Codeforces Round #285 will be held at 12 January, 12.00 MSK. Problems are authored by me, Evgeny Savinov. This is my first round at Codeforces. I hope that this isn't the last one.
I want to thank sokian and Golovanov399 for help in preparing and testing round, Zlobober for invaluable help in preparing round, AlexFetisov for testing round, Delinur for translating problem statements in English, and of course, MikeMirzayanov for great systems Codeforces and Polygon.
By the way, today(11 January) is MikeMirzayanov's birthday. Happy birthday, Mike!
The round will be for both divisions. Information about score distribution will be posted just before the round starts.
UPD1: Scoring system will be dynamic. Problems will be arranged in ascending expected difficulty order.
UPD2: The editorial can be found here. I'm sorry for the delay.