题目链接:https://vjudge.net/problem/POJ-3189 Steady Cow Assignment Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6979   Accepted: 2418 Description Farmer John's N (1 <= N <= 1000) cows each reside in one of B (1 <= B <= 20) barns wh…

Steady Cow Assignment Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6817   Accepted: 2349 Description Farmer John's N (1 <= N <= 1000) cows each reside in one of B (1 <= B <= 20) barns which, of course, have limited capacity. So…

题目大概说,有n头牛和b块草地,每头牛心中分别对每块草地都有排名,草地在牛中排名越高牛安排在那的幸福度就越小(...),每块草地都能容纳一定数量的牛.现在要给这n头牛分配草地,牛中的幸福度最大与幸福度最小的差值越小越好,问最小能多小. 显然又是枚举结果跑最大流看是否合法.不过,枚举幸福度的差值是做不了的,应该要枚举的是幸福度的最大值和幸福度的最小值.然后建图没啥好说的..最后的结果要加1,因为题目说“including the endpoints”,虽然不知道什么意思.. #include<cs…

这两道题目都是多重二分匹配+枚举的做法,或者可以用网络流,实际上二分匹配也就实质是网络流,通过枚举区间,然后建立相应的图,判断该区间是否符合要求,并进一步缩小范围,直到求出解.不同之处在对是否满足条件的判断,可以求最大流或者最大匹配看匹配数目是否满足题意. POJ 2289: 多重二分匹配:360ms #include <iostream> #include <cstdio> #include <climits> #include <cstring> #in…

Steady Cow Assignment Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7482   Accepted: 2572 题目链接:http://poj.org/problem?id=3189 Description: Farmer John's N (1 <= N <= 1000) cows each reside in one of B (1 <= B <= 20) barns which,…

 Steady Cow Assignment Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 3189 Description Farmer John's N (1 <= N <= 1000) cows each reside in one of B (1 <= B <= 20) barns which, of co…

题目链接: Poj 3189 Steady Cow Assignment 题目描述: 有n头奶牛,m个棚,每个奶牛对每个棚都有一个喜爱程度.当然啦,棚子也是有脾气的,并不是奶牛想住进来就住进来,超出棚子的最大容量了,棚子是拒绝的.现在要给每个奶牛安家,本宝宝是一个公正无私的人类,所以要找一个奶牛喜爱程度差值最小的方案(虽然这样大家的喜爱程度可能普遍偏低,因为绝对公平并不代表合理啊),问喜爱程度的区间最小为多大? 解题思路: 每个棚子并不是住一个奶牛,所以是多重匹配咯.匹配的时候二分枚举喜爱程度的…

Farmer John's N (1 <= N <= 1000) cows each reside in one of B (1 <= B <= 20) barns which, of course, have limited capacity. Some cows really like their current barn, and some are not so happy. FJ would like to rearrange the cows such that the…

题目描述 Farmer John's N (1 <= N <= 1000) cows each reside in one of B (1 <= B <= 20) barns which, of course, have limited capacity. Some cows really like their current barn, and some are not so happy. FJ would like to rearrange the cows such that…

poj3189:http://poj.org/problem?id=3189 题意:这一题的题意.我看了很长时间才弄懂.就是给你n头牛,m个牛棚,每个牛对每一个牛棚会有一个满值,第i行第j个数表示的是第i头牛满意度为j的是牛棚mp[i][j],而且牛棚会有一定的容量.然后把牛分配到相应的牛棚,使得最大的满意度和最小的满意度之间的差值最小. 题解:由于,满意度的范围很小,所以就自然想到用枚举区间的办法,枚举满意度,但是如果没有优化的话,是会T的,我加了一个二分以及其他的优化,跑了300多点, #i…