All problems were authored and prepared by 300iq and isaf27. Thanks to growup974, postscript, QAQAutoMaton, PM11, lior5654, morzer, qlf9, RedDreamer, gdb_18, talibmohd, Dragnoid99, KAN and VladGanzha for testing problems and good advice. Thanks to MikeMirzayanov for great systems Codeforces and Polygon.
You will be given 9 problems and 2 hours 30 minutes to solve them. Please, read all the problems. Good luck, have fun and we wish everyone high ratings!
The scoring distribution will be announced closer to the beginning of the round.