题目链接:http://poj.org/problem?id=1236 Network of Schools Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 19859   Accepted: 7822 Description A number of schools are connected to a computer network. Agreements have been developed among those…

Network of Schools Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 27121   Accepted: 10704 Description A number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a l…

Network of Schools A number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a list of schools to which it distributes software (the “receiving schools”). Note that if B is in t…

Description A number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a list of schools to which it distributes software (the "receiving schools"). Note that if B is in the…

Network of Schools Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 13801   Accepted: 5505 Description A number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a li…

A number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a list of schools to which it distributes software (the “receiving schools”). Note that if B is in the distribution lis…

题意: 求一个有向图中: (1)要选几个点才能把的点走遍 (2)要添加多少条边使得整个图强联通 分析: 对于问题1, 我们只要求出缩点后的图有多少个入度为0的scc就好, 因为有入度的scc可以从其他地方到达. 对于问题2, 每个入度为0的scc, 都可以补一条边可以变成强连通图, 每个出度为0的scc, 也可以补一条边使其变成强连通图. 所以答案就是max(入度为0scc个数,出度为0scc个数). #include<cstdio> #include<iostream> #inc…

Network of Schools Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 16571   Accepted: 6558 Description A number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a li…

nocow上的题解很好. http://www.nocow.cn/index.php/USACO/schlnet 如何求强连通分量呢?对于此题,可以直接先用floyd,然后再判断. ---------------------------------------------------------------------------------- #include<cstdio> #include<iostream> #include<algorithm> #includ…

题目: http://poj.org/problem?id=1236 [题意] N(2<N<100)各学校之间有单向的网络,每个学校得到一套软件后,可以通过单向网络向周边的学校传输,问题1:初始至少需要向多少个学校发放软件,使得网络内所有的学校最终都能得到软件.2,至少需要添加几条传输线路(边),使任意向一个学校发放软件后,经过若干次传送,网络内所有的学校最终都能得到软件. [题解] 找强连通分量,缩点.记f[i]为缩完点后的新图中各点入度,g[i]为出度,ans1为f[i]==0的点的数目,…