题目链接:http://poj.org/problem?id=1679 有t组数据,给你n个点,m条边,求是否存在相同权值的最小生成树(次小生成树的权值大小等于最小生成树). 先求出最小生成树的大小,把最小生成树的边存起来.然后分别枚举最小生成树上的每条边,除了这条边,其他边是否能生成最小生成树,若生成树的权值等于原来最小生成树的权值,则不唯一,否则输出最小生成树的权值.这里我用kruskal比较方便. #include <iostream> #include <cstdio> #…

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…

The Unique MST 时间限制: 10 Sec  内存限制: 128 MB提交: 25  解决: 10[提交][状态][讨论版] 题目描述 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 tre…

The Unique MST Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 35999   Accepted: 13145 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undir…

次小生成树模板,别忘了判定不存在最小生成树的情况 #include <iostream> #include <cstdio> #include <cstring> using namespace std; + ; const int inf = 0x3f3f3f3f; int MAX[maxn][maxn], mp[maxn][maxn], dis[maxn], pre[maxn]; int t, n, m; bool vis[maxn], used[maxn][max…

The Unique MST Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 23942   Accepted: 8492 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undire…

The Unique MST Time Limit: 1000MS   Memory Limit: 10000K       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 t…

题目:poj 1679 The Unique MST 题意:给你一颗树,让你求最小生成树和次小生成树值是否相等. 分析:这个题目关键在于求解次小生成树. 方法是,依次枚举不在最小生成树上的边,然后加入到最小生成树上,然后把原树上加入了之后形成环的最长的边删去,知道一个最小的.就是次小生成树. 这些须要的都能够在求解最小生成树的时候处理出来. AC代码: #include <cstdio> #include <cstring> #include <iostream> #i…

The Unique MST Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 22668   Accepted: 8038 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undire…

题目链接:http://poj.org/problem?id=1679 The Unique MST Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 31378   Accepted: 11306 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spannin…