(二叉树 BFS DFS) leetcode 111. Minimum Depth of Binary Tree

【(二叉树 BFS DFS) leetcode 111. Minimum Depth of Binary Tree】的更多相关文章

(二叉树 BFS DFS) 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. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

(二叉树 BFS DFS) 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. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

[LeetCode] 111. 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. 给一个二叉树,找出它的最小深度.最小深度是从根节点向下到最近的叶节点的最短路径,就是最短路径的节点个数. 解法1:DFS 解法2: BFS Java: DFS, Time Comp…

[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 111 Minimum Depth of Binary Tree 二叉树

找出最短的从叶子到根的路径长可以回忆Maximum Depth of Binary Tree的写法,只不过在!root,我把它改成了10000000,还有max函数改成了min函数,最后的值如果是10000000,毫无疑问这棵树肯定为空,因此在最后有(d>=1000000)?0:d; /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *righ…

LeetCode 111. Minimum Depth of Binary Tree （二叉树最小的深度）

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. 题目标题:Tree 这道题目给了我们一个二叉树,让我们找到它最小的深度,注意这里的最小深度是指root 到一个 leaf node. 举个例子: 1 / 2 / 3 这种情况,…

leetcode 111 Minimum Depth of Binary Tree(DFS)

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. 题解:注意没有的分支不算. /** * Definition for a binary tree node. * struct TreeNode { * int val; * Tr…

leetcode 111 minimum depth of binary tree

problem description: 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. problem analysis: 第一步,设计演算法:遍历一棵树的方法有两种,BFS and DFS,思考了下,BFS是一圈一圈的扩张出…

leetcode 111 Minimum Depth of Binary Tree ----- java

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. 求树的最低高度. 没什么技巧性,用队列,遇到叶子结点的时候返回结果. /** * Definition for a binary tree node. * public cl…

Java [Leetcode 111]Minimum Depth of Binary Tree

题目描述: 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. 解题思路: 递归. 代码描述: /** * Definition for a binary tree node. * public class TreeNode { *…

Java for 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. 解题思路:注意minimum depth最后遍历的那个点,left right都必须为null,JAVA实现如下: public int minDepth(TreeNode roo…

Java实现LeetCode 111. Minimum Depth of Binary Tree

/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ class Solution { public int minDepth(TreeNode root) { if(root == null){ return 0; } if((root.left =…

【LeetCode】Minimum Depth of Binary Tree 二叉树的最小深度 java

[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. 递归和非递归,此提比较简单.广度优先遍历即可.关键之处就在于如何保持访问深度. 下面是4种代码: im…

LeetCode OJ Minimum Depth of Binary Tree 递归求解

题目URL:https://leetcode.com/problems/minimum-depth-of-binary-tree/ 111. Minimum Depth of Binary Tree My Submissions Question Total Accepted: 94580 Total Submissions: 312802 Difficulty: Easy Given a binary tree, find its minimum depth. The minimum…

【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][JAVA] Minimum Depth of Binary Tree && Balanced Binary Tree && Maximum 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. 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…

【easy】111. Minimum Depth of Binary Tree求二叉树的最小深度

求二叉树的最小深度: /** * 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 minDepth(TreeNode* root) { ; int l = m…

[LeetCode] 111. Minimum Depth of Binary Tree_Easy tag:DFS

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. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15,7…

【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…

【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]题解（python）：111 Minimum Depth of Binary Tree

题目来源 https://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 node. 题意分析 Input: a binary tree…

111. Minimum Depth of Binary Tree (Tree; DFS)

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. struct TreeNode { int val; TreeNode *left; TreeNode *right; TreeNode(int x) : val(x), left…

[Leetcode] The 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. 方法一: 层次遍历.主体的思想不变,程序的主体结构也不变,具体遍历过程参照二叉树的层次遍历.关键在于终止条件,在某一层中,节点遍历的顺序是从左往右的,若是最短路径出现在该层中,则其…

【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 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…

111 Minimum Depth of Binary Tree 二叉树的最小深度

给定一个二叉树,找出其最小深度.最小深度是从根节点到最近叶节点的最短路径的节点数量.详见:https://leetcode.com/problems/minimum-depth-of-binary-tree/description/ Java实现: 递归实现: /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * Tree…

【leetcode❤python】 111. Minimum 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): depthList=[] def minDepth(self, r…

[LeetCode 题解]: 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. 题意很清楚,找到二叉树中深度最短的一条路径,DFS(貌似是面试宝典上的一道题) 类似的一道题:http://www.cnblogs.com/double-win/p/3737262…

力扣算法题—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. Note: A leaf is a node with no children. Example: Given binary tree [3,9,20,null,null,15…

LeetCode(37)-Minimum Depth of Binary Tree

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 node. 思路: 题意是求一颗二叉树的的最短路径思路可以参考求二叉树的深度的算法,还是用递归的思想,考虑上级节点和下级左右子树的关系代码: /** * Definition fo…