Hi everyone!

I gave a contest in winter Petrozavodsk programming camp and now I'd like to share it with codeforces by making it a contest in codeforces gym: 2018-2019 Зимние Петрозаводские сборы, Oleksandr Kulkov Contest 1. It was my first experience giving a contest to the camp and I'm pretty much excited about it!

In the camp only 7 out of 11 problems were solved, so there should be something in the contest for everyone. To make the contest more interesting I suggest you to participate in it as live contest on Saturday, 9 March, 12:00 (UTC+3), which may be changed in case of overlap with some other contest or if it's inconvenient for many participants. After this I suggest to gather here and discuss problems (if anyone's going to participate, of course). I will also post editorial which may (or may not) contain some neat stuff.

Uhm, good luck and have fun :)

P.S. It appears you already may see problems if you have coach mode enabled, I'd ask you to not do this unless you're not going to participate in contest!

UPD: Gentle reminder that it's less than 24 hours before the contest and it's hopefully not going to be rescheduled this time.

UPD 2: Thanks everyone for participating in the contest! Here are editorials: link

UPD 3: Google drive link got broken, so I uploaded the editorial to the contest directly.