New Year Couple

The new year 2017 is here. To celebrate the 31st night, Mr Rio has thrown a big party at his house. ...

Undo History

Robin is using a peculiar text editor to write a sequence of lines of text. The editor consists of t...

The Punishment of Hasinur

Hasinur studies at X School & College situated in Chittagong. AA Sir is one of the toughest and ...

MaxXOR

You are given an array A of n integers (A1, A2 , … , An) and some queries. In each query, you will b...