We are glad to invite you to our first Codeforces Round Codeforces Round #551 (Div. 2) which will be held on Apr/13/2019 17:05 (Moscow time). This round will be rated for participants with rating less than 2100. We will be glad to see participants from the first division to join out of competition as well!
In this round, as the best friend of Serval's, you are going to help him to solve the problems he meets.
The problems are prepared by bzh and me. We hope you will enjoy the round. :P
Great thanks to 300iq for coordination of this round, isaf27, gritukan, KAN, mohammedehab2002, learner99, aleks5d and Um_nik for testing our rounds, and MikeMirzayanov for the amazing Codeforces and Polygon platforms.
You will be given 6 problems to solve in 2 hours. Scoring distribution will be announced later.
Please pay attention that there will be an interactive problem in this round, so learn more about interactive problems here before the contest.
Good luck & Have fun! :D
UPD: Scoring distribution is: 500-1000-1500-1750-2250-2750.
UPD2: Thank you for your participation in this round! Congratulations to the winners!
Div. 1 + Div. 2
UPD3: Sorry for the delay. The editorial is available.