As many of you already know, today is the day for Codeforces Round #127 missing which is really undesirable ;)
Original problems for you were created by tourist and Romka. We tried to emphasize the ideological component of the problems, thus we hope that you'll spend more time thinking than coding. Special thanks for helping in setting the contest go to Codeforces coordinator Gerald. We also thank Delinur for translating the problem statements and Alex_KPR for reviewing them.
We hope that this round won't be just a regular Codeforces round for you, but will bring you new experience and new knowledge. For the authors all problems are equally easy, yet we tried to arrange them in decreasing order of simplicity :)
Problems' point values in Division 1 are 1000-1000-1500-2000-2500. Problems' point values in Division 2 are 500-1000-2000-2000-2500.
Wish you success!
UPD: The contest is over, thanks all for participating. We hope you enjoyed it :)
In Division 1 rng_58 was a clear winner, solving all 5 problems in an hour and a half! No one else managed to solve all problems in two hours.
The winners in Division 1 are (full results):
In Division 2 every problem was solved by somebody, but nobody managed to solve all problems. The battle was very tough and the gaps were very small.
The winners in Division 2 are (full results):
Congratulations to the winners!
UPD2: The editorial is available now.