摘要：
例题：P2742 [USACO5.1]圈奶牛Fencing the Cows /【模板】二维凸包 https://www.luogu.com.cn/problem/P2742 之前一直没有学习过计算几何的知识，也没有遇到相关的题。但是最近发现这类型的题多了起来，于是决定学习一下计算几何的知识。 以这 阅读全文
摘要：
Vasya likes to travel by train, but doesn't like when the car he travels in is located in the tail of the train. Vasya gets on the train at the statio 阅读全文