Codeforces Round #719 (Div. 3) E题- Arranging The Sheep
摘要：
传送门：Problem - E - Codeforces 官方题解： Let's denote by kk the number of sheep in the string, and by x1,x2,…,xkx1,x2,…,xk (1≤x1<x2<…<xk≤n1≤x1<x2<…<xk≤n) th 阅读全文
posted @ 2021-05-07 20:59 .yin 阅读(69) 评论(0) 推荐(0) 编辑