poj 3264 http://poj.org/problem?id=3264 洛谷 P2880 https://www.luogu.org/problemnew/show/P2880 题目描述 For the daily milking, Farmer John's N cows (1 ≤ N ≤ 50,000) always line up in the same order. One day Farmer John decides to organize a game of Ultimat…