J. Drainage Ditches Time Limit: 1000ms Memory Limit: 32768KB 64-bit integer IO format: %I64d      Java class name: Main   Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is cov…

B. Uncle Tom's Inherited Land* Time Limit: 1000ms Memory Limit: 32768KB 64-bit integer IO format: %I64d      Java class name: Main Special Judge   Your old uncle Tom inherited a piece of land from his great-great-uncle. Originally, the property had b…

C. 方格取数(1) Time Limit: 5000ms Memory Limit: 32768KB 64-bit integer IO format: %I64d      Java class name: Main   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)   Ou…

Drainage Ditches Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 78671   Accepted: 30687 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…

hdu 1532 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N为水沟数,M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.注意重边 Dinic算法的实现有以下几个步骤: 1:初始化容量网络和网络流 2:构造残留网络和层次网络,若汇点不在层次网络中则算法结束 输出最大流 3:在层次网络中用一次DFS进行增…

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…

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: 69983   Accepted: 27151 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorit…

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 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…