There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop rolling until hitting a wall. When the ball stops, it could choose the next direction. Given the ball's …

原题链接在这里:https://leetcode.com/problems/the-maze-ii/ 题目: There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop rolling until hitting a wall. When the ball stops…

There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop rolling until hitting a wall. When the ball stops, it could choose the next direction. Given the ball's …

There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop rolling until hitting a wall. When the ball stops, it could choose the next direction. Given the ball's …

原题链接:https://leetcode.com/articles/the-maze-ii/ 我的思路 在做完了第一道迷宫问题 http://www.cnblogs.com/optor/p/8533068.html 后,这第二道迷宫问题就比较简单了. 题意是求最短路径,所以我觉得使用深度优先搜索不合适(因为深度优先搜索需要遍历完所有走法之后再取路径最短的,比较麻烦),而广度优先搜索则较为适合这个问题.所以我尝试写了下广度优先搜索的实现: import java.util.LinkedList;…

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 BFS 日期 题目地址:https://leetcode-cn.com/problems/the-maze-ii/ 题目描述 There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, l…

A Dangerous Maze (II) LightOJ - 1395(概率dp) 这题是Light Oj 1027的加强版,1027那道是无记忆的. 题意: 有n扇门,每次你可以选择其中一扇.xi为负值的门带你abs(xi)后又回到原点.xi为正值 的门则带你离开迷宫,并且你会记住你前面选择的K道门,在下次选择的时候不会选择这些门.选择每扇门的概率相等.求走出迷宫的时间期望值. 题解: \(定义E[i] 表示记住了K道门后,显然这K道门都是为负值的门,走出迷宫的时间期望值,sum1表示为正的…

题目链接:https://vjudge.net/problem/LightOJ-1395 1395 - A Dangerous Maze (II)    PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB You are in a maze; seeing n doors in front of you in beginning. You can choose any door you like.…

787. The Maze https://www.cnblogs.com/grandyang/p/6381458.html 与number of island不一样,递归的函数返回值是bool,不是void. maze = -1用来表示已经访问的节点. dp用来记录每个位置的是否能访问,如果dp != -1,就表示这个地方已经访问过了,可以避免多余的访问. 一直滑动用while循环来做,这里并没有没移动一次就增加一个访问. int x = i,y = j必须这样写,因为之后的4种迭代都是从i.…

There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop rolling until hitting a wall. When the ball stops, it could choose the next direction. Given the ball's …