2018年9月6日
Gym - 101775A Chat Group 组合数+逆元+快速幂
摘要： It is said that a dormitory with 6 persons has 7 chat groups ^_^. But the number can be even larger: since every 3 or more persons could make a chat g 阅读全文
posted @ 2018-09-06 20:49 星辰大海。 阅读(571) 评论(1) 推荐(1) 编辑