【LeetCode with Python】 Same Tree

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原题页面：https://oj.leetcode.com/problems/same-tree/

题目类型：递归，回溯，DFS

难度评价：★

本文地址：/article/1377553.html

Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

判断两个二叉树是否相等。常见的二叉树递归回溯算法。

class Solution:

    # @param p, a tree node
    # @param q, a tree node
    # @return a boolean
    def isSameTree(self, p, q):
        if None == p and None == q:
            return True
        elif (None == p and None != q) or (None != p and None == q):
            return False
        else:
            return p.val == q.val and self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right)