AK_HuangYC的博客

Note that girls in Arpa’s land are really attractive. Arpa loves overnight parties. In the middle of one of these parties Mehrdad suddenly appeared. He saw n pairs of friends sitting around a table.

There is a kindom of obsession, so people in this kingdom do things very strictly. They name themselves in integer, and there are n people with their id continuous (s+1,s+2,⋯,s+n) standin