要求 求一棵二叉树的最高深度 思路 递归地求左右子树的最高深度 实现 1 Definition for a binary tree node. 2 struct TreeNode { 3 int val; 4 TreeNode *left; 5 TreeNode *right; 6 TreeNode(int x) : val(x), left(NULL), right(NULL) {} 7 }; 8 9 class Solution { 10 public: 11 int maxDepth(Tr…

题目: https://leetcode.com/problems/maximum-depth-of-n-ary-tree/description/ n-ary-tree的数据结果表示 // Definition for a Node. class Node { public: int val; vector<Node*> children; Node() {} Node(int _val, vector<Node*> _children) { val = _val; childr…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

题目 Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 分析 很简单的题目,求二叉树的高度. AC代码 /** * Definition for a binary tree node. * struct TreeNode { *…

Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 给出二叉树的中序遍历和后序遍历结果,恢复出二叉树. 后序遍历序列的最后一个元素值是二叉树的根节点的值.查找该元素在中序遍历序列中的位置mid,依据中序遍历和后序遍历性质.有: 位置mid曾经的序列部分为二叉树根节点左子树中…

题目链接 一A,开森- ac代码: class TrieNode { // Initialize your data structure here. char content; boolean isWord; int count; LinkedList<TrieNode> childList; public TrieNode(char c) { content = c; isWord = false; count = 0; childList = new LinkedList<TrieN…

LeetCode:Minimum Depth of Binary Tree Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. 算法1:dfs递归的求解 class Solution { public: int minDepth(T…

Maximum Depth of Binary Tree Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 求二叉树的高度,即从根节点到叶节点上所有节点的数量. 解题思路: 这题是难度系数1,频率1的题目……用到的知识点是二叉树D…

258. Add Digits Digit root 数根问题 /** * @param {number} num * @return {number} */ var addDigits = function(num) { var b = (num-1) % 9 + 1 ; return b; }; //之所以num要-1再+1;是因为特殊情况下:当num是9的倍数时,0+9的数字根和0的数字根不同. 性质说明 1.任何数加9的数字根还是它本身.(特殊情况num=0)        小学学加法的…

LeetCode--Maximum Depth of Binary Tree Question Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Answer /** * Definition for a binary tree…

104. 二叉树的最大深度 104. Maximum Depth of Binary Tree 题目描述 给定一个二叉树,找出其最大深度. 二叉树的深度为根节点到最远叶子节点的最长路径上的节点数. 说明: 叶子节点是指没有子节点的节点. LeetCode104. Maximum Depth of Binary Tree 示例: 给定二叉树 [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回它的最大深度 3. Java 实现 class TreeNode…

Minimum Depth of Binary Tree Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. 比较左子树和右子树的深度,取小的那个返回上来,并+1. 需要注意的是如果没有左子树或右子树.那么无条件取存在的那一边子树深…

Same Tree 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. Maximum Depth of Binary Tree Given a binary tree, find i…

Minimum Depth of Binary Tree Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. BFS碰到一个叶子结点就可以了. class Solution { public: int minDepth(TreeNo…

Maximum Depth of Binary Tree Total Accepted: 63668 Total Submissions: 141121 My Submissions Question Solution Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the…

104. Maximum Depth of Binary Tree -- Easy 方法 使用递归 /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: int…

Maximum Depth of Binary Tree  Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 与Minimum Depth of Binary Tree对照看 解法一:递归,子树高度+1. /** * Defini…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Have you met this question in a real interview? Yes Example Given a binary tree as follow:…

Minimum Depth of Binary Tree OJ: https://oj.leetcode.com/problems/minimum-depth-of-binary-tree/ Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf…

Maximum Depth of Binary Tree 本题收获 1.树时使用递归 2.注意边界条件时输出的值,仔细阅读题意,若是面试时,问清边界条件. 题目: Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 题目中说:最短路…

104. Maximum Depth of Binary Tree Easy Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: G…

104. Maximum Depth of Binary Tree Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 题目大意: 给一颗二叉树,求最大深度. 解题方法: 1.利用递归遍历二叉树. 注意事项: C++代码: /**…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 求二叉树的最大深度问题用到深度优先搜索DFS,递归的完美应用,跟求二叉树的最小深度问题原理相同.代码如下: C++ 解法一: class Solution { public: in…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

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 方法一:BFS 方法二:DFS 参考资料 日期 题目地址:https://leetcode.com/problems/maximum-depth-of-binary-tree/ Total Accepted: 85334 Total Submissions: 188240 Difficulty: Easy 题目描述 Given a binary tr…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 题解: 题意比较清楚, 找到从root出发最长的一条路径的长度. 采用DFS即可. 相似的一道题: Minimux Depth of Binary Tree 解法: http://…

主要用于记录在LeetCode刷题的过程中学习到的一些思想和自己的想法,希望通过leetcode提升自己的编程素养 :p 高效leetcode刷题小诀窍(这只是目前对我自己而言的小方法,之后会根据自己的切身经历更新): 算法不是纯粹拼智商的,智商高,就一定很厉害,不够聪明,就一定不行.算法是一种技能,是可以通过科学合理的方式训练出来的能力.目前国内大厂的算法考察,基本不会超过leetcode 中等难度,上限难度基本都是leetcode 中等题里面的中等难度 基本的算法数据结构是有限的.比如说链表…

Question Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Solution 1 -- Recursion Recursion way is easy to think. Similar with "Minimum Dep…

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 题解:递归,树的高度 = max(左子树高度,右子树高度)+1: 代码如下: /** * Definition for binary tree * public class Tre…