One more codeforces format round takes place this evening. I'm the author of the contest problems. Artem Rakhov and Maria Belova helped me to prepare the problems. Great thanks to them and all codeforces "fighters"!
I wish you good luck and funny hacks!
P.S: This round won't be rated. So your ratings won't change. That's because of severe problems with codeforces server. Read here for explanation.