摘要：
There are n servers in a laboratory, each of them can perform tasks. Each server has a unique id — integer from 1 to n.It is known tha... 阅读全文
摘要：
KazaQ wears socks everyday.At the beginning, he has n pairs of socks numbered from 1 to n in his closets.Every morning, he puts on a p... 阅读全文