题意:      判断最小树是否唯一. 思路:      我用了两种方法,主要就是好久没敲了,找个水题练练手,第一种就是先一遍最小生成树,然后枚举最小生成树上的每一条边,然后取消这条边,在跑一遍最小生成树,就这样一直跑最小生成树,如果找到了一颗和之前的那个一样的,那么就是不唯一,第二种方法也是先最小树,然后枚举,在枚举的时候不是继续重新跑,而是断开当前边,把树分成两个集合<两次深搜实现>,然后在枚举这连个集合之间是否可以找到一个可以代替当前枚举的最小树的边,实现复杂度的话应该是第二种快点,但理…

题意:给出n个点,m条边,要你判断最小生成树是否唯一. 思路:先做一次最小生成树操作,标记选择了的边,然后枚举已经被标记了的边,判断剩下的边组成的最小生成树是否与前面的相等,相等,则不唯一,否则唯一...... #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; struct node { int v1,v2; int d…

<题目链接> 题目大意: 给定一张无向图,判断其最小生成树是否唯一. 解题分析: 对图中每条边,扫描其它边,如果存在相同权值的边,则标记该边:用kruskal求出MST. 如果MST中无标记的边,则该MST唯一:否则,在MST中依次去掉标记的边,再求MST,若求得MST权值和原来的MST 权值相同,则MST不唯一. #include <cstdio> #include <cstring> #include <algorithm> using namespac…

The Unique MST Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 27141   Accepted: 9712 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undire…

http://poj.org/problem?id=1679 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G, say…

PTA 7-4 最小生成树的唯一性 (35分) 给定一个带权无向图,如果是连通图,则至少存在一棵最小生成树,有时最小生成树并不唯一.本题就要求你计算最小生成树的总权重,并且判断其是否唯一. 输入格式: 首先第一行给出两个整数:无向图中顶点数 N(≤500)和边数 M.随后 M 行,每行给出一条边的两个端点和权重,格式为"顶点1 顶点2 权重",其中顶点从 1 到N 编号,权重为正整数.题目保证最小生成树的总权重不会超过 2^30 输出格式: 如果存在最小生成树,首先在第一行输出其总权重…

传送门:The Unique MST 题意:判断最小生成树是否唯一. 分析:先求出原图的最小生成树,然后枚举删掉最小生成树的边,重做kruskal,看新的值和原值是否一样,一样的话最小生成树不唯一. #include<iostream> #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<queue> #include<v…

题目链接: http://poj.org/problem?id=1679 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G…

题目链接 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G, say T = (V', E'), with the fol…

Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of G, say T = (V', E'), with the following properties…