100. Same Tree

/**
* Definition for a binary tree node.
* 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;
else if(p==NULL||q==NULL) return false;
if(isSameTree(p->left,q->left)&&isSameTree(p->right,q->right)&&p->val==q->val) return true;
return false;
}
};