题意: 给出一个有向图,以及边上的容量上限,求最大流.(有重边,要将容量上限叠加) 思路: 用最简单的EK+BFS解决.每次搜到一条到达终点的路径,就立刻退出,更新ans,然后再回头修改图中的当前flow状况(这就得靠记录路径了).当当前图没有到达终点的路径图,流已经饱和,可以结束程序了. #include <bits/stdc++.h> #define LL long long #define pii pair<int,int> #define INF 0x7f7f7f7f us…

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 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   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: 2000/1000 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…

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 Ditches Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 8861    Accepted Submission(s): 4141 Problem Description Every time it rains on Farmer John's fields, a pond forms over Bessie's…

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…

题目描述 (传送门:http://poj.org/problem?id=1273翻译 by sxy(AFO的蒟蒻)) 每次约翰的农场下雨,Bessie的水池里的四叶草就会被弄破.这就意味着,这些四叶草又会被水淹没,并且会花费很长一段时间才能重新生长好.因此,约翰后来就架设了一套排水系统,这样一来Bessie的四叶草就不会因为下雨而被水淹没破坏了,雨水会通过排水渠流向附近的小溪.作为一个专业的工程师,约翰也在每一条排水渠的开头,安装了一个流量控制器,这样一来他就能控制让多少水流通过这条水渠. 约翰…

最大流的第一道题,刚开始学这玩意儿,感觉好难啊!哎····· 希望慢慢地能够理解一点吧! #include<stdio.h> #include<string.h> #include<queue> using namespace std; #define inf 1000000 #define min(a,b) a<b?a:b int map[210][210],pre[210],maxf[210]; int n,m; int bfs()//搜索,截止找不到增广路…