//////////在这幅图中我们首先要增广1->2->4->6,这时可以获得一个容量为2的流,但是如果不建立4->2反向弧的话,则无法进一步增广,最终答案为2,显然是不对的,然而如果建立了反向弧4->2,则第二次能进行1->3->4->2->5->6的增广,最大流为3. #include<stdio.h> #include<algorithm> #include<string.h> #include<q…

题目链接 Problem Description Network flow is a well-known difficult problem for ACMers. Given a graph, your task is to find out the maximum flow for the weighted directed graph. Input The first line of input contains an integer T, denoting the number of…

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…

  HDU 1565 方格取数(1) 给你一个n*n的格子的棋盘,每个格子里面有一个非负数.从中取出若干个数,使得任意的两个数所在的格子没有公共边,就是说所取的数所在的2个格子不能相邻,并且取出的数的和最大. Input 包括多个测试实例,每个测试实例包括一个整数n 和n*n个非负数(n<=20) Output 对于每个测试实例,输出可能取得的最大的和 Sample Input 3 75 15 21 75 15 28 34 70 5 Sample Output 188直接用这个程序拿双倍经验吧~…

Problem Description Almost everyone likes kebabs nowadays (Here a kebab means pieces of meat grilled on a long thin stick). Have you, however, considered about the hardship of a kebab roaster while enjoying the delicious food? Well, here's a chance f…

Problem Description Our geometry princess XMM has stoped her study in computational geometry to concentrate on her newly opened factory. Her factory has introduced M new machines in order to process the coming N tasks. For the i-th task, the factory…

HDU 3549 Flow Problem(最大流) Time Limit: 5000/5000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) [Description] [题目描述] Network flow is a well-known difficult problem for ACMers. Given a graph, your task is to find out the maximum flow for t…

HDU 3081 Marriage Match II (网络流,最大流,二分,并查集) Description Presumably, you all have known the question of stable marriage match. A girl will choose a boy; it is similar as the game of playing house we used to play when we are kids. What a happy time as…

网络流 HDU 3549 Flow Problem 题目:pid=3549">http://acm.hdu.edu.cn/showproblem.php?pid=3549 用增广路算法进行求解.注意的问题有两个: 1. 每次增广的时候,反向流量也要进行更行.一開始没注意,WA了几次 ORZ 2. 对于输入的数据,容量要进行累加更新. // 邻接矩阵存储 #include <bits/stdc++.h> using namespace std; const int INF = 0…

Flow Problem HDU - 3549 Network flow is a well-known difficult problem for ACMers. Given a graph, your task is to find out the maximum flow for the weighted directed graph.  InputThe first line of input contains an integer T, denoting the number of t…