P3572 [POI2014]PTA-Little Bird 题目描述 In the Byteotian Line Forest there are nn trees in a row. On top of the first one, there is a little bird who would like to fly over to the top of the last tree. Being in fact very little, the bird might lack the s…
题目传送门 KRA 题目描述 For his birthday present little Johnny has received from his parents a new plaything which consists of a tube and a set of disks. The aforementioned tube is of unusual shape. Namely, it is made of a certain number of cylinders (of equa…