摘要:
Rikka with Parenthesis II Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math ta 阅读全文
摘要:
Ball Description ZZX has a sequence of boxes numbered 1,2,...,n. Each box can contain at most one ball. You are given the initial configuration of the 阅读全文