[LeetCode]802. Find Eventual Safe States 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/find-eventual-safe-states/description/ 题目描述: In a directed graph, we start at some node and every turn, w…

原题链接在这里:https://leetcode.com/problems/find-eventual-safe-states/ 题目: In a directed graph, we start at some node and every turn, walk along a directed edge of the graph.  If we reach a node that is terminal (that is, it has no outgoing directed edges)…

In a directed graph, we start at some node and every turn, walk along a directed edge of the graph.  If we reach a node that is terminal (that is, it has no outgoing directed edges), we stop. Now, say our starting node is eventually safe if and only…

In a directed graph, we start at some node and every turn, walk along a directed edge of the graph.  If we reach a node that is terminal (that is, it has no outgoing directed edges), we stop. Now, say our starting node is eventually safe if and only…

题目如下: 解题思路:本题大多数人采用DFS的方法,这里我用的是另一种方法.我的思路是建立一次初始值为空的safe数组,然后遍历graph,找到graph[i]中所有元素都在safe中的元素,把i加入safe.遍历完graph后继续重头遍历,直到某一次遍历后无新元素加入safe后停止.safe即为题目要求的答案.以上面例子距离,首先safe是空,第一次遍历graph后,safe=[5,6];第二次遍历后将2和4加入safe:第三次遍历后无新元素加入,safe最终结果为[5,6,2,4] 代码如下…

https://leetcode.com/problems/find-eventual-safe-states/description/ class Solution { public: vector<bool> visited; vector<int> mem; // -1 unknown, 0 unsafe, 1 safe. int n; vector<int> eventualSafeNodes(vector<vector<int>>&am…

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 迭代 递归 日期 [LeetCode] 题目地址:https://leetcode.com/problems/reverse-linked-list/ Total Accepted: 105474 Total Submissions: 267077 Difficulty: Easy 题目描述 Reverse a singly linked list.…

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 递归 日期 题目地址:https://leetcode.com/problems/maximum-binary-tree/description/ 题目描述 Given an integer array with no duplicates. A maximum tree building on this array is defined as fol…

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 回溯法 循环 日期 题目地址:https://leetcode.com/problems/letter-case-permutation/description/ 题目描述 Given a string S, we can transform every letter individually to be lowercase or uppercase…

[LeetCode]760. Find Anagram Mappings 解题报告 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/find-anagram-mappings/description/ 题目描述: Given two lists Aand B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the order o…