摘要： 2019-07-18 09:15:34 这个是练习刷的题 Vus the Cossack and Numbers Vus the Cossack has nn real numbers aiai. It is known that the sum of all numbers is equal to 阅读全文

摘要： 2019-07-18 09:06:10 emmm.... 昨天5个小时做了一道题，心情复杂，不着急慢慢来 Ivan recently bought a detective book. The book is so interesting that each page of this book int 阅读全文