链接: http://poj.org/problem?id=1273 Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 63763   Accepted: 24613 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This m…

链接: http://poj.org/problem?id=1273 代码: //Dinic #include<stdio.h> #include<string.h> #include<queue> #include<algorithm> using namespace std; ; ; struct Edge { int v, flow, next; }edge[MAXN]; int Head[MAXN], cnt; int Layer[MAXN]; vo…

题意:1是源点,m是汇点,求出来最大流量,没什么好说的就是练习最大流的模板题 ************************************************************** 先用Edmonds-Karp的算法做一下试试吧重边贡献了 1W,要加上所有的重边才算是两点间最大流量 *************************************************************************************************…

http://poj.org/problem?id=1459 嗯,网络流模板...多源点多汇点的图,超级汇点连发电厂,用户连接超级汇点 Status Accepted Time 391ms Memory 1588kB Length 2166 Lang G++ Submitted 2018-05-23 14:43:22 Shared RemoteRunId 18625420 #include <iostream> #include <string.h> #include <cm…

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…

Drainage Ditches Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 13064    Accepted Submission(s): 6196 Problem Description Every time it rains on Farmer John's fields, a pond forms over Bessie's…

#include<cstdio> #include<cstring> #include<algorithm> using namespace std; int n, m, S, T; ;//点数的最大值 ;//边数的最大值 const int INF = 0x3f3f3f3f; struct Edge { int to,next,cap,flow; } edge[MAXM]; //注意是MAXM int tol; int head[MAXN]; void init()…

http://poj.org/problem?id=1273 这道题很值得反思,弄了一下午,交上去先是一直编译错误,而在本地运行没有问题, 原因可能是oj的编译器版本老旧不支持这样的写法 G[from].push_back((edge){to,cap,G[to].size()}); G[to].push_back((edge){from,0,G[from].size() - 1}); 这两句交上去是不能通过的,不知道网上很多人这样子贴出代码是怎样通过的(‘白书’的模板有问题的) 如果是照着‘白书…

题目链接:poj.org/problem?id=1273 题目: 题意:求最大流. 思路:测板子题,分别用Dinic和EK实现(我的板子跑得时间均为0ms). Dinic代码实现如下: #include <set> #include <map> #include <queue> #include <stack> #include <cmath> #include <bitset> #include <cstdio> #in…

http://poj.org/problem?id=1273 Dinic算法 这是一道最大流的经典题 最大流尽量应该用边表,优于邻接矩阵(所以我写了邻接矩阵版的之后又写了个边表) 用了新学的Dinic算法 在每次找增广路之前先跑一遍bfs,把所有点的深度标记,按bfs记下的顺序找增广路,这条增广路上最小的边容量就是这条增广路的最大费用 跑出一条增广路之后,就开始更新现在的边剩余的容量,并建立反向边. #include<iostream> #include<cstdio> #incl…

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 long time to regrow. Thus, Farmer John has built a set of drainage…

Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 63339   Accepted: 24434 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…

POJ 1273给出M条边,N个点,求源点1到汇点N的最大流量. 本文主要就是附上dinic的模板,供以后参考. #include <iostream> #include <stdio.h> #include <algorithm> #include <queue> #include <string.h> /* POJ 1273 dinic算法模板 边是有向的,而且存在重边,且这里重边不是取MAX,而是累加和 */ using namespace…

题目链接:http://poj.org/problem?id=1273 Time Limit: 1000MS Memory Limit: 10000K 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…

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 long time to regrow. Thus, Farmer John has built a set of drainage…

链接 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 long time to regrow. Thus, Farmer John has built a set of draina…

Drainage Ditches 题目抽象:给你m条边u,v,c.   n个定点,源点1,汇点n.求最大流.  最好的入门题,各种算法都可以拿来练习 (1):  一般增广路算法  ford() #include <iostream> #include <cstdio> #include <cstring> #include <cmath> #include <algorithm> #include <string> #include…

网络流模板题. ========================================================================================================== #include<cstdio> #include<cstring> #include<iostream> #include<algorithm> #include<cmath> #include<queue>…

Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 74480   Accepted: 28953 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: 1000MS   Memory Limit: 10000K Total Submissions: 59176   Accepted: 22723 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…

http://poj.org/problem?id=1273 Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 62708   Accepted: 24150 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means…

Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 67823   Accepted: 26209 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: 1000MS   Memory Limit: 10000K Total Submissions: 67387   Accepted: 26035 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…

题目链接:poj1273 Drainage Ditches 呜呜,今天自学网络流,看了EK算法,学的晕晕的,留个简单模板题来作纪念... #include<cstdio> #include<vector> #include<queue> #include<cstring> #include<set> #include<algorithm> #define CLR(a,b) memset((a),(b),sizeof((a))) usi…

题目链接:http://poj.org/problem?id=1273 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 long time to regrow. Thus, Farmer John has…

http://poj.org/problem? id=1273 Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 55235   Accepted: 21104 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This mean…

点击打开链接 Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 49648   Accepted: 18829 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 cove…

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…

dinic版本 感觉dinic算法好帅,比Edmonds-Karp算法不知高到哪里去了 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 long time to regrow. Th…

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…