I'd like to invite everyone to participate in a 5-hours Gym contest (both teams and individual participants can join) which will be held this Thursday, January 24th at 04:00 PM MSK (GMT+4), check for other time zones here: http://timeanddate.com/worldclock/fixedtime.html?day=24&month=1&year=2013&hour=16&min=0&sec=0&p1=166 (The registration will be opened 6 hours before the contest)
We will use the problems from the last ACM Arab Collegiate Programming Contest 2012 (English statements only), and the actual contest scoreboard will be merged into the Gym's scoreboard. Please don't participate if you already solved or read the problems. Hopefully the problems will be interesting for both Div1 and Div2 coders.
We encourage you to participate in teams to simulate the actual contest.
I'd like to mention that we used Polygon to prepare the problems for the actual contest, which is an amazing system and helped us a lot. Many thanks to Mike Mirzayanov and the whole team.
Edit 1: The registration is opened now, you can register here: http://codeforces.com/gyms
Thanks, Ahmed Aly