Good evening!
I am glad to invite you to participate in Codeforces Beta Round #52 (Div. 2). Today's round was prepared Michael Mirzayanov, Max Ivanov and Maria Belov.
It's possible that "out of the competition"-participants will not be able to use the tab "hacks". Do not panic, on the next Div. 2 Round we will necessarily fix it.
Good luck!
Artem Rakhov and Codeforces team
I remember there was Chatting option on Codeforces. What happened to that? missing that.........
Today there were some issues with database performance (after migration to another server). It causes all inserts and/or updates to be very slow. It will be investigated. So today we had slow judging and some other inconveniences. Sorry for that. I know that "ratings" were not updated correctly, it will be fixed soon (I mean handle colors).
Anyway round itself passed without critical issues. Also the problems were clear and interesting. Thank you, RAD. Our congratulations refer to Petrozavodsk, to a PertSU university student zurg, who won this round! See you in Petrozavodsk!
Problem B of this contest has weak test case. Consider case: 8 1 7 3 7 4 5 6 2 8
My AC code outputs 2 7 though proper AC should print 0 0 because it can't be done with one inversion.