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…

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…

\(\color{#0066ff}{ 题目描述 }\) 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…

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;…

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…

嘟嘟嘟 这应该是网络流入门题之一了,跟教辅的组成这道题很像. 把每一只牛看成书,然后对牛拆点,因为每一只牛只要一份,食物和饮料分别看成练习册和答案. #include<cstdio> #include<iostream> #include<cmath> #include<algorithm> #include<cstring> #include<cstdlib> #include<cctype> #include<v…

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<…

题意: (吃饭dining)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) (酒店之王)XX酒店的老板想成为酒店之王,本着这种希望,第一步要将酒店变得人性化.由于很多来住店的旅客有自己喜好的房间色调.阳光等,也有自己所爱的菜,但是该…