传送门 这里是Ford-Fulkerson写的最大流模板 #include <iostream> #include <cstdio> #include <algorithm> #include <cstring> #include <string> #include <vector> #include <map> #include <set> #include <queue> #include &l…

http://acm.hdu.edu.cn/showproblem.php?pid=3549 Ford-Fulkerson算法. #include <iostream> #include <cstdio> #include <cmath> #include <vector> #include <cstring> #include <string> #include <algorithm> #include <stri…

解题关键:使用的挑战程序设计竞赛上的模板,第一道网络流题目,效率比较低,且用不习惯的vector来建图. 看到网上其他人说此题有重边,需要注意下,此问题只在邻接矩阵建图时会出问题,邻接表不会存在的,也体现了邻接表的优越性? edge结构体的第三个变量为from的下标. 模板一: #include<bits/stdc++.h> #define MAX_V 17 #define inf 0x3f3f3f3f using namespace std; typedef long long ll; in…

Flow Problem Time Limit: 5000/5000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 28193    Accepted Submission(s): 12476 Problem Description Network flow is a well-known difficult problem for ACMers. Given a graph,…

Drainage Ditches Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 14721    Accepted Submission(s): 6968 Problem Description Every time it rains on Farmer John's fields, a pond forms over Bessie's…

最小费用最大流,即MCMF(Minimum Cost Maximum Flow)问题 嗯~第一次写费用流题... 这道就是费用流的模板题,找不到更裸的题了 建图:每个m(Man)作为源点,每个H(House)作为汇点,各个源点与汇点分别连一条边,这条边的流量是1(因为每个源点只能走一条边到汇点),费用是 从源点走到汇点的步数,因为有多个源点与汇点,要建一个超级源点与超级汇点,超级源点与各个源点连一条流量为1,费用为0(要避免产生多余的费用)的边 按照这个图跑一发费用流即可 关于模板:前向星+SP…

因为坑了无数次队友 要开始学习网络流了,先从基础的开始,嗯~ 这道题是最大流的模板题,用来测试模板好啦~ Edmonds_Karp模板 with 前向星 时间复杂度o(V*E^2) #include<cstdio> #include<cstring> #include<cmath> #include<iostream> #include<queue> #define eps 0.000001 #define MAXN 20 #define MAX…

FFT模板题,求A*B. 用次FFT模板需要注意的是,N应为2的幂次,不然二进制平摊反转置换会出现死循环. 取出结果值时注意精度,要加上eps才能A. #include <cstdio> #include <cstring> #include <cmath> #include <algorithm> using namespace std; typedef long long ll; const double pi = acos(-1.0); const i…

1.HDU-3549   Flow Problem 2.链接:http://acm.hdu.edu.cn/showproblem.php?pid=3549 3.总结:模板题,参考了 http://www.cnblogs.com/Lyush/archive/2011/08/08/2130660.html  ,里面有几种模板,没太看懂 题意:给定有向图,求第1到第n个点的最大流. #include<iostream> #include<cstring> #include<cmat…

Meeting Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 3361    Accepted Submission(s): 1073 Problem Description Bessie and her friend Elsie decide to have a meeting. However, after Farmer Jo…