Hello!

As you may have noticed, this year's Central European Olympiad in Informatics (link) will take place from July 23rd to 29th, in Slovakia, and we'll hold mirror contests for each day here. We want to preserve the (subtasks, no hacks) format of the competition, so the mirrors will be unrated, but I still encourage you to find the time and participate.

I think the problems will be fairly well-balanced — not very hard for LGMs, but not too easy either, and everyone should be able to find subtasks on their own level.

The mirrors will start shortly after the official contest starts (that's how it's scheduled right now) or shortly after it ends.

The problems were prepared by majk, Monika Steinová, misof, Hodobox, Peter Perešíni and me.

Also, thanks to MikeMirzayanov for Codeforces and Polygon.