Welcome all to Codeforces Round #131, which will be held on Monday, 30th of July at 19:30 MSK. I am (Sergey Nagin) an author of the problems. This will be my First Codeforces round and I hope it won't be the last one :).
I would like to thank Mike Mirzayanov(MikeMirzayanov) who made this contest possible, Roman Furko(Furko) and Gerald Agapov(Gerald) for helping to prepare this round and Maria Belova(Delinur) for the translation of problem statements into English. I hope that problems will be interesting for you.
Problems’ point values in Division 1 are 1000-1000-1500-2000-2500. Problems’ point values in Division 2 are 500-1000-2000-2000-2500.
I strongly recommend you to read ALL the problems.
The contest is over! Congratulations' to winners!
I hope, that problems were interesting for you.
You can view tutorial.
Some personal information. This year I finished school and I will go to university. I study programming during almost five years. In addition to computer science, I like sports: powerlifting, arm wrestling and swimming.