Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 53640   Accepted: 20448 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by…

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…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1532 题目大意是:农夫约翰要把多个小池塘的水通过池塘间连接的水渠排出去,从池塘1到池塘M最多可以排多少的水流量,给定水渠和连接的两个小池塘,以及该水渠的流量,求最大流. 其实就是裸的最大流,源点是1号池塘,汇点是M号池塘,从1到M做一个dinic算法求出最大流就行,但是我一直WA,怎么也改不对,后来发现是因为自己喜欢用vector建边建图的原因,对于输入多组样例时,没有初始化上组样例的vector数…

最大流首次体验感受—— 什么是最大流呢? 从一个出发点(源点),走到一个目标点(汇点),途中可以经过若干条路,每条路有一个权值,表示这条路可以通过的最大流量. 最大流就是从源点到汇点,可以通过的最大流量. 接下来我们看一个图—— 图1 这个图中,s是源点,t是汇点.期间可以经过2, 3, 4, 5, 6几个点.每条边上有两个权值,其中第一个表示当前通过这条边的流量,第二个表示这条边最大可以通过的流量. 最佳情况,即最大可以通过的流量的一种情况是这样的—— 图2 但还有一种情况,同样可以达到最大流…

题目大意:就是由于下大雨的时候约翰的农场就会被雨水给淹没,无奈下约翰不得不修建水沟,而且是网络水沟,并且聪明的约翰还控制了水的流速, 本题就是让你求出最大流速,无疑要运用到求最大流了.题中m为水沟数,n为水沟的顶点,接下来Si,Ei,Ci分别是水沟的起点,终点以及其容量.求源点1到终点m的最大流速. EK算法详解参考链接 EK模板 #include<iostream> #include<queue> #include<cstring> #include<algor…

题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=1532 思路: 网络流最大流的入门题,直接套模板即可~ 注意坑点是:有重边!!读数据的时候要用“+=”替换“=”. 对网络流不熟悉的,给一篇讲解:http://www.cnblogs.com/ZJUT-jiangnan/p/3632525.html. ✧(≖ ◡ ≖✿)我是看这篇博客才入门的. 代码: #include <cstdio> #include <cstring> #inclu…

A - Drainage Ditches Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u   Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by wa…

Drainage DitchesHal Burch Time Limit 1000 ms Memory Limit 65536 kb description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a…

                                                                                        Drainage Ditches   Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water f…

Drainage Ditches Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 5   Accepted Submission(s) : 3 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description Every time it rains on…