The round is based on XIV Nizhny Novgorod Olympiad in Informatics named after V. D. Lelyukh for high school students, which will take place on Saturday in Nizhny Novgorod. However, the problems for the Olympiad and for the round are not completely identical.
The problems were prepared by KAP, I_Remember_Olya_ashmelev, ZhNV, kuzmichev_dima, demon1999, SYury, mmatrosov and me. Thanks to mike_live and vepifanov for testing the problems, and vintage_Vlad_Makeev and MikeMirzayanov for helping us to host the round on Codeforces!
As usual, participants from division 1 can take part out of competition.
Good luck and have fun!
UPD: There will be 6 problems with the following scores: 500-1000-1500-2000-2500-2750.
You will be able to view submissions and tests after the end of the olympiad in Nizhny Novgorod around 13:30 UTC.
Congratulations to winners!
The editorial is here.