Today we would like to invite you to take part in round #86. Round is prepared by Andrew Malevich (aka Kenny_HORROR) and me, Taras Brzezinsky. We are students of Belarusian State University. We would like to thank MikeMirzayanov , it4.kp , RAD , Gerald и Fefer_Ivan for helping and advice in preparing round and Delinur for translation.
While participating, you will get known with boy Peter and remember some of his school days to help him to solve some problems
The points for the problems in Div 1 & 2 will be: 500-1000-1500-2000-2500.
New service "Virtual contest" will be unavailable during the round due to possible instability.
Good luck to everyone!
The contest is finished, ratings are updated.
Congrats to winners:
Editorial is currently available, the whole problem set analysis will be added in few hours.