题意: 一个n*m的棋盘,每次行动只能向下或者向右走1格,求从左上角走到右下角有几种不同的方案数。 思路: 因为行动只能向下向右,所以总步数是一定的,即n - m + 2步。那么问题就变成了这里面的哪几步是向下的,就是组合数了,即从n - m + 2个中选n - 1个的组合数。 题目里说的n和m值太夸张了,因为他的函数返回int……所以肯定很小。 代码: class S
Redundant Paths Time Limit: 3000/1000MS (Java/Others) Memory Limit: 65535/65535KB (Java/Others) Submit Status In order to get from one of the F(1≤F≤5,000) grazing fields (which a
* Binary Tree Paths* 描述 Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2 3 \ 5 All root-to-leaf paths are: [“1->2->5”, “1->3”] 我的代码
问题分析: Given a binary tree, return all root-to-leaf paths. 示例: given the following binary tree: 1/ \2 3\5 All root-to-leaf paths are: ["1->2->5", "1->3"] 问题分析: 这里涉及到将整数转换为字符串的问题,还好新
Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1/ \2 3\ 5 All root-to-leaf paths are: [“1->2->5”, “1->3”] 解题思路 先序遍历,递归的过程中保存路径,遇
今天在安装yapi的时候,找到的网上教程需要安装mongodb,安装好镜像之后执行了docker run -d --name mongo-yapi -v mongo_data_yapi:/data/db mongo这个命令来启动的时候,出现了 Error response from daemon: cannot bind mount volume: mongo_data_yapi volume p
我每次启动VSCODE时,总提示如下内容 问题 The environment variable ‘Path’ seems to have some paths containing the ‘"’ character. The existence of such a character is known to have caused the Python extension to not l
题目描述 Follow up for "Unique Paths":Now consider if some obstacles are added to the grids. How many unique paths would there be?An obstacle and empty space is marked as 1 and 0 respectively in the grid
题目 A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).The robot can only move either down or right at any point in time. The robot is trying to reach the
问题链接:https://leetcode.com/problems/unique-paths-iii/ 这个问题与Unique Paths和Unique Paths II都属于同一类问题,但有所不同。它要求从指定起点出发经过每一个可通行的格点,然后到达指定终点的路径总数。 开始想到的就是暴力搜索的方式,代码的基本结构与它的姊妹题基本一致,但是返回条件和参数却不一样,代码如下: class S