2020年12月20日
Codeforces Round #104 (Div.2)补题报告
摘要： B - Lucky Mask Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lu 阅读全文
posted @ 2020-12-20 22:02 nanmoon 阅读(111) 评论(0) 推荐(0) 编辑