I'm glad to invite you to take part in Codeforces Round #720 (Div. 2), which will take place on May/07/2021 17:35 (Moscow time). The round will be rated for the participants with a rating lower than 2100. Participants from the first division are also welcomed to take part out of competition.
You will be given 2 hours 15 minutes to solve 5 problems. All the problems were created and prepared by me. One of the problems is interactive, please read the guide of interactive problems before the contest.
Huge thanks to those who helped make this round possible:
- Fliahin for being the first who gave feedback and helped with ideas on some problems.
- Denisov for providing priceless feedback during the entire creation of the round.
- KAN and Aleks5d for their excellent coordination.
- Valera_Grinenko, rkm62, PurpleCrayon, BOGDAN_, okwedook, namanbansal013, chctxdy68, ermakov22, Denisov, 4qqqq, alexX512, IaMaNanBord, perekopskiy, kassutta and never_giveup for testing and providing invaluable feedback.
- MikeMirzayanov for Codeforces and Polygon platforms.
I tried my best to create interesting problems and clear statements, so don't forget to read all ones :)
Hope you enjoy it!
UPD: Editorial is published!
UPD: Congratulations to the winners!