摘要: Kate has a set SS of nn integers {1,…,n}{1,…,n}. She thinks that imperfection of a subset M⊆SM⊆S is equal to the maximum of gcd(a,b)gcd(a,b) over all 阅读全文
posted @ 2020-04-25 09:58 XXXSANS 阅读(183) 评论(0) 推荐(0)