目录 题目链接 注意点 解法 小结 题目链接 Rotting Oranges - LeetCode 注意点 解法 解法一:bfs.首先先统计所有新鲜的橘子数目fresh,如果fresh大于0则一直执行bfs.我们只处理昨天刚腐烂的橘子,grid[i][j]的值就表示第几天腐烂的橘子,由于新鲜橘子的值一开始就是2,所以每次修改的时候都要改为day+3即 day+1+2(2是本来就有的,1表示经过了一天).如果bfs之后发现新鲜橘子数没有减少则return -1,否则继续下一天的腐烂. class…

Leetcode之广度优先搜索(BFS)专题-994. 腐烂的橘子(Rotting Oranges) BFS入门详解:Leetcode之广度优先搜索(BFS)专题-429. N叉树的层序遍历(N-ary Tree Level Order Traversal) 在给定的网格中,每个单元格可以有以下三个值之一: 值 0 代表空单元格: 值 1 代表新鲜橘子: 值 2 代表腐烂的橘子. 每分钟,任何与腐烂的橘子(在 4 个正方向上)相邻的新鲜橘子都会腐烂. 返回直到单元格中没有新鲜橘子为止所必须经过的…

problem 994. Rotting Oranges 参考 1. Leetcode_easy_994. Rotting Oranges; 完…

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.com/problems/rotting-oranges/ 题目描述 n a given grid, each cell can have one of three values: the value 0 representing an empty cell; the value 1 repr…

题目如下: In a given grid, each cell can have one of three values: the value 0 representing an empty cell; the value 1 representing a fresh orange; the value 2 representing a rotten orange. Every minute, any fresh orange that is adjacent (4-directionally…

题目 You are given an m x n grid where each cell can have one of three values: 0 representing an empty cell, 1 representing a fresh orange, or 2 representing a rotten orange. Every minute, any fresh orange that is 4-directionally adjacent to a rotten o…

题目: 思路: 每个腐烂的橘子都能将自己上下左右的新鲜橘子传染,像极了现在的肺炎... 如果格子中只有一个腐烂的橘子,那么这便是一个典型的层次遍历,第一个传染多个,称为第二层,第二层传染第三层 但这里会出现初始时便有多个腐烂橘子的情况,其实道理是一样的,将第一层看成多个而不是一个,同样是层次遍历 这里利用双栈来实现层次遍历: 栈A存储第一批腐烂橘子,将第一批腐烂橘子传染的第二批腐烂橘子的位置全部存储至B,后将A清空,随后将B中第二批传染的第三批的位置存储至A,将B清空,直至AB均空 同时记录新鲜…

In a given grid, each cell can have one of three values: the value 0 representing an empty cell; the value 1 representing a fresh orange; the value 2 representing a rotten orange. Every minute, any fresh orange that is adjacent (4-directionally) to a…

You are given a m x n 2D grid initialized with these three possible values. -1 - A wall or an obstacle. 0 - A gate. INF - Infinity means an empty room. We use the value 231 - 1 = 2147483647 to represent INF as you may assume that the distance to a ga…

原题链接在这里:https://leetcode.com/problems/walls-and-gates/ 题目: You are given a m x n 2D grid initialized with these three possible values. -1 - A wall or an obstacle. 0 - A gate. INF - Infinity means an empty room. We use the value 231 - 1 = 2147483647 t…