We are glad to introduce you regular Codeforces round #123 for Div.2 participants. Everyone can traditionally participate in it.
Problems are prepared by command of authors: Ivan Fefer (Fefer_Ivan), Igor Kudryashov (KudryashovIA), Pavel Kholkin (HolkinPV) and Gerald Agapov (Gerald). Also thanks to Pavel Kunyavskiy (kuniavski) and Alexander Kouprin (Alex_KPR) for their help. And traditionally thanks to Michael Mirzayanov (MikeMirzayanov) for Codeforces system and Mary Belova (Delinur) for translating problems.
Score distribution is standard: 500, 1000, 1500, 2000, 2500.
We wish you success and high rating!
Congratulations to winners:
UPD: the tutorial is here