题目是问,一个有向图有多少个点v满足∀w∈V:(v→w)⇒(w→v). 把图的强连通分量缩点,那么答案显然就是所有出度为0的点. 用Tarjan找强连通分量: #include<cstdio> #include<cstring> #include<algorithm> using namespace std; #define MAXN 5555 #define MAXM 5555*5555 struct Edge{ int u,v,next; }edge[MAXM];…

[POJ2553]The Bottom of a Graph Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 11182   Accepted: 4608 Description We will use the following (standard) definitions from graph theory. Let V be a nonempty and finite set, its elements being…

链接: https://vjudge.net/problem/POJ-2553 题意: We will use the following (standard) definitions from graph theory. Let V be a nonempty and finite set, its elements being called vertices (or nodes). Let E be a subset of the Cartesian product V×V, its ele…

The Bottom of a Graph Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 9139   Accepted: 3794 Description We will use the following (standard) definitions from graph theory. Let V be a nonempty and finite set, its elements being called ver…

题目地址:http://poj.org/problem?id=2553 The Bottom of a Graph Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 7881   Accepted: 3263 Description We will use the following (standard) definitions from graph theory. Let V be a nonempty and finit…

The Bottom of a Graph Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 9641   Accepted: 4008 Description We will use the following (standard) definitions from graph theory. Let V be a nonempty and finite set, its elements being called ver…

The Bottom of a Graph Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 11981   Accepted: 4931 Description We will use the following (standard) definitions from graph theory. Let V be a nonempty and finite set, its elements being called ve…

                                poj——The Bottom of a Graph Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 11044   Accepted: 4542 Description We will use the following (standard) definitions from graph theory. Let V be a nonempty and fin…

POJ 2553 The Bottom of a Graph 题目链接 题意:给定一个有向图,求出度为0的强连通分量 思路:缩点搞就可以 代码: #include <cstdio> #include <cstring> #include <algorithm> #include <vector> #include <stack> using namespace std; const int N = 5005; int n, m; vector&l…

The Bottom of a Graph Time Limit : 6000/3000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 1   Accepted Submission(s) : 1 Problem Description We will use the following (standard) definitions from graph theory. Let V…