I am glad to announce that Codeforces Round #138 will be held today at 19:30 MSK. I (Vasiliy Vadimov) am the author of this round. It is my first Codeforces round, I just helped other authors to prepare their rounds before.
I would like to thank Gerald Gerald Agapov for his help in the preparing of the round and Maria Delinur Belova for translation of the problems' statements in English. Also I am grateful to Mike MikeMirzayanov Mirzayanov for such an excellent contest system as Codeforces.
Good luck! I hope you will be interested in the problems.
The point distribution is standard in both divisions (500-1000-1500-2000-2500).
UPD. Attention! D language will not be available on this contest.
UPD2. The round is over, top-5 in both divisions:
Congratulations to the winners!
Also I am apologising for mistakes in statement of problem div1 A/div2 C. The tutorial will be published tomorrow.
UPD3. The tutorial is available here.