{"id":1090,"date":"2020-05-31T10:44:10","date_gmt":"2020-05-31T02:44:10","guid":{"rendered":"https:\/\/summid.icu\/?p=1090"},"modified":"2023-06-01T15:18:16","modified_gmt":"2023-06-01T07:18:16","slug":"leetcode_2","status":"publish","type":"post","link":"https:\/\/summid.icu\/index.php\/2020\/05\/31\/leetcode_2\/","title":{"rendered":"leetCode_\u5251\u6307offer\u9762\u8bd5\u9898(\u4e2d\uff09"},"content":{"rendered":"

\u9762\u8bd5\u989831. \u6808\u7684\u538b\u5165\u3001\u5f39\u51fa\u5e8f\u5217<\/span><\/h1>\n

\u8f93\u5165\u4e24\u4e2a\u6574\u6570\u5e8f\u5217\uff0c\u7b2c\u4e00\u4e2a\u5e8f\u5217\u8868\u793a\u6808\u7684\u538b\u5165\u987a\u5e8f\uff0c\u8bf7\u5224\u65ad\u7b2c\u4e8c\u4e2a\u5e8f\u5217\u662f\u5426\u4e3a\u8be5\u6808\u7684\u5f39\u51fa\u987a\u5e8f\u3002\u5047\u8bbe\u538b\u5165\u6808\u7684\u6240\u6709\u6570\u5b57\u5747\u4e0d\u76f8\u7b49\u3002\u4f8b\u5982\uff0c\u5e8f\u5217 {1,2,3,4,5} \u662f\u67d0\u6808\u7684\u538b\u6808\u5e8f\u5217\uff0c\u5e8f\u5217 {4,5,3,2,1} \u662f\u8be5\u538b\u6808\u5e8f\u5217\u5bf9\u5e94\u7684\u4e00\u4e2a\u5f39\u51fa\u5e8f\u5217\uff0c\u4f46 {4,3,5,1,2} \u5c31\u4e0d\u53ef\u80fd\u662f\u8be5\u538b\u6808\u5e8f\u5217\u7684\u5f39\u51fa\u5e8f\u5217\u3002<\/span><\/p>\n\n\n

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

\u601d\u8def\uff1a\u501f\u7528\u4e00\u4e2a\u8f85\u52a9\u6808stack\uff0c\u6a21\u62df\u538b\u5165\/\u5f39\u51fa\u64cd\u4f5c\u7684\u6392\u5217\u3002\u6839\u636e\u662f\u5426\u6a21\u62df\u6210\u529f\uff0c\u5373\u53ef\u5f97\u5230\u7ed3\u679c\u3002<\/span>
\u5165\u6808\u64cd\u4f5c\uff1a\u6309\u7167\u538b\u6808\u5e8f\u5217\u7684\u987a\u5e8f\u6267\u884c\u3002<\/span>
\u51fa\u6808\u64cd\u4f5c\uff1a\u6bcf\u6b21\u5165\u6808\u540e\uff0c\u5faa\u73af\u5224\u65ad\u201c\u6808\u9876\u5143\u7d20=\u5f39\u51fa\u5e8f\u5217\u7684\u5f53\u524d\u5143\u7d20\u201d\u662f\u5426\u6210\u7acb\uff0c\u5c06\u7b26\u5408\u5f39\u51fa\u5e8f\u5217\u987a\u5e8f\u7684\u6808\u9876\u5143\u7d20\u5168\u90e8\u5f39\u51fa\u3002<\/span>
\u6700\u540e\u5224\u65ad\u51fa\u6808\u5217\u8868\u6307\u9488\u662f\u5426\u6307\u5411\u51fa\u6808\u5217\u8868\u7684\u672b\u5c3e\u5373\u53ef\u3002<\/span><\/p>\n\n\n

class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0bool\u00a0validateStackSequences(vector<int>&\u00a0pushed,\u00a0vector<int>&\u00a0popped)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(popped.empty())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0true;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0stack<int>\u00a0a;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0indexPop=0;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for(int\u00a0i=0;i<pushed.size();++i)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0a.push(pushed[i]);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!a.empty()&&a.top()==popped[indexPop])\/\/\u7b2c\u4e00\u4e2a\u5224\u65ad\u975e\u7a7a\u653e\u5728\u524d\u9762\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0a.pop();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0indexPop++;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(indexPop==popped.size())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0true;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0false;\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
\n\n\n
\u9762\u8bd5\u989832 – I. \u4ece\u4e0a\u5230\u4e0b\u6253\u5370\u4e8c\u53c9\u6811<\/span><\/h1>\n
\u4ece\u4e0a\u5230\u4e0b\u6253\u5370\u51fa\u4e8c\u53c9\u6811\u7684\u6bcf\u4e2a\u8282\u70b9\uff0c\u540c\u4e00\u5c42\u7684\u8282\u70b9\u6309\u7167\u4ece\u5de6\u5230\u53f3\u7684\u987a\u5e8f\u6253\u5370\u3002<\/span><\/p>\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0vector<int>\u00a0levelOrder(TreeNode*\u00a0root)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0vector<int>\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0queue<TreeNode*>\u00a0q;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(root);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!q.empty())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u961f\u9996\u5143\u7d20\u51fa\u961f\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TreeNode*\u00a0node=q.front();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.pop();\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u51fa\u961f\u5143\u7d20\u52a0\u5165res\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0res.push_back(node->val);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u51fa\u961f\u5143\u7d20\u5b50\u7ed3\u70b9\u5165\u961f\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(node->left!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(node->left);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(node->right!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(node->right);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
\n\n\n
\u9762\u8bd5\u989832 – II. \u4ece\u4e0a\u5230\u4e0b\u6253\u5370\u4e8c\u53c9\u6811 II<\/span><\/h1>\n
\u4ece\u4e0a\u5230\u4e0b\u6309\u5c42\u6253\u5370\u4e8c\u53c9\u6811\uff0c\u540c\u4e00\u5c42\u7684\u8282\u70b9\u6309\u4ece\u5de6\u5230\u53f3\u7684\u987a\u5e8f\u6253\u5370\uff0c\u6bcf\u4e00\u5c42\u6253\u5370\u5230\u4e00\u884c\u3002<\/span><\/p>\n\n\n
\"\"<\/div><\/figure>\n\n\n
\u601d\u8def\uff1a\u8fd9\u4e2a\u9898\u4e0e\u666e\u901a\u7684\u4e8c\u53c9\u6811\u5c42\u5e8f\u904d\u5386\u7684\u4e0d\u540c\u70b9\u5728\u4e8e\uff0c\u8981\u533a\u5206\u4e0d\u540c\u5c42\u7684\u8282\u70b9\u5e76\u628a\u540c\u4e00\u5c42\u7684\u8282\u70b9\u6253\u5370\u5230\u4e00\u8d77\u3002<\/span>
\u56e0\u6b64\u6211\u4eec\u5728\u539f\u672c\u7684\u5faa\u73af\u5185\u518d\u6dfb\u52a0\u4e00\u4e2a\u5faa\u73af\uff0c\u5faa\u73af\u6b21\u6570\u4e3a\u5f53\u524d\u961f\u5217\u7684\u957f\u5ea6\u2014\u2014\u8df3\u51fa\u5faa\u73af\u65f6\u5c31\u6253\u5370\u5b8c\u4e00\u5c42\u8282\u70b9\uff0c\u5e76\u4e14\u5b83\u4eec\u7684\u5b50\u7ed3\u70b9\u5168\u90e8\u5165\u961f\u3002<\/span>
\u4e3a\u4e86\u4e34\u65f6\u5b58\u50a8\u4e00\u5c42\u8282\u70b9\u7684\u503c\uff0c\u6211\u4eec\u7533\u8bf7\u4e86\u4e00\u4e2a\u4e34\u65f6\u5217\u8868tem\u6765\u8f85\u52a9\u3002<\/span><\/p>\n\n\n
class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0vector<vector<int>>\u00a0levelOrder(TreeNode*\u00a0root)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0vector<vector<int>>\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0queue<TreeNode*>\u00a0q;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(root);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!q.empty())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0vector<int>\u00a0tem;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0size=q.size();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for(int\u00a0i=0;i<size;++i)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TreeNode*\u00a0temp=q.front();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.pop();\/\/\u6267\u884c\u5b8c\u8fd9\u4e00\u53e5\u4f1a\u6539\u53d8q.size()\u7684\u8fd4\u56de\u503c\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tem.push_back(temp->val);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(temp->left!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(temp->left);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(temp->right!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(temp->right);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0res.push_back(tem);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
\n\n\n
\u9762\u8bd5\u989832 – III. \u4ece\u4e0a\u5230\u4e0b\u6253\u5370\u4e8c\u53c9\u6811 III<\/span><\/h1>\n
\u8bf7\u5b9e\u73b0\u4e00\u4e2a\u51fd\u6570\u6309\u7167\u4e4b\u5b57\u5f62\u987a\u5e8f\u6253\u5370\u4e8c\u53c9\u6811\uff0c\u5373\u7b2c\u4e00\u884c\u6309\u7167\u4ece\u5de6\u5230\u53f3\u7684\u987a\u5e8f\u6253\u5370\uff0c\u7b2c\u4e8c\u5c42\u6309\u7167\u4ece\u53f3\u5230\u5de6\u7684\u987a\u5e8f\u6253\u5370\uff0c\u7b2c\u4e09\u884c\u518d\u6309\u7167\u4ece\u5de6\u5230\u53f3\u7684\u987a\u5e8f\u6253\u5370\uff0c\u5176\u4ed6\u884c\u4ee5\u6b64\u7c7b\u63a8\u3002<\/span><\/p>\n\n\n
\"\"<\/div><\/figure>\n\n\n
\u601d\u8def\uff1a<\/span><\/p>\n
    \n
  • \u6807\u8bc6\u503c\uff1a\u56e0\u4e3a\u5411\u5de6\u5411\u53f3\u6253\u5370\u7684\u987a\u5e8f\u662f\u6bcf\u5c42\u66ff\u6362\u7684\uff0c\u6240\u4ee5\u9700\u8981\u4e00\u4e2abool\u6807\u8bc6\u503cright\uff0c\u901a\u8fc7\u5b83\u6765\u5224\u65ad\u63a5\u4e0b\u6765\u7684\u6253\u5370\u987a\u5e8f\u3002right\u4e3atrue\u8868\u793a\u5f53\u524d\u4e3a\u5411\u53f3\u6253\u5370\uff0c\u4e3afalse\u8868\u793a\u5f53\u524d\u4e3a\u5411\u5de6\u6253\u5370\u3002<\/span><\/li>\n
  • \u8f85\u52a9\u961f\u5217\uff1a\u548c\u666e\u901a\u7684\u5c42\u5e8f\u904d\u5386\u4e00\u6837\uff0c\u9700\u8981\u4e00\u4e2a\u961f\u5217\u6765\u5b8c\u6210BFS\u641c\u7d22\u3002<\/span><\/li>\n
  • \u8f85\u52a9vector\uff1a\u548c\u4e0a\u9898\u7684\u6bcf\u5c42\u8282\u70b9\u6253\u5370\u5230\u4e00\u7ec4\u4e00\u6837\uff0c\u9700\u8981\u4e00\u4e2a\u8f85\u52a9vector\u6765\u6682\u5b58\u540c\u4e00\u5c42\u7684\u8282\u70b9\u503c\uff0c\u7136\u540e\u628a\u5b83\u52a0\u5165\u5230\u7ed3\u679cvector\u91ccres\u3002<\/span><\/li>\n
  • \u8f85\u52a9\u6808\uff1a\u8fd9\u662f\u8fd9\u9898\u65b0\u6dfb\u52a0\u7684\u8f85\u52a9\u6808\uff0c\u4ed4\u7ec6\u60f3\u4e00\u4e0b\uff0c\u7531\u4e8e\u5f53\u524d\u5c42\u548c\u4e0b\u4e00\u5c42\u6253\u5370\u987a\u5e8f\u662f\u5012\u5e8f\u7684\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u501f\u52a9\u6808\u7684\u5148\u5165\u540e\u51fa\u7684\u7279\u70b9\uff1a\u5728\u6253\u5370\u961f\u5217\u8282\u70b9\u65f6\uff0c\u540c\u65f6\u5c06\u8282\u70b9\u5165\u6808\u4fdd\u5b58\uff1b\u5f53\u961f\u5217\u8282\u70b9\u6253\u5370\u5b8c\u540e\uff08\u540c\u65f6\u961f\u5217\u91cc\u5df2\u7ecf\u6ca1\u6709\u8282\u70b9\uff09\uff0c\u5c06\u6808\u91cc\u7684\u8282\u70b9\u4f9d\u6b21\u51fa\u6808\uff0c\u6839\u636e\u6807\u8bc6\u503cright\u7684\u5e03\u5c14\u503c\u5c06\u8fd9\u4e9b\u8282\u70b9\u7684\u5b50\u7ed3\u70b9\u52a0\u5165\u961f\u5217\u3002<\/span><\/li>\n
  • \u5b50\u7ed3\u70b9\u5165\u961f\u7684\u987a\u5e8f\uff1a\u5982\u679c\u4e0b\u4e00\u5c42\u662f\u5411\u5de6\u6253\u5370\uff08right==true\uff09\uff0c\u5219\u5148\u52a0\u5165\u53f3\u8282\u70b9\uff0c\u518d\u52a0\u5165\u5de6\u8282\u70b9\uff1b\u5982\u679c\u4e0b\u4e00\u5c42\u662f\u5411\u53f3\u6253\u5370\uff08right==false\uff09\uff0c\u5219\u5148\u52a0\u5165\u5de6\u8282\u70b9\uff0c\u518d\u52a0\u5165\u53f3\u8282\u70b9\u3002<\/span><\/li>\n<\/ul>\n\n\n
    class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0vector<vector<int>>\u00a0levelOrder(TreeNode*\u00a0root)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0vector<vector<int>>\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0bool\u00a0right=true;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0stack<TreeNode*>\u00a0s;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0queue<TreeNode*>\u00a0q;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(root);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!q.empty())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0vector<int>\u00a0tem;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u6253\u5370\u961f\u5217\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!q.empty())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u6253\u5370\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TreeNode*\u00a0node=q.front();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tem.push_back(node->val);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u51fa\u961f\u5e76\u5165\u6808\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.pop();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0s.push(node);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5c06\u6808\u91cc\u7684\u8282\u70b9\u7684\u5b50\u7ed3\u70b9\u5165\u961f\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(!s.empty())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(right)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5982\u679c\u5f53\u524d\u662f\u5411\u53f3\u6253\u5370\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u90a3\u4e0b\u4e00\u5c42\u662f\u5411\u5de6\u6253\u5370\uff0c\u53f3\u8282\u70b9\u5148\u5165\u961f\uff0c\u5de6\u8282\u70b9\u540e\u5165\u961f\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TreeNode*\u00a0temp=s.top();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(temp->right!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(temp->right);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(temp->left!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(temp->left);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0s.pop();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(!right)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5982\u679c\u5f53\u524d\u662f\u5411\u5de6\u6253\u5370\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u90a3\u4e0b\u4e00\u5c42\u662f\u5411\u53f3\u6253\u5370\uff0c\u5de6\u8282\u70b9\u5148\u5165\u961f\uff0c\u53f3\u8282\u70b9\u540e\u5165\u961f\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0TreeNode*\u00a0temp=s.top();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(temp->left!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(temp->left);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(temp->right!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0q.push(temp->right);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0s.pop();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0right=!right;\/\/\u8bb0\u5f97\u8f6c\u5411\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0res.push_back(tem);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
    \n\n\n
    \u9762\u8bd5\u989833. \u4e8c\u53c9\u641c\u7d22\u6811\u7684\u540e\u5e8f\u904d\u5386\u5e8f\u5217<\/span><\/h1>\n
    \u8f93\u5165\u4e00\u4e2a\u6574\u6570\u6570\u7ec4\uff0c\u5224\u65ad\u8be5\u6570\u7ec4\u662f\u4e0d\u662f\u67d0\u4e8c\u53c9\u641c\u7d22\u6811\u7684\u540e\u5e8f\u904d\u5386\u7ed3\u679c\u3002\u5982\u679c\u662f\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002\u5047\u8bbe\u8f93\u5165\u7684\u6570\u7ec4\u7684\u4efb\u610f\u4e24\u4e2a\u6570\u5b57\u90fd\u4e92\u4e0d\u76f8\u540c\u3002<\/span><\/p>\n
    \u53c2\u8003\u4ee5\u4e0b\u8fd9\u9897\u4e8c\u53c9\u641c\u7d22\u6811\uff1a<\/span><\/p>\n\n\n
    \"\"<\/div><\/figure>\n\n\n
    \u89e3\u9898\u601d\u8def\uff1a<\/span><\/strong><\/p>\n
      \n
    • \u540e\u5e8f\u904d\u5386\u5b9a\u4e49<\/strong>\uff1a [ \u5de6\u5b50\u6811 | \u53f3\u5b50\u6811 | \u6839\u8282\u70b9 ]<\/span>\uff0c\u5373\u904d\u5386\u987a\u5e8f\u4e3a\u201c\u5de6\u3001\u53f3\u3001\u6839\u201d\u3002<\/span><\/li>\n
    • \u4e8c\u53c9\u641c\u7d22\u6811\u5b9a\u4e49<\/strong>\uff1a\u5de6\u5b50\u6811\u4e2d\u6240\u6709\u8282\u70b9\u7684\u503c\uff1c\u6839\u8282\u70b9\u7684\u503c\uff1b\u53f3\u5b50\u6811\u4e2d\u6240\u6709\u8282\u70b9\u7684\u503c\uff1e\u6839\u8282\u70b9\u7684\u503c\uff1b\u5176\u5de6\u3001\u53f3\u5b50\u6811\u4e5f\u5206\u522b\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811\u3002<\/span><\/li>\n<\/ul>\n\n\n
      \"\"<\/div><\/figure>\n\n\n
      \u65b9\u6cd5\uff1a\u9012\u5f52\u5206\u6cbb<\/strong><\/span><\/p>\n
        \n
      • \u6839\u636e\u4e8c\u53c9\u641c\u7d22\u6811\u7684\u5b9a\u4e49\uff0c\u53ef\u4ee5\u901a\u8fc7\u9012\u5f52\uff0c\u5224\u65ad\u6240\u6709\u5b50\u6811\u7684 \u6b63\u786e\u6027 \uff08\u5373\u5176\u540e\u5e8f\u904d\u5386\u662f\u5426\u6ee1\u8db3\u4e8c\u53c9\u641c\u7d22\u6811\u7684\u5b9a\u4e49\uff09\uff0c\u82e5\u6240\u6709\u5b50\u6811\u90fd\u6b63\u786e\uff0c\u5219\u6b64\u5e8f\u5217\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811\u7684\u540e\u5e8f\u904d\u5386\u3002<\/span><\/li>\n<\/ul>\n
        \u9012\u5f52\u89e3\u6790\uff1a<\/span><\/p>\n
          \n
        • \u7ec8\u6b62\u6761\u4ef6<\/strong>\uff1a \u5f53 i \u2265 j \uff0c\u8bf4\u660e\u6b64\u5b50\u6811\u8282\u70b9\u6570\u91cf \u2264 1\uff0c\u65e0\u987b\u5224\u522b\u6b63\u786e\u6027\uff0c\u56e0\u6b64\u76f4\u63a5\u8fd4\u56detrue\uff1b<\/span><\/li>\n
        • \u9012\u63a8\u5de5\u4f5c<\/strong>\uff1a<\/span>\n
            \n
          • \u5212\u5206\u5de6\u53f3\u5b50\u6570<\/strong>\uff1a\u904d\u5386\u540e\u5e8f\u904d\u5386\u7684 [i\uff0cj] \u533a\u95f4\u5143\u7d20\uff0c\u5bfb\u627e \u7b2c\u4e00\u4e2a\u5927\u4e8e\u6839\u8282\u70b9 \u7684\u8282\u70b9\uff0c\u7d22\u5f15\u8bb0\u4e3a m <\/span>\u3002\u6b64\u65f6\uff0c\u53ef\u5212\u5206\u5904\u5de6\u5b50\u6811\u533a\u95f4 [i\uff0cm-1]<\/span> \u3001\u53f3\u5b50\u6811\u533a\u95f4 [m\uff0cj-1]<\/span> \u3001\u6839\u8282\u70b9\u7d22\u5f15 j <\/span>\u3002<\/span><\/li>\n
          • \u5224\u65ad\u662f\u5426\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811<\/strong>\uff1a<\/span>\n
              \n
            • \u5de6\u5b50\u6811\u533a\u95f4 [i\uff0cm-1]<\/span> \u5185\u7684\u6240\u6709\u8282\u70b9\u90fd\u5e94 \uff1c postorder[j]<\/span> \u3002\u800c\u4e0a\u9762 \u5212\u5206\u5de6\u53f3\u5b50\u6570<\/span> \u6b65\u9aa4\u5df2\u7ecf\u4fdd\u8bc1\u5de6\u5b50\u6811\u533a\u95f4\u7684\u6b63\u786e\u6027\uff0c\u56e0\u6b64\u53ea\u9700\u8981\u5224\u65ad\u53f3\u5b50\u6811\u533a\u95f4\u5373\u53ef\u3002<\/span><\/li>\n
            • \u53f3\u5b50\u6811\u533a\u95f4 [m\uff0cj-1]<\/span> \u5185\u7684\u6240\u6709\u8282\u70b9\u90fd\u5e94 \uff1e postorder[j]<\/span> \u3002\u5b9e\u73b0\u65b9\u5f0f\u4e3a\u904d\u5386\uff0c\u5f53\u9047\u5230 \u2264 postorder[j]<\/span> \u7684\u8282\u70b9\u5219\u8df3\u51fa\uff1b\u5219\u53ef\u901a\u8fc7   p == j<\/span> \u5224\u65ad\u662f\u5426\u4e3a\u4e8c\u53c9\u641c\u7d22\u6811\u3002<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
            • \u8fd4\u56de\u503c\uff1a\u6240\u6709\u5b50\u6811\u90fd\u9700\u6b63\u786e\u624d\u53ef\u5224\u5b9a\u6b63\u786e\uff0c\u56e0\u6b64\u4f7f\u7528 \u4e0e\u903b\u8f91\u7b26 &&<\/strong> \u8fde\u63a5\u3002<\/span>\n
                \n
              • p == j \uff1a\u5224\u65ad \u6b64\u6811<\/strong> \u662f\u5426\u6b63\u786e\u3002<\/span><\/li>\n
              • recur(i\uff0cm-1)\uff1a\u5224\u65ad \u6b64\u6811\u7684\u5de6\u5b50\u6811<\/strong> \u662f\u5426\u6b63\u786e\u3002<\/span><\/li>\n
              • recur(m\uff0cj-1)\uff1a\u5224\u65ad \u6b64\u6811\u7684\u53f3\u5b50\u6811<\/strong> \u662f\u5426\u6b63\u786e\u3002<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                \u590d\u6742\u5ea6\u5206\u6790\uff1a<\/span><\/p>\n
                  \n
                • \u65f6\u95f4\u590d\u6742\u5ea6 O(N^2)\uff1a\u6bcf\u6b21\u8c03\u7528 recur(i\uff0cj) \u51cf\u53bb\u4e00\u4e2a\u6839\u8282\u70b9\uff0c\u56e0\u6b64\u9012\u5f52\u5360\u7528 O(N)\uff1b\u6700\u5dee\u60c5\u51b5\u4e0b\uff08\u5373\u5f53\u6811\u9000\u5316\u4e3a\u94fe\u8868\uff09\uff0c\u6bcf\u8f6e\u9012\u5f52\u90fd\u9700\u904d\u5386\u6811\u6240\u6709\u8282\u70b9\uff0c\u5360\u7528O(N)\u3002<\/span><\/li>\n
                • \u7a7a\u95f4\u590d\u6742\u5ea6 O(N)\uff1a\u6700\u5dee\u60c5\u51b5\u4e0b\uff08\u5373\u5f53\u6811\u9000\u5316\u4e3a\u94fe\u8868\uff09\uff0c\u9012\u5f52\u6df1\u5ea6\u5c06\u8fbe\u5230 N\u3002<\/span><\/li>\n<\/ul>\n\n\n
                  class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0bool\u00a0verifyPostorder(vector<int>&\u00a0postorder)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0recur(postorder,0,postorder.size()-1);\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0bool\u00a0recur(vector<int>&\u00a0postorder,int\u00a0i,int\u00a0j)\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5f53\u53ea\u6709\u4e00\u4e2a\u8282\u70b9\uff0c\u8fd4\u56detrue\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(i>=j)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0true;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/p\u7528\u6765\u5bfb\u627e\u5b50\u6811\u7d22\u5f15\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0p=i;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(postorder[p]<postorder[j])\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0p++;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/p\u505c\u4e0b\u7684\u5730\u65b9\u662f\u53f3\u5b50\u6811\u5f00\u59cb\u7684\u7d22\u5f15\uff0c\u7528m\u8bb0\u5f55\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0m=p;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(postorder[p]>postorder[j])\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0p++;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5982\u679c\u8be5\u540e\u7eed\u904d\u5386\u5e8f\u5217\u6b63\u786e\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5219p\u5e94\u8be5\u7b49\u4e8ej\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5982\u679c\u8be5\u5e8f\u5217\u6b63\u786e\uff08p==j\uff09\uff0c\u5219\u9012\u5f52\u904d\u5386\u5de6\u53f3\u5b50\u6811\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0p==j\u00a0&&\u00a0recur(postorder,i,m-1)\u00a0&&\u00a0recur(postorder,m,j-1);\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
                  \n\n\n
                  \u9762\u8bd5\u989834. \u4e8c\u53c9\u6811\u4e2d\u548c\u4e3a\u67d0\u4e00\u503c\u7684\u8def\u5f84<\/span><\/h1>\n
                  \u8f93\u5165\u4e00\u68f5\u4e8c\u53c9\u6811\u548c\u4e00\u4e2a\u6574\u6570\uff0c\u6253\u5370\u51fa\u4e8c\u53c9\u6811\u4e2d\u8282\u70b9\u503c\u7684\u548c\u4e3a\u8f93\u5165\u6574\u6570\u7684\u6240\u6709\u8def\u5f84\u3002\u4ece\u6811\u7684\u6839\u8282\u70b9\u5f00\u59cb\u5f80\u4e0b\u4e00\u76f4\u5230\u53f6\u8282\u70b9\u6240\u7ecf\u8fc7\u7684\u8282\u70b9\u5f62\u6210\u4e00\u6761\u8def\u5f84\u3002<\/span>
                  \u793a\u4f8b:<\/span>
                  \u7ed9\u5b9a\u5982\u4e0b\u4e8c\u53c9\u6811\uff0c\u4ee5\u53ca\u76ee\u6807\u548c sum = 22\uff0c<\/span><\/p>\n\n\n
                  \"\"<\/div><\/figure>\n\n\n
                  \u9898\u76ee\u89e3\u91ca\uff1a\u9898\u76ee\u7ed9\u51fa\u8def\u5f84\u7684\u5b9a\u4e49\uff1a\u6ee1\u8db3\u4ece\u6839\u8282\u70b9\u5230\u53f6\u5b50\u8282\u70b9\u8fd9\u4e00\u6761\u4ef6\uff0c\u4e5f\u5c31\u662f\u8bf4\u6839\u8282\u70b9\u5230\u4e2d\u95f4\u8282\u70b9\u4e0d\u7b97\u4e00\u6761\u8def\u5f84\uff0c\u54ea\u6015\u5b83\u4eec\u7684val\u52a0\u8d77\u6765\u7b49\u4e8esum\u3002<\/span><\/p>\n
                  \u601d\u8def\uff1a<\/span><\/strong><\/p>\n
                    \n
                  • \u5f88\u5bb9\u6613\u8054\u60f3\u5230\u7528DFS\u2014\u2014\u4ece\u6839\u8282\u70b9\u5f00\u59cb\u641c\u7d22\u5230\u53f6\u5b50\u8282\u70b9\uff0c\u5e76\u7528\u4e34\u65f6vector temp\u8bb0\u5f55\u6bcf\u4e2a\u8282\u70b9\u7684val\u548c\u5b83\u4eecval\u7684\u548c\u3002\uff08\u524d\u5e8f\u904d\u5386\uff09<\/span><\/li>\n
                  • \u5982\u679cval\u7684\u548c\u4e0eSum\u7684\u503c\u76f8\u7b49\uff0c\u5219\u5c06\u8bb0\u5f55\u7684\u8282\u70b9\u7684temp\u52a0\u5165\u8fdb\u7ed3\u679cvector res\u3002<\/span><\/li>\n
                  • \u5982\u679c\u641c\u7d22\u5230\u53f6\u5b50\u8282\u70b9\uff0c\u6ca1\u6709\u627e\u5230\u8def\u5f84\uff08\u8282\u70b9\u4e3a\u7a7a\uff09\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u3002<\/span><\/li>\n
                  • \u5728\u8fd4\u56de\u65f6\uff0ctemp\u6240\u8bb0\u5f55\u7684\u6700\u540e\u4e00\u4e2a\u503c\u5c06\u4f5c\u5e9f\uff0c\u6240\u4ee5\u8981\u5c06\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u51fa\u6808\u3002<\/span><\/li>\n<\/ul>\n
                    \u5173\u4e8e\u526a\u679d<\/strong>\uff1a
                    <\/span>\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u5728\u8282\u70b9\u7684val\u548c\u5927\u4e8eSum\u540e\u63d0\u524d\u8fd4\u56de\uff0c\u63d0\u9ad8\u6548\u7387\u5462\uff1f<\/span>
                    \u8fd9\u662f\u56e0\u4e3a\u6ca1\u6709\u8003\u8651\u5230\u6709\u8d1f\u6570\u7684\u60c5\u51b5\uff0c\u5728\u8282\u70b9\u7684val\u548c\u5927\u4e8eSum\u540e\uff0c\u82e5\u540e\u7eed\u8282\u70b9\u6709\u8d1f\u6570\uff0c\u4ecd\u7136\u53ef\u4ee5\u627e\u5230\u8def\u5f84\u3002
                    <\/span><\/p>\n
                    \u5173\u4e8e\u9012\u5f52\u8fd4\u56de\u540e\uff0c\u8282\u70b9val\u548c\u7684\u53d8\u5316<\/strong>\uff1a<\/span>
                    \u6211\u4eec\u7528\u53d8\u91cfcurrentSum\u6765\u5b58\u50a8\u8282\u70b9val\u548c\u3002\u5f53\u6211\u4eec\u68c0\u67e5\u4e00\u4e2a\u8282\u70b9\u65f6\uff0c\u5148\u5c06\u5b83\u7684val\u503c\u52a0\u5230currentSum\u91cc\u3002\u7136\u540e\u5224\u65adcurrentSum\u7684\u503c\u662f\u5426\u4e0eSum\u76f8\u7b49\uff0c\u82e5\u8be5\u7ed3\u70b9\u53c8\u6070\u597d\u662f\u53f6\u5b50\u8282\u70b9\uff0c\u5219\u627e\u5230\u4e00\u6761\u8def\u5f84\uff1b\u82e5currentSum\u7684\u503c\u4e0d\u4e0eSum\u76f8\u7b49\uff0c\u5b83\u53c8\u6070\u597d\u662f\u53f6\u5b50\u8282\u70b9\uff0c\u8fd9\u4e0d\u662f\u6211\u4eec\u8981\u627e\u7684\u8def\u5f84\uff0c\u56e0\u6b64\u5c31\u8981\u8fd4\u56de\u4e0a\u4e00\u5c42\u8c03\u7528\uff0c\u6709\u7684\u540c\u5b66\u53ef\u80fd\u89c9\u5f97currentSum\u7684\u503c\u540c\u6837\u9700\u8981\u6211\u4eec\u624b\u52a8\u56de\u6eaf\uff08\u51cf\u53bb\u8be5\u8282\u70b9\u7684val\uff09\uff0c\u4f46\u5176\u5b9e\u4e0d\u7136\uff0c\u5728\u9012\u5f52\u8c03\u7528\u51fd\u6570\u4e2d\uff0c\u4e0a\u4e00\u5c42\u51fd\u6570\u7684\u53d8\u91cf\u90fd\u5df2\u7ecf\u4fdd\u5b58\u5728\u6808\u91cc\uff0c\u8fd4\u56de\u540e\u4ecd\u7136\u662f\u8c03\u7528\u4e4b\u524d\u7684\u53d8\u91cf\u503c\uff0c\u8fd9\u91cc\u5c31\u514d\u53bb\u4e86\u4e00\u4e9b\u9ebb\u70e6\u3002<\/span><\/p>\n\n\n
                    class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0vector<vector<int>>\u00a0pathSum(TreeNode*\u00a0root,\u00a0int\u00a0sum)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0vector<vector<int>>\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0currentSum=0;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0vector<int>\u00a0temp;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(res,temp,root,sum,currentSum);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0void\u00a0dfs(vector<vector<int>>&\u00a0res,vector<int>&\u00a0temp,TreeNode*\u00a0node,int\u00a0sum,int\u00a0currentSum)\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(node==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0currentSum+=node->val;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0temp.push_back(node->val);\/\/\u5165\u6808\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(currentSum==sum\u00a0&&\u00a0node->left==NULL\u00a0&&\u00a0node->right==NULL)\/\/\u5982\u679c\u627e\u5230\u8def\u5f84\u5e76\u4e14\u662f\u53f6\u5b50\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0res.push_back(temp);\/\/\u52a0\u5165\u7ed3\u679cres\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(res,temp,node->left,sum,currentSum);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(res,temp,node->right,sum,currentSum);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0temp.pop_back();\/\/\u8fd4\u56de\u7236\u8282\u70b9\u65f6\u51fa\u6808\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
                    \n\n\n
                    \u9762\u8bd5\u989835. \u590d\u6742\u94fe\u8868\u7684\u590d\u5236<\/span><\/h1>\n
                    \u8bf7\u5b9e\u73b0 copyRandomList \u51fd\u6570\uff0c\u590d\u5236\u4e00\u4e2a\u590d\u6742\u94fe\u8868\u3002\u5728\u590d\u6742\u94fe\u8868\u4e2d\uff0c\u6bcf\u4e2a\u8282\u70b9\u9664\u4e86\u6709\u4e00\u4e2a next \u6307\u9488\u6307\u5411\u4e0b\u4e00\u4e2a\u8282\u70b9\uff0c\u8fd8\u6709\u4e00\u4e2a random \u6307\u9488\u6307\u5411\u94fe\u8868\u4e2d\u7684\u4efb\u610f\u8282\u70b9\u6216\u8005 null\u3002<\/span><\/p>\n\n\n
                    \"\"<\/div><\/figure>\n\n\n
                    \u8be5\u9898\u96be\u70b9\u5728\u4e8e\u65b0\u94fe\u8868 random<\/span> \u6307\u9488\u7684\u64cd\u4f5c\u3002<\/span><\/p>\n
                    \u601d\u8def\u4e00<\/strong>\uff1a\u7528\u54c8\u5e0c\u8868<\/p>\n
                    \u5148\u521b\u5efa\u65b0\u94fe\u8868\uff0c\u5c06\u5b83\u4eec\u7528 next\u6307\u9488<\/span> \u4e32\u8d77\u6765\uff0c\u8fd9\u4e00\u6b65\u5f88\u597d\u505a\u3002<\/span>
                    \u7136\u540e\u914d\u7f6e\u5b83\u4eec\u7684 random\u6307\u9488<\/span> \uff0c\u5982\u679c\u8981\u628a\u65f6\u95f4\u590d\u6742\u5ea6\u964d\u4f4e\u5230O(N)\uff0c\u5219\u9700\u8981\u4f7f\u7528\u54c8\u5e0c\u8868\u2014\u2014\u521b\u5efa\u6620\u5c04\u5173\u7cfb\u4e3a <\u65e7\u8282\u70b9N\uff0c\u65b0\u8282\u70b9N\u2019><\/span> \u7684\u54c8\u5e0c\u8868\uff0c\u53ea\u8981\u6211\u4eec\u627e\u5230 N<\/span> \u7684 random\u6307\u9488<\/span> \u6240\u6307\u5411\u7684\u8282\u70b9 S <\/span>\uff0c\u5c31\u80fd\u627e\u5230 S\u2019<\/span>\uff0c\u800c\u8fd9\u4e2a S\u2019<\/span>\u5c31\u662f N\u2019<\/span>\u7684random\u6307\u9488\u6240\u8981\u6307\u5411\u7684 \u8282\u70b9<\/strong> \u3002
                    \u540c\u7406\uff0c\u5728\u914d\u7f6erandom\u6307\u9488\u4e4b\u524d\u914d\u7f6enext\u6307\u9488\u65f6\uff0c\u4e5f\u662f\u7528\u540c\u6837\u7684\u65b9\u6cd5\u2014\u2014\u627e\u5230 N<\/span> \u7684 next\u6307\u9488 \u6240\u6307\u5411\u7684\u8282\u70b9 S <\/span>\uff0c\u4e5f\u5c31\u627e\u5230\u4e86 S\u2019<\/span>\uff0c\u5c06S\u2019\u8d4b\u503c\u7ed9N\u2019\u7684next\u6307\u9488\u3002
                    <\/span><\/p>\n\n\n
                    \/*\n\/\/\u00a0Definition\u00a0for\u00a0a\u00a0Node.\nclass\u00a0Node\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0int\u00a0val;\n\u00a0\u00a0\u00a0\u00a0Node*\u00a0next;\n\u00a0\u00a0\u00a0\u00a0Node*\u00a0random;\n\u00a0\u00a0\u00a0\u00a0\n\u00a0\u00a0\u00a0\u00a0Node(int\u00a0_val)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0val\u00a0=\u00a0_val;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0next\u00a0=\u00a0NULL;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0random\u00a0=\u00a0NULL;\n\u00a0\u00a0\u00a0\u00a0}\n};\n*\/\nclass\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0Node*\u00a0copyRandomList(Node*\u00a0head)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(head==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0NULL;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/<\u65e7\u94fe\u8868\u8282\u70b9\uff0c\u65b0\u94fe\u8868\u8282\u70b9>\u5bf9\u5e94\u5173\u7cfb\u7684\u54c8\u5e0c\u8868\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0unordered_map<Node*,Node*>mp;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Node*\u00a0cur=head;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(cur!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mp[cur]=new\u00a0Node(cur->val);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u4e0a\u4e00\u53e5\u4e2d\uff0ccur\u662fkey\u503c\uff0cmp[cur]\u662f\u6620\u5c04\u503c\uff0c\u5efa\u7acb\u6620\u5c04\u5173\u7cfb\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur=cur->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur=head;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(cur!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(cur->next!=NULL)\/\/\u6700\u540e\u4e00\u4e2a\u8282\u70b9\u7684next\u5df2\u7ecf\u662fNULL\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mp[cur]->next=mp[cur->next];\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/cur->next\u662f\u539f\u8282\u70b9N\uff0cmp[cur->next]\u662f\u65b0\u8282\u70b9N'\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5c06\u539f\u8282\u70b9N\u7684next\u6307\u9488\u6307\u5411\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9S\u6240\u5bf9\u5e94\u7684\u65b0\u7ed3\u70b9S'\uff0c\u8d4b\u503c\n\u7ed9\u539f\u8282\u70b9N\u6240\u5bf9\u5e94\u7684\u65b0\u8282\u70b9N'\u7684next\u6307\u9488\u6307\u5411\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(cur->random!=NULL)\/\/\u53ea\u7528\u8003\u8651\u4e0d\u4e3aNULL\u7684\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mp[cur]->random=mp[cur->random];\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur=cur->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0mp[head];\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n
                    \u4ee3\u7801\u4e2d\u7b2c\u4e00\u4e2a\u5faa\u73af\u662f\u5efa\u7acb <N\uff0cN\u2019><\/span> \u5173\u7cfb\uff0c\u7b2c\u4e8c\u4e2a\u5faa\u73af\u662f\u914d\u7f6enext\u548crandom\u6307\u9488\u3002<\/span><\/p>\n
                    \u601d\u8def\u4e8c<\/strong>\uff1a\u5728\u4e0d\u4f7f\u7528\u8f85\u52a9\u7a7a\u95f4\u7684\u60c5\u51b5\u4e0b\u5b9e\u73b0O(N)\u7684\u65f6\u95f4\u6548\u7387\u3002<\/span><\/p>\n
                      \n
                    • \u590d\u5236\u8282\u70b9<\/strong>\uff1a\u5c06\u539f\u59cb\u94fe\u8868\u7684\u4efb\u610f\u8282\u70b9 N <\/span>\u590d\u5236\u4e3a\u65b0\u7ed3\u70b9 N’<\/span> \uff0c\u518d\u628a N’ \u8fde\u63a5\u5230 N \u7684\u540e\u9762\u3002\u5373\u5982\u679c\u539f\u59cb\u94fe\u8868\u4e3a A->B->C->D<\/span> \u5219\u590d\u5236\u8fc7\u540e\u4e3a 
                      A->A’->B->B’->C->C’->D->D’<\/span><\/span><\/li>\n
                    • \u786e\u5b9a\u6bcf\u4e2a\u65b0\u8282\u70b9 N’ \u7684random\u6307\u9488\u6307\u5411\uff1a<\/span><\/strong>
                      \u663e\u7136\uff0c\u5982\u679c\u539f\u59cb\u94fe\u8868\u4e0a\u7684\u8282\u70b9 N \u7684 random \u6307\u9488\u6307\u5411\u8282\u70b9 S \uff0c\u5219\u5b83\u5bf9\u5e94\u7684\u590d\u5236\u8282\u70b9 N’ \u7684 random\u6307\u9488 \u6307\u5411\u8282\u70b9 S \u7684\u590d\u5236\u8282\u70b9 S’ \uff0c\u4e5f\u5c31\u662f\u5f53\u524d\u8282\u70b9 S \u7684 \u4e0b\u4e00\u4e2a\u8282\u70b9 <\/strong>\u3002<\/span><\/li>\n
                    • \u62c6\u5206\u94fe\u8868<\/strong>\uff1a<\/span>
                      \u628a\u8fd9\u4e2a\u957f\u94fe\u8868\u62c6\u5206\u6210\u4e24\u4e2a\u94fe\u8868\uff0c\u628a\u5947\u6570\u4f4d\u7f6e\u7684\u8282\u70b9\u8fde\u63a5\u8d77\u6765\u5c31\u662f\u539f\u59cb\u94fe\u8868\uff0c\u628a\u5076\u6570\u4f4d\u7f6e\u7684\u8282\u70b9\u8fde\u63a5\u8d77\u6765\u5c31\u662f\u590d\u5236\u51fa\u6765\u7684\u94fe\u8868\u3002<\/span><\/li>\n<\/ul>\n
                      \u6ce8\u610f\uff1a\u6b64\u65f6\u5728\u5f97\u5230\u590d\u5236\u94fe\u8868\u7684\u540c\u65f6\uff0c\u4e0d\u8981\u5fd8\u8bb0\u5c06\u539f\u6709\u94fe\u8868\u8fdb\u884c\u590d\u539f\u3002<\/span><\/strong><\/p>\n\n\n
                      class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0Node*\u00a0copyRandomList(Node*\u00a0head)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(head==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0NULL;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Node*\u00a0cur=head;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(cur!=NULL)\/\/\u590d\u5236\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Node*\u00a0temp=new\u00a0Node(cur->val);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0temp->next=cur->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur->next=temp;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur=cur->next->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur=head;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(cur!=NULL)\/\/\u914d\u7f6erandom\u6307\u9488\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(cur->random!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur->next->random=cur->random->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur=cur->next->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u62c6\u5206\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Node*\u00a0res=head->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Node*\u00a0tem=head->next;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0head->next=head->next->next;\/\/\u51c6\u5907\u5de5\u4f5c\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0head=head->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while(head!=NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tem->next=head->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0head->next=head->next->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0head=head->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tem=tem->next;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
                      \n\n\n
                      \u9762\u8bd5\u989836. \u4e8c\u53c9\u641c\u7d22\u6811\u4e0e\u53cc\u5411\u94fe\u8868<\/span><\/h1>\n
                      \u8f93\u5165\u4e00\u68f5\u4e8c\u53c9\u641c\u7d22\u6811\uff0c\u5c06\u8be5\u4e8c\u53c9\u641c\u7d22\u6811\u8f6c\u6362\u6210\u4e00\u4e2a\u6392\u5e8f\u7684\u5faa\u73af\u53cc\u5411\u94fe\u8868\u3002\u8981\u6c42\u4e0d\u80fd\u521b\u5efa\u4efb\u4f55\u65b0\u7684\u8282\u70b9\uff0c\u53ea\u80fd\u8c03\u6574\u6811\u4e2d\u8282\u70b9\u6307\u9488\u7684\u6307\u5411\u3002<\/span>
                      \u6211\u4eec\u5e0c\u671b\u5c06\u8fd9\u4e2a\u4e8c\u53c9\u641c\u7d22\u6811\u8f6c\u5316\u4e3a\u53cc\u5411\u5faa\u73af\u94fe\u8868\u3002\u94fe\u8868\u4e2d\u7684\u6bcf\u4e2a\u8282\u70b9\u90fd\u6709\u4e00\u4e2a\u524d\u9a71\u548c\u540e\u7ee7\u6307\u9488\u3002\u5bf9\u4e8e\u53cc\u5411\u5faa\u73af\u94fe\u8868\uff0c\u7b2c\u4e00\u4e2a\u8282\u70b9\u7684\u524d\u9a71\u662f\u6700\u540e\u4e00\u4e2a\u8282\u70b9\uff0c\u6700\u540e\u4e00\u4e2a\u8282\u70b9\u7684\u540e\u7ee7\u662f\u7b2c\u4e00\u4e2a\u8282\u70b9\u3002<\/span>
                      \u7279\u522b\u5730\uff0c\u6211\u4eec\u5e0c\u671b\u53ef\u4ee5\u5c31\u5730\u5b8c\u6210\u8f6c\u6362\u64cd\u4f5c\u3002\u5f53\u8f6c\u5316\u5b8c\u6210\u4ee5\u540e\uff0c\u6811\u4e2d\u8282\u70b9\u7684\u5de6\u6307\u9488\u9700\u8981\u6307\u5411\u524d\u9a71\uff0c\u6811\u4e2d\u8282\u70b9\u7684\u53f3\u6307\u9488\u9700\u8981\u6307\u5411\u540e\u7ee7\u3002\u8fd8\u9700\u8981\u8fd4\u56de\u94fe\u8868\u4e2d\u7684\u7b2c\u4e00\u4e2a\u8282\u70b9\u7684\u6307\u9488\u3002<\/span><\/p>\n\n\n
                      \"\"<\/div><\/figure>\n\n\n
                      \u601d\u8def<\/strong>\uff1a
                      \u8be5\u9898\u8981\u6c42\u5c06\u4e8c\u53c9\u641c\u7d22\u6811\u8f6c\u6362\u6210\u6392\u5e8f\u53cc\u5411\u94fe\u8868\uff0c\u901a\u8fc7\u4e86\u89e3\u4e8c\u53c9\u641c\u7d22\u6811\u7684\u6027\u8d28\u53ef\u77e5\uff0c\u7528\u4e2d\u5e8f\u904d\u5386<\/strong>\u7684\u65b9\u6cd5\u53ef\u4ee5\u83b7\u5f97\u6392\u5e8f\u5e8f\u5217<\/strong>\u3002\u56e0\u6b64\u6211\u4eec\u5c06\u7528\u4e2d\u5e8f\u904d\u5386\u7684\u65b9\u6cd5DFS\u4e8c\u53c9\u641c\u7d22\u6811\uff0c\u540c\u65f6\u7528\u4e00\u4e2apre\u6307\u9488\u6765\u8bb0\u5f55\uff0c\u5728\u904d\u5386\u987a\u5e8f\u4e0a\uff0c\u5f53\u524d\u8282\u70b9cur\u7684\u4e0a\u4e00\u4e2a\u8282\u70b9\uff08\u5982cur\u9012\u5f52\u8fd4\u56de\u52302\uff0cpre\u7559\u57281\uff1bcur\u9012\u5f52\u52303\uff0cpre\u7559\u57282\uff09\uff0c\u518d\u901a\u8fc7\u8fd9\u4e24\u4e2a\u6307\u9488\u6765\u5b8c\u6210\u94fe\u8868\u7684\u6784\u9020\u5de5\u4f5c\u3002<\/span><\/p>\n
                      \u7ec6\u8282\uff1a<\/span><\/p>\n
                        \n
                      • \u5982\u4f55\u786e\u5b9a\u94fe\u8868\u5934\u7ed3\u70b9<\/strong>\uff1a\u4e00\u5f00\u59cb\uff0c\u5148\u7533\u8bf7\u5934\u6307\u9488head\uff0c\u6267\u884cDFS\uff0c\u5f53\u5bf9\u8282\u70b9\u8fdb\u884c\u64cd\u4f5c\u65f6\u67e5\u770bpre\u662f\u5426\u662fnull\uff0c\u5982\u679c\u662f\uff0c\u5219\u8bf4\u660e\u5f53\u524d\u94fe\u8868\u4e3a\u7a7a\uff0c\u8be5\u8282\u70b9\u662f\u5934\u8282\u70b9\uff0c\u5c06\u5176\u8d4b\u503c\u7ed9head\uff1b\u5982\u679c\u4e0d\u662f\uff0c\u5219\u6267\u884c\u6b63\u5e38\u7684\u94fe\u8868\u8282\u70b9\u8fde\u63a5\u5de5\u4f5c\u3002<\/span><\/li>\n
                      • \u5982\u4f55\u5c06\u5934\u7ed3\u70b9\u548c\u5c3e\u8282\u70b9\u8fde\u63a5\u8d77\u6765\uff1aDFS\u6267\u884c\u5b8c\u6bd5\u540e\uff0cpre\u6307\u9488\u6307\u5411\u7684\u662f\u94fe\u8868\u7684\u5c3e\u8282\u70b9\uff0c\u901a\u8fc7\u8fd9\u4e2a\u4fe1\u606f\uff0c\u53ef\u4ee5\u5bf9pre\u6307\u9488\u548chead\u6307\u9488\u8fdb\u884c\u64cd\u4f5c\uff0c\u8fde\u63a5\u5934\u5c3e\u8282\u70b9\u3002<\/span><\/li>\n<\/ul>\n\n\n
                        class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0Node*\u00a0pre,*head;\/\/\u524d\u5e8f\u6307\u9488\u548c\u5934\u6307\u9488\u5728\u4e24\u4e2a\u51fd\u6570\u91cc\u90fd\u4f1a\u7528\u5230\uff0c\u7533\u8bf7\u4e3a\u5168\u5c40\u53d8\u91cf\n\u00a0\u00a0\u00a0\u00a0Node*\u00a0treeToDoublyList(Node*\u00a0root)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(root==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0NULL;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(root);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u8fde\u63a5\u5934\u8282\u70b9\u548c\u5c3e\u8282\u70b9\uff0c\u6700\u540e\u662fpre\u6307\u9488\u6307\u5411\u5c3e\u7ed3\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0head->left=pre;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0pre->right=head;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0head;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0void\u00a0dfs(Node*\u00a0cur)\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(cur==NULL)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(cur->left);\/\/\u4e2d\u5e8f\u904d\u5386\uff0c\u5148\u8bbf\u95ee\u5de6\u5b50\u6811\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u8fd4\u56de\u7236\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(pre==NULL)\/\/pre\u4e3a\u7a7a\uff0c\u8bf4\u660e\u627e\u5230\u4e86\u94fe\u8868\u7b2c\u4e00\u4e2a\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0head=cur;\u00a0\/\/\u5934\u6307\u9488\u6307\u5411\u7b2c\u4e00\u4e2a\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0else\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u8fde\u63a5\u524d\u9a71\u8282\u70b9\u548c\u5b69\u5b50\u8282\u70b9\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0pre->right=cur;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0cur->left=pre;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0pre=cur;\/\/\u524d\u5e8f\u6307\u9488\u79fb\u52a8\u5230cur\u6307\u9488\u4e0a\u505a\u8bb0\u5f55\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(cur->right);\/\/\u8bbf\u95ee\u53f3\u5b50\u6811\n\u00a0\u00a0\u00a0\u00a0}\n};<\/pre>\n\n\n\n
                        \n\n\n
                        \u9762\u8bd5\u989838. \u5b57\u7b26\u4e32\u7684\u6392\u5217<\/span><\/h1>\n
                        \u8f93\u5165\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u6253\u5370\u51fa\u8be5\u5b57\u7b26\u4e32\u4e2d\u5b57\u7b26\u7684\u6240\u6709\u6392\u5217\u3002<\/span>
                        \u4f60\u53ef\u4ee5\u4ee5\u4efb\u610f\u987a\u5e8f\u8fd4\u56de\u8fd9\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\uff0c\u4f46\u91cc\u9762\u4e0d\u80fd\u6709\u91cd\u590d\u5143\u7d20\u3002<\/span><\/p>\n\n\n
                        \"\"<\/div><\/figure>\n\n\n
                        \u601d\u8def<\/strong>\uff1aDFS\u56de\u6eaf<\/span><\/p>\n
                        \u793a\u4f8b\u4e2d\u7684\u5b57\u7b26\u4e32\u201cabc\u201d\uff0c\u5982\u679c\u770b\u505a\u6811\uff0c\u80fd\u591f\u5f88\u597d\u7406\u89e3\u7528DFS\u89e3\u51b3\uff1a\u5f53\u786e\u5b9a\u4e00\u4e2a\u6839\u8282\u70b9a\uff0c\u90a3\u4e48\u5c06\u5206\u51fa\u4e24\u6761\u8def\uff08\u53ea\u5269\u4e0b\u4e24\u4e2a\u5b57\u7b26\uff09b\u3001c\uff0c\u7136\u540e\u5411\u4e0b\u9012\u5f52\uff0c\u518d\u786e\u5b9a\u4e00\u4e2a\u6839\u8282\u70b9b\u6216\u8005c\uff0c\u518d\u6b21\u5206\u8def\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002<\/span>
                        \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 \u5b57\u7b26\u4ea4\u6362<\/strong> \uff0c\u5148\u56fa\u5b9a\u7b2c1\u4f4d\u5b57\u7b26\uff08n\u79cd\u60c5\u51b5\uff09\u3001\u518d\u56fa\u5b9a\u7b2c2\u4f4d\u5b57\u7b26\uff08n-1\u79cd\u60c5\u51b5\uff09\u3001\u2026\u2026\u3001\u6700\u540e\u56fa\u5b9a\u7b2cn\u4f4d\u5b57\u7b26\uff081\u79cd\u60c5\u51b5\uff09\u3002<\/span><\/p>\n\n\n
                        \"\"<\/div><\/figure>\n\n\n
                        \u91cd\u590d\u65b9\u6848\u4e0e\u526a\u679d<\/strong>\uff1a\u5f53\u5b57\u7b26\u4e32\u5b58\u5728\u91cd\u590d\u5b57\u7b26\u65f6\uff0c\u6392\u5217\u65b9\u6848\u4e2d\u4e5f\u5b58\u5728\u91cd\u590d\u65b9\u6848\u3002\u4e3a\u6392\u9664\u91cd\u590d\u65b9\u6848\uff0c\u9700\u5728\u56fa\u5b9a\u67d0\u4f4d\u5b57\u7b26\u65f6\uff0c\u4fdd\u8bc1\u201c\u6bcf\u79cd\u5b57\u7b26\u53ea\u5728\u6b64\u4f4d\u56fa\u5b9a\u4e00\u6b21\u201d\uff0c\u5373\u9047\u5230\u91cd\u590d\u5b57\u7b26\u65f6\u4e0d\u4ea4\u6362\uff0c\u76f4\u63a5\u8df3\u8fc7\u3002\u4eceDFS\u89d2\u5ea6\u770b\uff0c\u6b64\u64cd\u4f5c\u79f0\u4e3a\u201c\u526a\u679d\u201d\u3002<\/span><\/p>\n\n\n
                        \"\"<\/div><\/figure>\n\n\n
                        \u9012\u5f52\u89e3\u6790<\/strong>\uff1a<\/span><\/p>\n
                          \n
                        • \u7ec8\u6b62\u6761\u4ef6<\/strong>\uff1a\u5f53\u56fa\u5b9a\u4f4d\u7d22\u5f15 x = \u5b57\u7b26\u4e32\u6700\u540e\u4e00\u4f4d\u7d22\u5f15<\/span> \u65f6\uff0c\u5219\u5c06\u5f53\u524d\u7ec4\u5408\u52a0\u5165\u7ed3\u679c\u3002<\/span><\/li>\n
                        • \u9012\u63a8\u53c2\u6570<\/strong>\uff1a\u5f53\u524d\u56fa\u5b9a\u4f4d x <\/span>\u3002<\/span><\/li>\n
                        • \u9012\u63a8\u5de5\u4f5c<\/strong>\uff1a\u521d\u59cb\u5316\u4e00\u4e2a set<\/span> \uff0c\u7528\u4e8e\u6392\u9664\u91cd\u590d\u7684\u5b57\u7b26\uff1b\u5c06\u7b2c x <\/span>\u4f4d\u5b57\u7b26\u4e0e<\/span>
                          i\u2208[x\uff0clen\uff08\u5b57\u7b26\u4e32\uff09]\u5b57\u7b26\u5206\u522b\u4ea4\u6362\uff0c\u5e76\u8fdb\u5165\u4e0b\u5c42\u9012\u5f52\uff08\u5206\u8def\uff09\uff1b<\/span>\n
                            \n
                          • \u526a\u679d\uff1a\u82e5\u5f53\u524d\u5b57\u7b26\u5728 set<\/span> \u4e2d\uff0c\u4ee3\u8868\u5176\u662f\u91cd\u590d\u5b57\u7b26\uff0c\u56e0\u6b64\u526a\u679d\u3002<\/span><\/li>\n
                          • \u5c06\u5f53\u524d\u5b57\u7b26\u52a0\u5165 set <\/span>\uff0c\u4ee5\u4fbf\u4e4b\u540e\u5bf9\u91cd\u590d\u5b57\u7b26\u526a\u679d\u3002<\/span><\/li>\n
                          • \u56fa\u5b9a\u5b57\u7b26\uff1a\u5c06\u5b57\u7b26 [x]<\/span> \u548c [i]<\/span> \u4ea4\u6362\uff0c\u5373\u56fa\u5b9a [i]<\/span> \u4e3a\u5f53\u524d\u4e3a\u5b57\u7b26\u3002<\/span><\/li>\n
                          • \u5f00\u542f\u4e0b\u5c42\u9012\u5f52\uff1a\u8c03\u7528dfs(x+1)\uff0c\u5373\u5f00\u59cb\u56fa\u5b9a\u7b2c x+1 \u4e2a\u5b57\u7b26\u3002<\/span><\/li>\n
                          • \u8fd8\u539f\u4ea4\u6362\uff1a\u9012\u5f52\u8fd4\u56de\u540e\uff0c\u5c06\u5b57\u7b26[i]\u548c[x]\u4ea4\u6362\uff0c\u8fd8\u539f\u4e4b\u524d\u7684\u4ea4\u6362<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n
                            class\u00a0Solution\u00a0{\npublic:\n\u00a0\u00a0\u00a0\u00a0vector<string>\u00a0res;\/\/\u7ed3\u679cvector\uff0c\u5b9a\u4e49\u5728\u51fd\u6570\u5916\u65b9\u4fbf\u4e24\u4e2a\u51fd\u6570\u4f7f\u7528\n\u00a0\u00a0\u00a0\u00a0string\u00a0c;\/\/s\u7684\u62f7\u8d1d\uff0c\u4e5f\u662f\u4e3a\u4e86\u65b9\u4fbf\u51fd\u6570\u4f7f\u7528\uff0c\u51cf\u5c11dfs\u53c2\u6570\n\u00a0\u00a0\u00a0\u00a0vector<string>\u00a0permutation(string\u00a0s)\u00a0\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(s.empty())\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5c06\u5b57\u7b26\u4e32s\u62f7\u8d1d\u7ed9c\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0c=s;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(0);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0res;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0\/\/x\u4e3a\u5f53\u524d\u56fa\u5b9a\u5b57\u7b26\u7684\u7d22\u5f15\n\u00a0\u00a0\u00a0\u00a0void\u00a0dfs(int\u00a0x)\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5982\u679c\u5df2\u7ecf\u5230\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u4e86\uff0c\u5c06\u7ed3\u679c\u4fdd\u5b58\u8fdbres\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(x==c.size()-1)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0res.push_back(c);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u4e0d\u662f\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u7684\u8bdd\uff0c\u51c6\u5907set\uff0c\u8f85\u52a9\u526a\u679d\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0set<char>\u00a0char_set;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u8fd9\u91cc\u5c31\u5f88\u5de7\u5999\u4e86,\u7b2c\u4e00\u5c42\u53ef\u4ee5\u662fa,b,c\u90a3\u4e48\u5c31\u6709\u4e09\u79cd\u60c5\u51b5\uff0c\u8fd9\u91cci\u00a0=\u00a0x,\u6b63\u5de7dfs(0)\uff0c\u6b63\u597di\u00a0=\u00a00\u5f00\u59cb\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5f53\u7b2c\u4e8c\u5c42\u53ea\u6709\u4e24\u79cd\u60c5\u51b5\uff0cdfs(1\uff09i\u00a0=\u00a01\u5f00\u59cb\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for(int\u00a0i=x;i<c.size();++i)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5982\u679c\u5df2\u7ecf\u662f\u91cd\u590d\u7684\u5b57\u7b26\uff0c\u526a\u679d\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(char_set.count(c[i])==1)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0continue;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u4e0d\u662f\u7684\u8bdd\uff0c\u6dfb\u52a0\u8fdbset\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0char_set.insert(c[i]);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5c06c[i]\u4e0ec[x]\u4ea4\u6362\uff0c\u5b9e\u73b0\u5206\u8def\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u8fd9\u91cc\u5f88\u662f\u5de7\u5999\uff0c\u5f53\u5728\u7b2c\u4e8c\u5c42dfs(1),x\u00a0=\u00a01,\u90a3\u4e48i\u00a0=\u00a01\u6216\u8005\u00a02\uff0c\u00a0\u8981\u4e0d\u662f\u4ea4\u63621\u548c1\uff0c\u8981\u4e0d\u4ea4\u63621\u548c2\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0swap(c[i],c[x]);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5206\u8def\u540e\uff0c\u5411\u4e0b\u9012\u5f52\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dfs(x+1);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u9012\u5f52\u8fd4\u56de\u540e\uff0c\u6062\u590d\u4ea4\u6362\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0swap(c[i],c[x]);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u8fd4\u56de\u65f6\u4ea4\u6362\u56de\u6765\uff0c\u8fd9\u6837\u4fdd\u8bc1\u5230\u8fbe\u7b2c1\u5c42\u7684\u65f6\u5019\uff0c\u4e00\u76f4\u90fd\u662fabc\u3002\u8fd9\u91cc\u634b\u987a\u4e00\u4e0b\uff0c\u5f00\u59cb\u4e00\u76f4\u90fd\u662fabc\uff0c\u90a3\u4e48\u7b2c\u4e00\u4f4d\u7f6e\u603b\u5171\u5c313\u4e2a\u4f4d\u7f6e\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u5206\u522b\u662fa\u4e0ea\u4ea4\u6362\uff0c\u8fd9\u4e2a\u5c31\u76f8\u5f53\u4e8e\u00a0x\u00a0=\u00a00,\u00a0i\u00a0=\u00a00;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u00a0\u00a0\u00a0\u00a0a\u4e0eb\u4ea4\u6362\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0x\u00a0=\u00a00,\u00a0i\u00a0=\u00a01;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u00a0\u00a0\u00a0\u00a0a\u4e0ec\u4ea4\u6362\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0x\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                            \n","protected":false},"excerpt":{"rendered":"
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