Round 1 will last 24 hours and start December 7, 2013 at 10:00 AM PT.

The top 500 people will advance to the Round 2. In addition, anyone that scores the same number of points as the person in 500th place will also advance to Round 2

The Qualification Round starts on November 21, 2013 at 4:00 PM PT and will last 72 hours.

What are the prizes?

• 1st Place: $10,000 USD
• 2nd Place: $2,000 USD
• 3rd Place: $1,000 USD
• 4th-25th Place: $100 USD

Who gets T-shirts?

The top 100 finishers from Round 2 will get t-shirts.

Registration
FAQ

Round 2 starts at 01:00 MSK

Top 100 will get t-shirts and will be advanced to round 3.

Link

Today, 20:10 MSK

Kostroma and I are problemsetters of Codeforces Round #120. It's first our contest and we hope you (and we too) will like it.

It's round for second division, but we think that everyone will find interesting problem for him.

Thanks for the help STAJIKER, HeroShadow, victor_kamashev, Abra, ifsmirnov, Aksenov239 and Gerald.
Thanks MikeMirzayanov for CodeForces platform and Delinur for English statements.

Good luck!

UPD: As usual, problems will cost 500-1000-1500-2000-2500 points.
UPD2: Problems are sorted according to expected difficulty.
UPD3: There was our mistake. The editorial was available for few minutes. If you see it, please not discuss problems and solutions. Now it is hided. In any case the round will be held. Decision, will contest rated or not will be made after contest. We are sorry for that.
UPD4: It's now known that only three participants from Div.2 have seen page with editorial while it was published (and 8 people in total). We'll not say any names, but we ask this people to not say anybody anything about the problem and to not use any post materials, if you have them. Thanks in advance.
UPD5: Please, don't panic. While your solution is in queue, you may solve other problems.
UPD6: Due to technical issues round is considered unrated. This problem and incident with editorial are strong enough reason for this decision. You may send your solutions to contest. They will be judged. We hope, that these technical problems will not spoil your impression about this round. Our sincere apologies. UPD7: Contest is over. Editorial is published. We hope, you like problems, prepared by us. We apologize again.
P.S: Excuse me, I don't know, when solution will be judged.

Today, 19:10 MSK

Registration is already started. Good luck!

It is last opportunity to advance to next stage.

Round starts at 20:00 MSK.
Registration is already opened.

Don't forget, there are only 2000 spots today.

It starts in 1 hour!
There is about 300 spots remaining

Today, 20:00 MSK

Registration is opened