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…

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:http://poj.org/problem?id=1144 求割点.判断一个点是否是割点有两种判断情况: 如果u为割点,当且仅当满足下面的1条 1.如果u为树根,那么u必须有多于1棵子树 2.如果u不为树根,那么(u,v)为树枝边,当Low[v]>=DFN[u]时. 然后根据这两句来找割点就可以了. 模版题,就是题意看不懂.看了题解.这题算是废了,就当贴模版用吧. #include <iostream> #include <stdio.h> #include <…

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

poj2117 Electricity Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 3603   Accepted: 1213 Description Blackouts and Dark Nights (also known as ACM++) is a company that provides electricity. The company owns several power plants, each of…

题目:http://poj.org/problem?id=1523 题目解析: 注意题目输入输入,防止PE,题目就是求割点,并问割点将这个连通图分成了几个子图,算是模版题吧. #include <iostream> #include <stdio.h> #include <string.h> #include <algorithm> #include <stack> #include <string> #define N 10010…

Network Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 12707   Accepted: 5835 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…

传送门:Network 题意:给出一张无向图,求割点的个数. 分析:模板裸题,直接上模板. #include <cstdio> #include <cstring> #include <string> #include <cmath> #include <iostream> #include <algorithm> #include <queue> #include <cstdlib> #include <…

Network Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 17016   Accepted: 7635 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…

题目链接:https://vjudge.net/contest/67418#problem/B 题意:给一个无向连通图,求出割点的数量.首先输入一个N(多实例,0结束),下面有不超过N行的数,每行的第一个数字代表后面的都和它存在边,0表示行输入的结束. 题解:简单的求割点模版,所谓割点就是去掉这一个点还有于这个点链接的边之后使得原来的图连通块增加. 由于这是模版题代码会加上注释. #include <iostream> #include <cstring> using namesp…