题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3394 Railway Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2780    Accepted Submission(s): 953 Problem Description There are some locations in a…

传送门 点双练习. 对于一张图,询问有多少条边不属于任意一个点双和多少条边至少属于两个点双. 显然,一张图里有多少个桥就是第一问的答案. 对于第二问,考虑对于一个点双,如果其中的边数等于点数,那么这个点双就是一个简单环,如果边数大于点数,那么这个点双里的所有边都至少属于两个点双. 证明的话画个图看看就好啦QAQ //HDU 3394 //by Cydiater //2016.11.2 #include <iostream> #include <cstdlib> #include &…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3394 题目大意: 给定一个无向图,如果从一个点出发经过一些点和边能回到该点本身,那么一路走过来的这些点和边的集合就是一个环. 一个公园中有 n 个景点,景点之间通过无向的道路来连接,如果至少两个环公用一条路,路上的游客就会发生冲突:如果一条路不属于任何的环,这条路就没必要修. 问,有多少路不必修,有多少路会发生冲突? 解题思路: 每一个连通块中,如果边数大于点数,这个块中所有的边全部是冲突边. 所有…

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…

[题目描述] 有一个公园有n个景点,公园的管理员准备修建m条道路,并且安排一些形成回路的参观路线.如果一条道路被多条道路公用,那么这条路是冲突的:如果一条道路没在任何一个回路内,那么这条路是不冲突的 问分别有多少条有冲突的路和没有冲突的路 [题解] 这是一道点双联通的题,首先把图缩成块,显然如果块中边的数量大于点的数量,那么块中所有的边都是冲突的. 对于没有冲突的边,其实就是桥,tarjan的时候顺便求一下就行了. #include<iostream> #include<cstdio&g…

2080: [Poi2010]Railway Time Limit: 10 Sec  Memory Limit: 259 MBSubmit: 140  Solved: 35[Submit][Status][Discuss] Description 一个铁路包含两个侧线1和2,右边由A进入,左边由B出去(看下面的图片)    有n个车厢在通道A上,编号为1到n,它们被安排按照要求的顺序(a1,a2,a3,a4....an)进入侧线,进去还要出来,它们要按照编号顺序(1,2,3,4,5....n)从…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned…

Sorting Railway Cars time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are dist…

http://acm.hust.edu.cn/vjudge/contest/view.action?cid=102419#problem/E Description An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned in arbitrary order. David B…

C. Sorting Railway Cars   An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned in arbitrary order. David Blaine wants to sort the railway cars in the order of incr…