# 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):
        if p == None and q == None:
            return True
        elif p == None:
            return False
        elif q == None:
            return False
        elif p.val != q.val:
            return False
        else:
            return self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right)


t1 = TreeNode(1)
t1.left = TreeNode(2)
t1.right = TreeNode(3)
t2 = TreeNode(1)
t2.left = TreeNode(2)
t2.right = TreeNode(3)
s = Solution()
print("Expected: True")
print("Got:", s.isSameTree(t1, t2))