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leetcode第一刷_Maximum Depth of Binary Tree

这道题预计是ac率最高的一道了.你当然能够用层序遍历,我佩服你的耐心和勇气.由于看到别人的三行代码,会不会流眼泪呢.. class Solution { public: int maxDepth(TreeNode *root) { if(root == NULL) return 0; if(!root->left&&!root->right) return 1; return max(maxDepth(root->left), maxDepth(root->righ…

leetcode第一刷_Minimum Depth of Binary Tree

非常easy的题目.只是还是认为要说一下. 最小深度.非常快想到bfs,层序遍历嘛.本科的时候实在是没写过多少代码,一開始竟然想不到怎么保存一层的信息.后来想到能够压入一个特殊的对象,每次到达这个对象就知道是一层了.我用的是空指针.认为这个适用性还是不错的.一层的节点入队结束后,应该压入一个NULL.当一层的节点都处理完.遇到NULL的时候,要在队列尾部再入队一个NULL,这是后一层的分界线嘛. 昨天在还有一道题上看到了还有一种做法.用一个数据结构vector<set<*> >(2…

【一天一道LeetCode】#104. Maximum Depth of Binary Tree

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/maximum-depth-of-binary-tree/ Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along th…

【LeetCode练习题】Minimum Depth of Binary Tree

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. 和上一题对应,求二叉树的最小深度. 解题思路: 参考上一题Maximun Depth of Binary Tree中最后那…

【LeetCode练习题】Maximum Depth of Binary Tree

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…

LeetCode My Solution: Minimum Depth of Binary Tree

Minimum Depth of Binary Tree Total Accepted: 24760 Total Submissions: 83665My Submissions 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.…

【LeetCode】104. Maximum Depth of Binary Tree (2 solutions)

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…

【LeetCode】111. Minimum Depth of Binary Tree (2 solutions)

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. 与Maximum Depth of Binary Tree对照看 解法一:深度优先遍历 借助栈进行深度优先遍历(DFS),…

【LeetCode OJ】Minimum Depth of Binary Tree

Problem Link: http://oj.leetcode.com/problems/minimum-depth-of-binary-tree/ To find the minimum depth, we BFS from the root and record the depth. For each level we add 1 to the depth and return the depth value when we reach a leaf. The python code is…

【一天一道LeetCode】#111. Minimum Depth of Binary Tree

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 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 nod…

【LeetCode】111. Minimum Depth of Binary Tree 解题报告（Python）

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 DFS BFS 日期 [LeetCode] 题目地址:https://leetcode.com/problems/minimum-depth-of-binary-tree/ Total Accepted: 70767 Total Submissions: 243842 Difficulty: Easy 题目描述 Given a binary tree…

【LeetCode】104. Maximum Depth of Binary Tree 解题报告（Python）

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…

LeetCode之104. Maximum Depth of Binary Tree

-------------------------------- 递归遍历即可 AC代码: /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ public class Solution { public int maxDepth(TreeNode…

【LeetCode OJ】Maximum Depth of Binary Tree

Problem Link: https://oj.leetcode.com/problems/maximum-depth-of-binary-tree/ Simply BFS from root and count the number of levels. The code is as follows. # Definition for a binary tree node # class TreeNode: # def __init__(self, x): # self.val = x #…

【LeetCode】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. Solution: /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNo…

【LeetCode】111 - 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. Solution: 1.递归 /** * Definition for a binary tree node. * struct TreeNode { * int val; * T…

[LeetCode#104, 111]Maximum Depth of Binary Tree, Minimum Depth of Binary Tree

The problem 1: 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. My analysis: The recursion solution for this problem is very elegant!It inc…

LeetCode OJ 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. 很简单,直接上代码: /** * Definition for a binary tree node. * public class TreeNode { * int val; *…

LeetCode OJ 111. 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. 这个题目很简单,也是用递归来解决. /** * Definition for a binary tree node. * public class TreeNode { * int…

LeetCode OJ：Maximum Depth of Binary Tree（二叉树最大深度）

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. 求二叉树深度,直接看代码: /** * Definition for a binary tree node. * struct TreeNode { * int val; * Tr…

LeetCode OJ：Minimum Depth of Binary Tree（二叉树的最小深度）

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. 求二叉树的最小深度,额,简单的递归而已,代码如下: class Solution { public: int minDepth(TreeNode* root) { ; int le…

LeetCode：104 Maximum Depth of Binary Tree(easy)

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. 代码:…

【leetcode❤python】 Maximum Depth of Binary Tree

#-*- coding: UTF-8 -*- # Definition for a binary tree node.# class TreeNode(object):#     def __init__(self, x):#         self.val = x#         self.left = None#         self.right = Noneclass Solution(object):    def maxDepth(self, root):        if…

[leetcode]_Maximum Depth of Binary Tree

第三道树的题目,我还是不会,我擦,怎么递归算法还是不能很好理解.看来还得好好研究下递归算法. 题目:求一棵树的最大深度. 思路:递归地求取左子树最大深度 和 右子树最大深度,返回较大值即为 整棵树的 最大深度. 代码: public int maxDepth(TreeNode root) { if(root == null) return 0; int leftHeight = 1,rightHeight = 1; if(root.left != null) leftHeight += maxD…

LeetCode算法题-Minimum Depth of Binary Tree（Java实现）

这是悦乐书的第168次更新,第170篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第27题(顺位题号是111).给定二叉树,找到它的最小深度.最小深度是沿从根节点到最近的叶节点的最短路径上的节点数.叶子节点是没有子节点的节点.例如: 给定二叉树[3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回其最小深度= 2. 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,使用Java语言编…

LeetCode算法题-Maximum Depth of Binary Tree

这是悦乐书的第164次更新,第166篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第23题(顺位题号是104).给定二叉树,找到它的最大深度.最大深度是从根节点到最远叶节点的最长路径上的节点数.叶子是没有子节点的节点. 例如:给定二叉树[3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回其深度= 3. 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,使用Java语言编写和测试.…

[LeetCode] 111. Minimum Depth of Binary Tree ☆(二叉树的最小深度)

[Leetcode] Maximum and Minimum Depth of Binary Tree 二叉树的最小最大深度 (最小有3种解法) 描述 解析 递归深度优先搜索 当求最大深度时,我们只要在左右子树中取较大的就行了. 然而最小深度时,如果左右子树中有一个为空会返回0,这时我们是不能算做有效深度的. 所以分成了三种情况,左子树为空,右子树为空,左右子树都不为空.当然,如果左右子树都为空的话,就会返回1. 广度优先搜索(类似层序遍历的思想) 递归解法本质是深度优先搜索,但因为我们是求最小…

[LeetCode] Minimum Depth of Binary Tree 二叉树的最小深度

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. 二叉树的经典问题之最小深度问题就是就最短路径的节点个数,还是用深度优先搜索DFS来完成,万能的递归啊...请看代码: /** * Definition for binary tre…

LeetCode:Minimum Depth of Binary Tree,Maximum Depth of Binary Tree

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…

[LeetCode] Maximum Depth of Binary Tree 二叉树的最大深度

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…