It contains code for Online judjes - Spoj and Codechef.
My SPOJ profile : http://www.spoj.com/users/nik1996/
My Codechef profile : https://www.codechef.com/users/nik1996
The link to problem statement is provided in the first line.
Look at the solution code only after you are unable to cop up with solution.
PS: Any bug if found may be reported.