A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalued. Example 1: Input: [1,1,1,1,1,null,1] Output: true Example 2: Input: [2,2,2,5,2] Output: false Note: The number of nodes i…

题目要求 A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalued. 题目分析及思路 题目要求当输入的二叉树的每个结点都有相同的值则返回true,否则返回false.可以使用队列保存每个节点,用val保存root节点的值.如果弹出的数字不等于val不等于root节点就立刻返回false.如果全部判断完…

problem 965. Univalued Binary Tree 参考 1. Leetcode_easy_965. Univalued Binary Tree; 完…

题目来源: https://leetcode.com/problems/univalued-binary-tree/submissions/ 自我感觉难度/真实难度: 题意: 分析: 自己的代码: class Solution(object): def isUnivalTree(self, root): """ :type root: TreeNode :rtype: bool """ return self.dsf(root.val,root)…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 BFS DFS 日期 题目地址:https://leetcode.com/problems/univalued-binary-tree/ 题目描述 A binary tree is univalued if every node in the tree has the same value. Return true if and only if th…

题目如下: A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalued. Example 1: Input: [1,1,1,1,1,null,1] Output: true Example 2: Input: [2,2,2,5,2] Output: false Note: The number of n…

A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univalued. 太简单了,签到题.…

Problem Link: http://oj.leetcode.com/problems/binary-tree-postorder-traversal/ The post-order-traversal of a binary tree is a classic problem, the recursive way to solve it is really straightforward, the pseudo-code is as follows. RECURSIVE-POST-ORDE…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 来源: https://leetcode.com/problems/binary-tree-level-order-traversal-ii/ Given a binary tree, return the bottom-up level order traversal of its nodes' values.…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 来源: https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/ Given a binary tree, return the zigzag level order traversal of its nodes' values…