4780: [Usaco2017 Open]Modern Art 2 Time Limit: 10 Sec Memory Limit: 128 MB Description Having become bored with standard 2-dimensional artwork (and also frustrated at others copying her w ork), the great bovine artist Picowso has decided to switch t…
http://www.lydsy.com/JudgeOnline/problem.php?id=3887|| https://www.luogu.org/problem/show?pid=3119 Description In an effort to better manage the grazing patterns of his cows, Farmer John has installed one-way cow paths all over his farm. The farm con…
题目描述 Farmer John is continuing to ponder the issue of cows crossing the road through his farm, introduced in the preceding two problems. He realizes now that the threshold for friendliness is a bit more subtle than he previously considered -- breeds …