Hi everyone!

The fourth round of COCI will be held tomorrow, February 10th at 14:00 UTC. You can access the judging system here. If you are not familiar with COCI contest format, we encourage you to read the announcement.

The round was prepared by dorijanlendvaj, ToniB, Agnus, fbabic, mlicul, itiamhr and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you and good luck!