isSameTree

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->val != q->val)
		 return false;
		 if(isSameTree(p->right,q->right)==false)
		 	return false;
		if(isSameTree(p->left,q->left)==false)
		 	return false;
        return true;
    }
};