题意:求一个无向图的最小生成树,如果有多个最优解,输出"Not Unique!" 题解: 考虑kruskal碰到权值相同的边: 假设点3通过边(1,3)连入当前所维护的并查集s. 然后有一条边(下图蓝色的边)满足: 1.长度等于(1,3) 2.一端连到3,一端连入S. 那么该边可以替换掉(1,3).产生另一颗最小生成树. 关于如何判断该边一端连3,一端连入S, 用set来记录S中的点,find判断点是否在集合内.(发现kruskal可以用set写啊) #define _CRT_SEC…

链接: http://poj.org/problem?id=1679 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=82831#problem/K Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 24594   Accepted: 8751 Description Given a connected undirected graph, tell if its m…

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…

题目的意思已经说明了一切,次小生成树... ************************************************************************************ #include<algorithm> #include<stdio.h> #include<; ,}, pre[maxn];     , T = N-;     ; i<=N; i++)     {         pre[i] = ;         di…

求次小生成树思路: 先把最小生成树求出来  用一个Max[i][j] 数组把  i点到j 点的道路中 权值最大的那个记录下来 used数组记录该条边有没有被最小生成树使用过   把没有使用过的一条边加入最小生成树必然回形成一条回路   在这条回路中减去 除加入的边的权值最大的一条边  原图必然保持连通  (如果此时 权值最大的边和新加入的边权值相同  则存在 不同的最小生成树) 把每一条边加入再删除后 即可得出次小生成树 参考了: https://blog.csdn.net/qq_3395144…

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…

http://poj.org/problem?id=1679 The Unique MST Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 17726   Accepted: 6150 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree…

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…

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…

题意: 思路: 搜+判重 嗯搞定 (听说有好多人用7个for写得-.) //By SiriusRen #include <bitset> #include <cstdio>0 using namespace std; bitset<134217728>bit; char s[17][17],vis[17][17],xx[]={1,-1,0,0},yy[]={0,0,1,-1}; int ans; bool check(int x,int y){ for(int i=0;…