题目链接:https://vjudge.net/problem/UVA-315 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…

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:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=251 求割点,除了输入用strtok和sscanf处理输入以外,对于求割点的tarjan算法有了进一步理解. 特别注意88行,如果u是根并且至少两个儿子,那它一定是割点无误,还有第二个情况用如图代表: 这个例子里显然:low[4]=2,dfn[4]=4,dfn[3]=3.现dfs到…

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 思路分析:该问题要求求出无向联通图中的割点数目,使用Tarjan算法即可求出无向联通图中的所有的割点,算法复杂度为O(|V| + |E|): 代码如下: #include <cstdio> #include <vector> #include <cstring> #include <iostream> using namespace std; + ; + ; char str[MAX_…

Network Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 10907   Accepted: 5042 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…

割点的概念:对于无向图,删除这个点与其相连的边,整个图的连通分量个数增加. 对于无向图的tarjan算法,必须要设前驱~ 求割点的模板~ #include<cstdio> #include<algorithm> #include<vector> #include<stack> #include<cstring> using namespace std; ; vector<int> g[maxn]; int N,M,x,y; int l…

一.题目类型: 1.有向图的强连通分量: POJ1236 Network of Schools HDU1269 迷宫城堡 2.割点 & 割边: UESTC - 900 方老师炸弹 UVA315 Network UVA796 Critical Links HDU3394 Railway 3.无向图的边双联通分量: POJ3177 Redundant Paths HDU4612 Warm up HDU4738 Caocao's Bridges POJ3694 Network 4.无向图的点双联通分量…

Network 题目链接:https://vjudge.net/problem/UVA-315 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 li…

https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=5&page=show_problem&problem=251  Network  A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbe…