u5e8f\u904d\u5386&#xff09;\u4f7f\u7528 pair \u643a\u5e26\u4e00\u4e2abool\u6765\u786e\u5b9a\u5143\u7d20\u72b6\u6001<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">inorderTraversal<\/span><span class=\"token punctuation\">(<\/span>TreeNode<span class=\"token operator\">*<\/span> root<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        stack<span class=\"token operator\">&lt;<\/span>pair<span class=\"token operator\">&lt;<\/span>TreeNode<span class=\"token operator\">*<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">bool<\/span><span class=\"token operator\">&gt;&gt;<\/span> st<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>root <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            st<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">make_pair<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u591a\u52a0\u4e00\u4e2a\u53c2\u6570&#xff0c;false \u4e3a\u9ed8\u8ba4\u503c&#xff0c;\u542b\u4e49\u89c1\u4e0b\u6587\u6ce8\u91ca<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>st<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">auto<\/span> node <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>first<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">auto<\/span> visited <span class=\"token operator\">&#061;<\/span> st<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>second<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u591a\u52a0\u4e00\u4e2a visited \u53c2\u6570&#xff0c;\u4f7f\u201c\u8fed\u4ee3\u7edf\u4e00\u5199\u6cd5\u201d\u6210\u4e3a\u4e00\u4ef6\u7b80\u5355\u7684\u4e8b<\/span><br \/>\n            st<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>visited<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ visited \u4e3a True&#xff0c;\u8868\u793a\u8be5\u8282\u70b9\u548c\u4e24\u4e2a\u513f\u5b50\u4f4d\u6b21\u4e4b\u524d\u5df2\u7ecf\u5b89\u6392\u8fc7\u4e86&#xff0c;\u73b0\u5728\u53ef\u4ee5\u6536\u5272\u8282\u70b9\u4e86<\/span><br \/>\n                result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>node<span class=\"token operator\">-&gt;<\/span>val<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ visited \u5f53\u524d\u4e3a false, 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