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摘要： 题目链接 "Network of Schools" 题意 ：给你一个学校的单向连通图，1：问你至少选几个学校发放软件才能使全部学校都收到，2：问你至少添加几条边才能使全部的学校够成一个强连通分量 题解 ：求出强连通分量个数，然后找到强量通分量入度为0的个数res，这是第一个的答案（注意只有一个强连通 阅读全文

摘要： "题目链接" 题解：求强连通分量个数以及拓扑序，只有拓扑序的最后一个强连通分量有可能是解，然后判断一下最后一个强连通是否所有顶点可达就好了， // include include include include define pb push_back define ll long long defi 阅读全文

摘要： C. Kyoya and Colored Balls time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Kyoya Ootori 阅读全文

摘要： 题目链接：https://vjudge.net/contest/187496#problem/E E Excellent Engineers You are working for an agency that selects the best software engineers from Bel 阅读全文

摘要： E. Packmen time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output A game field is a strip of 1 × 阅读全文

摘要： 题目链接：http://codeforces.com/problemset/problem/847/I I. Noise Level time limit per test 5 seconds memory limit per test 256 megabytes input standard in 阅读全文

摘要： Problem F. Text Editor Input file: stdin Output file: stdout Time limit: 1 second Memory limit: 64 megabytes The simplest text editor “Open Word” allo 阅读全文

摘要： A. Arpa and a research in Mexican wave time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Ar 阅读全文

摘要： A. Kirill And The Game time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Kirill plays a ne 阅读全文

摘要： A. Diversity time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Calculate the minimum number 阅读全文