Minimum Cut[贪心]2015沈阳online 题意:割最少的边使得图不连通,并且割掉的边中有且仅有一条是生成树的边. 首先,我们选择一条树中的边进行切割,此时仅考虑树上的边集,有两种情况:1.树被分为两个结点数大于1的子树2.树被分为一个子树和一个单独结点. 如果选择第一种情况,那么还要割掉其中一颗子树中的结点所涉及到的所有非树中边,这种情况下,如果重新选择,选择子树上的一个叶子结点,那么只需要割掉叶子结点于该树所连的边和该结点涉及到的非树中边,所需要割的边数一定小于第一种情形. 代码…

题目链接: Hdu 5452 Minimum Cut 题目描述: 有一棵生成树,有n个点,给出m-n+1条边,截断一条生成树上的边后,再截断至少多少条边才能使图不连通, 问截断总边数? 解题思路: 因为只能在生成树上截断一条边(u, v),所以只需要统计以v为根节点的子生成树里的节点与子生成树外的节点的边数就可以了.对于新加入的边(u', v')来说,只影响以LCA(u, v)为根节点的子树里面的节点.统计所有答案,扫一遍输出最小即可.(比赛的时候只统计叶子节点,给水过去了........233…

Minimum Cut Time Limit: 3000/2000 MS (Java/Others)    Memory Limit: 65535/102400 K (Java/Others)Total Submission(s): 895    Accepted Submission(s): 387 Problem Description Given a simple unweighted graph G (an undirected graph containing no loops nor…

Minimum Cut Time Limit: 3000/2000 MS (Java/Others)    Memory Limit: 65535/102400 K (Java/Others)Total Submission(s): 769    Accepted Submission(s): 340 Problem Description Given a simple unweighted graph G (an undirected graph containing no loops nor…

Minimum Cut Time Limit: 10000MS   Memory Limit: 65536K Total Submissions: 9302   Accepted: 3902 Case Time Limit: 5000MS Description Given an undirected graph, in which two vertices can be connected by multiple edges, what is the size of the minimum c…

Minimum Cut Time Limit: 10000MS   Memory Limit: 65536K Total Submissions: 9319   Accepted: 3910 Case Time Limit: 5000MS Description Given an undirected graph, in which two vertices can be connected by multiple edges, what is the size of the minimum c…

Minimum Cut Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5452 Description Given a simple unweighted graph G (an undirected graph containing no loops nor multiple edges) with n nodes and m edges. Let T be a spa…

Description Given an undirected graph, in which two vertices can be connected by multiple edges, what is the size of the minimum cut of the graph? i.e. how many edges must be removed at least to disconnect the graph into two subgraphs? Input Input co…

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…