\(\color{#0066ff}{ 题目描述 }\) 有F种食物和D种饮料,每种食物或饮料只能供一头牛享用,且每头牛只享用一种食物和一种饮料.现在有n头牛,每头牛都有自己喜欢的食物种类列表和饮料种类列表,问最多能使几头牛同时享用到自己喜欢的食物和饮料.(1 <= f <= 100, 1 <= d <= 100, 1 <= n <= 100) $\color{#0066ff}{ 输入格式 } $ Line 1: Three space-separated integer…

题目描述 Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulous meals for his cows, but he forgot to check his menu against their preferences. Although he migh…

漂亮小姐姐点击就送:https://www.luogu.org/problemnew/show/P2891 题目描述 Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulous meals for his cows, but he forgot to chec…

裸的最大流. #include <cstdio> #include <cstring> #include <queue> const int MAXN = 4e3 + 19, MAXM = 4e6 + 19; struct Edge{ int to, next, c; }edge[MAXM]; int cnt = -1, head[MAXN]; inline void add(int from, int to, int c){ edge[++cnt].to = to;…

题目描述 Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulous meals for his cows, but he forgot to check his menu against their preferences. Although he migh…

P2891 [USACO07OPEN]吃饭Dining 题目描述 Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulous meals for his cows, but he forgot to check his menu against their p…

传送门:https://www.luogu.org/problemnew/show/P2891 题面 \ Solution 网络流 先引用一句真理:网络流最重要的就是建模 今天这道题让我深有体会 首先,观察数据范围,n=100,一般这种100-1000的图论题,很有可能是网络流. 那就直接从网络流的角度入手 考虑这样建模 建模要点如下: 1.建权值为1的边,保证每个食物和水仅用一次  2.没了 对以上的图求一个最大流,那不就是我们想要的最大的匹配数吗? 看起来是不是很OjbK? 其实不然,这样子…

题目链接:https://vjudge.net/problem/POJ-3281 Dining Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 20017   Accepted: 8901 Description Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume…

题目大意:有$n$头牛,$f$种食物和$d$种饮料,每种食物或饮料只能供一头牛享用,且每头牛只享用一种食物和一种饮料.每头牛都有自己喜欢的食物种类列表和饮料种类列表,问最多能使几头牛同时享用到自己喜欢的食物和饮料. 解题关键:设超级源点指向所有食物,饮料指向所有超级汇点,牛拆点为牛1和牛2,然后按照匹配进行建图,所有边权为1,保证每头牛不会贪吃,可知每条可行流为一个解,跑最大流即可. 一定注意坐标的范围分别代表什么,拆点的时候最容易出错的就是点坐标的表示. 牛拆点边权为1的原因是保证每头牛只能选…

题意 有F种食物和D种饮料,每种食物或饮料只能供一头牛享用,且每头牛只享用一种食物和一种饮料.现在有n头牛,每头牛都有自己喜欢的食物种类列表和饮料种类列表,问最多能使几头牛同时享用到自己喜欢的食物和饮料.(1 <= f <= 100, 1 <= d <= 100, 1 <= n <= 100) 题解 把每只牛拆点,源点向食物连,饮料向汇点连,然后牛拆出来的点之间连边容量1,保证一只牛只能吃一份食物和饮料,然后跑个最大流即可 //minamoto #include<…