Leetcode: Same Tree

http://oj.leetcode.com/problems/same-tree/

/** * Definition for binary tree * struct TreeNode { *     int val; *     TreeNode *left; *     TreeNode *right; *     TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public:    bool isSameTree(TreeNode *p, TreeNode *q) {       if(p==NULL&&q==NULL) return true;       if(p==NULL&&q!=NULL) return false;       if(p!=NULL&&q==NULL) return false;       if(!isSameTree(p->left, q->left)) return false;       if(!isSameTree(p->right, q->right)) return false;       if(p->val!=q->val) return false;       return true;    }};