Hi, I created a medium article (don't worry it's not starred article) to share about my thoughts on how to start CP for beginners: https://medium.com/@dickynovanto1103/competitive-programming-beginner-starter-pack-3564e717a890. Feel free to read it and also feel free to comment and give advices. Thanks

Hi Codeforces community, I have tried to figured out the solution of this problem: http://mirror.codeforces.com/gym/101775/problem/L . However, I can't get the way to solve this problem. Maybe anyone knows the approach to solve this problem?

I know that game theory type problem often require to compute the grundy number. But as far as I know, computing the grundy number is just the identifier whether the state is losing state (grundy number = 0) or winning state (grundy number != 0). However, this problem required to output condition where the result may be a draw and I don't know what is the grundy number representation for a draw.

Maybe do anyone know how to compute the grundy number if the solution is computing the grundy number?

Thanks anyway!! Good day to you..

I'd like to know some of your recommendation :)