又是求次小生成树,就是求出最小生成树,然后枚举不在最小生成树上的每条边,求出包含着条边的最小生成树,然后取一个最小的 #include <iostream> #include <algorithm> #include <cstdio> #include <cstdlib> #include <cstring> #include <string> #include <stack> #include <queue>…

题意就是求最小生成树和次小生成树 #include<cstdio> #include<iostream> #include<algorithm> #include<cmath> #include<cstring> #include<string> #define cl(a,b) memset(a,b,sizeof(a)) #define debug(x) cerr<<#x<<"=="<…

题意: 求最小生成树和次小生成树的总权值. 思路: 第一种做法,适用于规模较小的时候,prim算法进行的时候维护在树中两点之间路径中边的最大值,复杂度O(n^2),枚举边O(m),总复杂度O(n^2): 第二种做法,倍增求lca,预处理复杂度O(nlog(n)),替换的时候log(n),总复杂度为O(mlog(n)). 代码: #include <stdio.h> #include <string.h> #include <algorithm> using namesp…

ACM Contest and Blackout 题目链接:https://vjudge.net/problem/UVA-10600 Description: In order to prepare the “The First National ACM School Contest” (in 20??) the major of the city decided to provide all the schools with a reliable source of power. (The m…

[题意] n个点,m条边,求最小生成树的值和次小生成树的值. InputThe Input starts with the number of test cases, T (1 < T < 15) on a line. Then T test cases follow. Thefirst line of every test case contains two numbers, which are separated by a space, N (3 < N < 100)the n…

题意:有T组数据,N个点,M条边,每条边有一定的花费.问最小生成树和次小生成树的权值. 解法:具体请见 关于生成树的拓展 {附[转]最小瓶颈路与次小生成树}(图论--生成树) 1 #include<cstdio> 2 #include<cstdlib> 3 #include<cstring> 4 #include<algorithm> 5 #include<iostream> 6 using namespace std; 7 8 const in…

题目链接:https://vjudge.net/problem/UVA-10600 In order to prepare the “The First National ACM School Contest” (in 20??) the major of the city decided to provide all the schools with a reliable source of power. (The major is really afraid of blackoutsJ).…

题目大意:给一张无向图,找出最小生成树和次小生成树. 题目分析:模板题...方法就是枚举所有的比最小生成树中两端点之间的最长边还要长的边,用它替换,再取一个最小的值便是次小生成树了. 代码如下: # include<iostream> # include<cstdio> # include<cstring> # include<cstring> using namespace std; # define REP(i,s,n) for(int i=s;i<…

用prim算法求最小生成树和次小生成树~ #include<cstdio> #include<algorithm> #include<cstring> using namespace std; ; const int inf=1e9; int g[maxn][maxn],d[maxn],visit[maxn],pre[maxn],c[maxn][maxn],N,M; int path[maxn][maxn];//记录最小生成树里两点之间的路径 void init ()…

The Best Seat in ACM Contest Time Limit: 1000MS Memory limit: 65536K 题目描述 Cainiao is a university student who loves ACM contest very much. It is a festival for him once when he attends ACM Asia Regional Contest because he always can find some famous…