Description: 有F个牧场,1<=F<=5000,现在一个牧群经常需要从一个牧场迁移到另一个牧场.奶牛们已经厌烦老是走同一条路,所以有必要再新修几条路,这样它们从一个牧场迁移到另一个牧场时总是可以选择至少两条独立的路.现在F个牧场的任何两个牧场之间已经至少有一条路了,奶牛们需要至少有两条.给定现有的R条直接连接两个牧场的路,F-1<=R<=10000,计算至少需要新修多少条直接连接两个牧场的路,使得任何两个牧场之间至少有两条独立的路.两条独立的路是指没有公共边的路,但可以…

http://poj.org/problem?id=3177 (题目链接) 题意 给出一个n个节点m条边的无向图,求最少连几条边使图中没有桥. Solution 我们可以发现,用最少的边使得图中没有桥,那么就是将图缩点得到树,求使每个叶子节点相连所需要的最少边数,即 (叶子节点个数+1)/2 . Tarjan求出图中的桥,以及并查集记录下每个节点属于哪个双连通分量,只与一座桥相连的点即为叶子节点,统计答案即可. 听说会有重边,不过对我的程序好像并没有什么影响. 细节 这道题如果是求双联通分量然后…

http://poj.org/problem?id=3177 明显要求桥的一道题. (因为有桥就说明只能从那一条路走,换句话说就是只有一种方法) 求完桥后按照结论(加几条边成双连通图的结论,不会请baidu)就可以输出ans啦! (为此学了一下新的桥的求法……原来的那个常数太大了) #include<stack> #include<cstdio> #include<cstring> #include<iostream> #include<algorit…

在看了春晚小彩旗的E技能(旋转)后就一直在lol……额抽点时间撸一题吧…… Redundant Paths Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8159   Accepted: 3541 Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to anot…

Redundant Paths Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another field, Bessie and the rest of the herd are forced to cross near the Tree of Rotten Apples. The cows are now tired of…

Redundant Paths Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 19316   Accepted: 8003 题目链接:http://poj.org/problem?id=3177 Description: In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to anot…

1718: [Usaco2006 Jan] Redundant Paths 分离的路径 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 964  Solved: 503[Submit][Status][Discuss] Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another f…

题目链接:http://poj.org/problem?id=3177 Redundant Paths Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 15852   Accepted: 6649 Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to anoth…

Redundant Paths Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 13717   Accepted: 5824 Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another field, Bessie and the rest of the…

Redundant Paths Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 13712   Accepted: 5821 Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another field, Bessie and the rest of the…