We have tried our best to make the problem statements as clear and interesting as possible. We hope that everyone will enjoy the round. :)
Special thanks to MikeMirzayanov for creating the wonderful Polygon and Codeforces platforms, Gerald for his extensive help in problem verification and testing, and Delinur for translation of problem statements into Russian. Without their help the contest would never have seen the day.
We wish all the participants good luck and high rating. :)
UPD: It is decided to use the dynamic scoring system.
UPD: Contest is finished. You can find the editorial here. :)
UPD: Congratulations to the winners. Here are the top 8 (the only ones to solve all the problems):