Same Tree

 1 /**
 2  * Definition for binary tree
 3  * struct TreeNode {
 4  *     int val;
 5  *     TreeNode *left;
 6  *     TreeNode *right;
 7  *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 8  * };
 9  */
10 class Solution {
11 public:
12     bool isSameTree(TreeNode *p, TreeNode *q) 
13     {
14         if(p == NULL && q == NULL)
15             return true;
16             
17         while(p != NULL && q != NULL)
18         {
19             if(p->val == q->val)
20             {
21                 bool leftTree = isSameTree(p->left, q->left);
22                 bool rightTree = isSameTree(p->right, q->right);
23                 return leftTree && rightTree;
24             }
25             
26             else
27                 return false;
28         }
29         
30         return false;
31     }
32 };