P2899 [USACO08JAN]手机网络Cell Phone Network 题目描述 Farmer John has decided to give each of his cows a cell phone in hopes to encourage their social interaction. This, however, requires him to set up cell phone towers on his N (1 ≤ N ≤ 10,000) pastures (co…

题目描述 Farmer John has decided to give each of his cows a cell phone in hopes to encourage their social interaction. This, however, requires him to set up cell phone towers on his N (1 ≤ N ≤ 10,000) pastures (conveniently numbered 1..N) so they can all…

题目描述 Farmer John has decided to give each of his cows a cell phone in hopes to encourage their social interaction. This, however, requires him to set up cell phone towers on his N (1 ≤ N ≤ 10,000) pastures (conveniently numbered 1..N) so they can all…

P2899 [USACO08JAN]手机网络Cell Phone Networ题目描述 Farmer John has decided to give each of his cows a cell phone in hopes to encourage their social interaction. This, however, requires him to set up cell phone towers on his N (1 ≤ N ≤ 10,000) pastures (conv…

include include include include include include define db double using namespace std; const int N=1e5+10,M=2*N; int next[M],head[N],go[M],tot; inline void add(int u,int v){ next[++tot]=head[u];head[u]=tot;go[tot]=v; next[++tot]=head[v];head[v]=tot;go…

[USACO08JAN]手机网络Cell Phone Network 题目描述 Farmer John has decided to give each of his cows a cell phone in hopes to encourage their social interaction. This, however, requires him to set up cell phone towers on his N (1 ≤ N ≤ 10,000) pastures (convenie…

[洛谷P1262] 间谍网络 题目描述 由于外国间谍的大量渗入,国家安全正处于高度的危机之中.如果A间谍手中掌握着关于B间谍的犯罪证据,则称A可以揭发B.有些间谍收受贿赂,只要给他们一定数量的美元,他们就愿意交出手中掌握的全部情报.所以,如果我们能够收买一些间谍的话,我们就可能控制间谍网中的每一分子.因为一旦我们逮捕了一个间谍,他手中掌握的情报都将归我们所有,这样就有可能逮捕新的间谍,掌握新的情报. 我们的反间谍机关提供了一份资料,包括所有已知的受贿的间谍,以及他们愿意收受的具体数额.同时我们还…

P1948 [USACO08JAN]电话线Telephone Lines 题目描述 Farmer John wants to set up a telephone line at his farm. Unfortunately, the phone company is uncooperative, so he needs to pay for some of the cables required to connect his farm to the phone system. There a…

题库 : 洛谷 题号 : 1262 题目 : 间谍网络 link : https://www.luogu.org/problemnew/show/P1262 思路 : 这题可以用缩点的思想来做.先用Tarjan算法以一个没有被搜过&&能被收贿赂的点为起点,把每个强连通分量给缩成一个点(一个强连通分量 )(这个强连通分量里的任意一个可以收贿赂的间谍 收贿赂之后,就可以 掌握这个强连通分量中其他间谍的证据),然后我们在搜Tarjan 的时候记得把每个强连通分量中的最小收贿赂值算出来,这个对以后…

洛谷传送门 loj传送门 一道蛮基础的最小生成树的题 题意也没绕什么圈子 只是叙述的有点累赘而已(loj上是这样的 也就读入加建边需要稍稍稍多想一下下 对于我这么一个蒟蒻 这是一道很好的板子题 (洛谷和loj上有一点点小不同,主要按loj的题面) -------------------------------------------------------------------------------- (今日份懒得整题面qwq) -------------------------------…