# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None

class Solution:
    def isSameTree(self, p, q):
        """
        :type p: TreeNode
        :type q: TreeNode
        :rtype: bool
        """
        if p == None and q == None:
            return True
        elif p is not None and q is not None:
            if p.val == q.val:
                return self.isSameTree(p.left,q.left) and self.isSameTree(p.right,q.right)
            else:
                return False
        else:
            return False