找了好久这两个的区别...UVA820 WA了 好多次.不过以后就做模板了,可以求任意两点之间的最大流. UVA 是无向图,因此可能有重边,POJ 1273是有向图,而且是单源点求最大流,因此改模板的时候注意一下. 而且我居然犯了更愚蠢的错误,以为重边的时候需要选最大的,正解应该是累加.... #include<stdio.h> #include<queue> #include<string.h> #define INF 999999 using namespace s…

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…

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:http://poj.org/problem?id=1273 a.EK算法:(Edmond-Karp): 用BFS不断找增广路径,当找不到增广路径时当前流量即为最大流. b.dinic算法:不断找最短路. 题意:现在有m个池塘(从1到m开始编号,1为源点,m为汇点),及n条水渠,给出这n条水渠所连接的池塘和所能流过的水量,求水渠中所能流过的水的最大容量. //http://blog.csdn.net/huzhengnan/article/details/7766446一个写的特别好的博…

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: 62708   Accepted: 24150 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means…

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…

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…

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…

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…