Link: https://www.spoj.com/problems/IITKWPCM/ How to solve this problem?

Does anyone know why lightoj is down? I can not access to the site. It will be helpful, if you let us know the reason.

Let's discuss the problems.

Problem Set

Problem link : https://toph.co/p/unbelievable-array How should I approach this problem? Someone help please.

Hey guys I am arranging an easy contest on Arenaboard. I think new comers should particpate on this contest. Here's the link: http://www.arenaboard.xyz/Countdown/A%20Mathematical%20Contest