递归
# Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right class Solution: def isSameTree(self, p: TreeNode, q: TreeNode) -> bool: if not p and not q: return True if not p: return False if not q: return False if p.val != q.val: return False return self.isSameTree(p.left,q.left) and self.isSameTree(p.right,q.right)