描述 A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbered by integers from 1 to N. No two places have the same number. The lines are bidirectional and always connect together two plac…

描述 Consider the two networks shown below. Assuming that data moves around these networks only between directly connected nodes on a peer-to-peer basis, a failure of a single node, 3, in the network on the left would prevent some of the still availabl…

题目大意:有向图求割点 题目思路: 一个点u为割点时当且仅当满足两个两个条件之一: 1.该点为根节点且至少有两个子节点 2.u不为树根,且满足存在(u,v)为树枝边(或称 父子边,即u为v在搜索树中的父亲),使得 dfn(u)<=low(v). 然后注意读入,很容易RE #include<stdio.h> #include<string.h> #include<stdlib.h> #include<math.h> #include<vector&…

题目链接:http://poj.org/problem?id=1144 题目大意:给以一个无向图,求割点数量. 这道题目的输入和我们一般见到的不太一样. 它首先输入 \(N\)(\(\lt 100\))表示点的数量(\(N=0\)表示文件输入结束). 然后接下来每行输入一组数字. 如果这一组数字只包含一个 \(0\) ,说明本组测试数据输入结束: 否则,假设这些数可以拆分成 \(a_1,a_2,a_3, \cdots ,a_m\),则说明 \(a_1\) 这个点到 \(a_2,a_3, \cdo…

描述 Blackouts and Dark Nights (also known as ACM++) is a company that provides electricity. The company owns several power plants, each of them supplying a small area that surrounds it. This organization brings a lot of problems - it often happens tha…

本题大意:求一个无向图额割点的个数. 本题思路:建图之后打一遍模板. /************************************************************************* > File Name: uva-315.network.cpp > Author: CruelKing > Mail: 2016586625@qq.com > Created Time: 2019年09月06日 星期五 17时15分07秒 本题思路:就是求图中有多…

题目链接:http://poj.org/problem?id=1144 描述 一个电话线公司(简称TLC)正在建立一个新的电话线缆网络.他们连接了若干个地点分别从1到N编号.没有两个地点有相同的号码.这些线是双向的并且能使两个地点保持通讯.每个地点的线都终结于电话交换机.每个地点都有一个电话交换机.从每个地点都能通过线缆到达其他任意的地点,然而它并不需要直接连接,它可以通过若干个交换机来到达目的地.有时候某个地点供电出问题时,交换机就会停止工作.TLC的工作人员意识到,除非这个地点是不可达的,否…

Description A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbered by integers from 1 to N . No two places have the same number. The lines are bidirectional and always connect togethe…

Description A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbered by integers from 1 to N . No two places have the same number. The lines are bidirectional and always connect togethe…

题目大意:求以无向图割点. 定义:在一个连通图中,如果把点v去掉,该连通图便分成了几个部分,则v是该连通图的割点. 求法:如果v是割点,如果u不是根节点,则u后接的边中存在割边(u,v),或者v->Low所对应的节点就是u(即u->DfsN <= v->Low),图所分成的部分为v的子树与其它:如果u是根节点,则如果搜索树中与u相连的边数大于等于2,图被分成的部分为各个与根相连的子树. 特判: 求割边时需要考虑通往父亲的边,但是求割点就算有再多的重边也不会有影响. 所以只需特判根节…