There is an m by n grid with a ball. Given the start coordinate (i,j) of the ball, you can move the ball to adjacent cell or cross the grid boundary in four directions (up, down, left, right). However, you can at most move N times. Find out the numbe…

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"] 题目标签:Tree 这道题目给了我们一个二叉树,让我们记录所有的路径,返回一个array string list. 我们可以另外设一…

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 bottom-right corner of the grid (marked 'Finish' in t…

576. Out of Boundary Paths 给你一个棋盘,并放一个东西在一个起始位置,上.下.左.右移动,移动n次,一共有多少种可能移出这个棋盘 https://www.cnblogs.com/grandyang/p/6927921.html dp表示上一次移动,所有位置的路径数:t表示的是当前移动,所有位置的路径数.然后每次用t去更新dp,即当前次移动去更新上一次移动. 每次只要超过了边界,就记录可能的路径数更新最终的结果. class Solution { public: int…

原文转载自「刘悦的技术博客」https://v3u.cn/a_id_168 现在很多互联网企业学聪明了,知道应聘者有目的性的刷Leetcode原题,用来应付算法题面试,所以开始对这些题进行"魔改",比如北京某电商平台的这道题: 有一个正方形的岛,使用二维方形矩阵表示,岛上有一个醉汉,每一步可以往上下左右四个方向之一移动一格,如果超出矩阵范围他就死了,假设每一步的方向都是随机的(因为他是醉的),请计算n步以后他还活着的概率. 例如:输入矩阵大小2*2,起点(0,0),随机走出一步 n =…

576. 出界的路径数 给定一个 m × n 的网格和一个球.球的起始坐标为 (i,j) ,你可以将球移到相邻的单元格内,或者往上.下.左.右四个方向上移动使球穿过网格边界.但是,你最多可以移动 N 次.找出可以将球移出边界的路径数量.答案可能非常大,返回 结果 mod 109 + 7 的值. 示例 1: 输入: m = 2, n = 2, N = 2, i = 0, j = 0 输出: 6 解释: 示例 2: 输入: m = 1, n = 3, N = 3, i = 0, j = 1 输出:…

tarjan求边双连通分量, 然后就是一棵树了, 可以各种乱搞... ------------------------------------------------------------------------------- #include<cstdio> #include<cstring> #include<algorithm>   using namespace std;   const int maxn = 5009;   struct edge { int…

一天一道LeetCode (一)题目 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. For example, There is one ob…

[062-Unique Paths(唯一路径)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 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…

1718: [Usaco2006 Jan] Redundant Paths 分离的路径 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 964  Solved: 503[Submit][Status][Discuss] Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another f…