Graphs  Two ingredients 1. vertices (nodes) v 2. edges(undirected or directed) Examples: road networks, the web, social networks The minimum Cut problem Input: undirected graph G = (V, E)   (parallel edges allowed) Goal: compute a cut with fewest num…

题目大意 给一个无向图,包含 N 个点和 M 条边,问最少删掉多少条边使得图分为不连通的两个部分,图中有重边 数据范围:2<=N<=500, 0<=M<=N*(N-1)/2 做法分析 典型的无向图全局最小割,使用 Stoer-Wagner 算法 Stoer-Wagner 算法共执行 n-1 次 BFS,每次 BFS 得到一个当前图的最小 S-T 割,并且将最后 BFS 的两个点缩点,n-1 次 BFS 得到 n-1 个最小 S-T 割中的最小者就是整个无向图的全局最小割,为了讲述每…

出处:http://blog.csdn.net/euler1983/article/details/5959622 算法优化algorithmgraphtree任务 这篇文章说的是Yuri Boykov and Vladimir Kolmogorov在2004年提出的一种基于增广路径的求解最大流最小割的算法,号称大部分情况下会很快.而且在算完之后,会自动完成最小割集的构造. 作者写了一个C的实现:http://vision.csd.uwo.ca/code/maxflow-v3.01.zip 文章…

前提条件是这样的:输入一个图(可以是有向图,也可以是无向图,允许平行边存在),我们要做的事情是将这个图切割成两个子图,(切割的定义:将图中的所有顶点分为两个集合A和B,要求这两个集合非空)假设这个图中的顶点数为n,边的条数为m,这样一来就总共有2的n次方减2种切割方案,(每个顶点有两种选择,要么选集合A,要么选集合B,同时保证两个集合非空),要找到一种切割方案,使得切割经过的边最少(仅仅指从左边的集合A到右边的集合B的边,忽略有向图中从右边到左边的边) 这就引入了一种算法,叫Rand Contr…

Smallest Minimum Cut Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 1181    Accepted Submission(s): 473 Problem Description Consider a network G=(V,E) with source s and sink t. An s-t cut is a…

Problem Description Consider a network G=(V,E) with source s and sink t. An s-t cut is a partition of nodes set V into two parts such that s and t belong to different parts. The cut set is the subset of E with all edges connecting nodes in different…

Smallest Minimum Cut Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 2281    Accepted Submission(s): 913 Problem Description Consider a network G=(V,E) with source s and sink t. An s-t cut is a…

Consider a network G=(V,E) G=(V,E) with source s s and sink t t . An s-t cut is a partition of nodes set V V into two parts such that s s and t t belong to different parts. The cut set is the subset of E E with all edges connecting nodes in different…

Problem Description Consider a network G=(V,E) with source s and sink t . An s-t cut is a partition of nodes set V into two parts such that s and t belong to different parts. The cut set is the subset of E with all edges connecting nodes in different…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6214 Problem Description Consider a network G=(V,E) with source s and sink t. An s-t cut is a partition of nodes set V into two parts such that s and t belong to different parts. The cut set is the subse…