/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; *

Posted 2020-09-06 爱编程的小羊

/**
 * Definition for binary tree
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    TreeNode* reConstructBinaryTree(vector<int> pre,vector<int> vin) {
                  if(pre.size()==0||vin.size()==0)
                             return NULL;
                         TreeNode*  p=new TreeNode(pre[0]);
                            int i;
              for(i=0;i<vin.size();i++)
                  if(pre[0]==vin[i])
                      break;
               vector<int> left_pre,left_vin,right_pre,right_vin;
                 for(int j=0;j<i;j++)
                 {left_pre.push_back(pre[j+1]);
                         left_vin.push_back(vin[j]);}
              
                for(int j=i+1;j<pre.size();j++)
                {right_pre.push_back(pre[j]);
                         right_vin.push_back(vin[j]);}
                 p->left=reConstructBinaryTree(left_pre,left_vin);
                 p->right=reConstructBinaryTree(right_pre,right_vin);
               return p;          
    }
};