题意:给定一个有向带权图,使得每一个点都在一个环上,而且权之和最小. 分析:每个点在一个环上,入度 = 出度 = 1,拆点入点,出点,s到所有入点全部满载的最小费用MCMF; #include <bits/stdc++.h> using namespace std; *; const int INF = 0x3f3f3f3f; typedef pair<int,int> pii; struct Edge { int from, to, cap, flow, cost; }; str…

http://acm.hdu.edu.cn/showproblem.php?pid=1853 和下题一模一样,求一个图环的并,此题的题干说的非常之裸露 http://www.cnblogs.com/xiaohongmao/p/3873957.html #include <iostream> #include <cstdio> #include <cstring> #include <queue> using namespace std ; const int…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1853 Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others)Total Submission(s): 2289    Accepted Submission(s): 1162 Problem Description There are N cities in our…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1853 There are N cities in our country, and M one-way roads connecting them. Now Little Tom wants to make several cyclic tours, which satisfy that, each cycle contain at least two cities, and each city b…

Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others) Total Submission(s): 1120    Accepted Submission(s): 579 Problem Description There are N cities in our country, and M one-way roads connecting them. Now L…

链接:http://acm.hdu.edu.cn/showproblem.php?pid=1853 Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others) Total Submission(s): 1904    Accepted Submission(s): 951 Problem Description There are N cities in our c…

Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others)Total Submission(s): 1197    Accepted Submission(s): 626 Problem Description There are N cities in our country, and M one-way roads connecting them. Now Li…

Problem Description There are N cities in our country, and M one-way roads connecting them. Now Little Tom wants to make several cyclic tours, which satisfy that, each cycle contain at least two cities, and each city belongs to one cycle exactly. Tom…

Cyclic Tour Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/65535 K (Java/Others)Total Submission(s): 2257    Accepted Submission(s): 1148 Problem Description There are N cities in our country, and M one-way roads connecting them. Now L…

题意:两遍最长路,不能走重复点.和UVA 10806类似. 分析:拆点,u->u',MCMF,求的是最大流的最小费用,那么cost取负. 注意的是源点,源点不用拆,那么走出来的最小费用,左上角的点,右下角的点走了两遍,输出除去即可. #include <bits/stdc++.h> using namespace std; +; const int INF = 0x3f3f3f3f; struct Edge { int from, to, cap, flow, cost; }; stru…