TarikHassan

Professor invites his n friends on his birthday. He wants to reward all of them and make them happy....

Maybe you all are familiar with Jenga Game. "Jenga is played with 54 wooden blocks. Each block is th...

Akib is a very good student but his reading table is very messy. One Friday afternoon, Akib is sitti...

An array of integers p1​,p2​,....,pn​ is called a permutation if it contains each number from 1 to n...