Unfortunately, the author of the contest has decided to push the contest back to December 29. We are sorry for the inconvenience!
In its place, we offer a new contest about trees -- check the contest page for more details!
Oh no, the Phantom has kidnapped Christine Daaé and is about to force her into a marriage with him. Raoul, the vicomte de Chagny, is anxious to stop this, and make Christine marry him instead return freedom to Christine. The Persian, an old acquaintance of the Phantom, is also determined to stop the Phantom's terrorism of the Opera house, and to save Christine from a forced marriage, joins in with Raoul.
The Phantom hid Christine inside his house on the lake under the Opera house, well guarded. Can you help the duo break through all the defences to save Christine? We know that the Phantom, like any other crypto nerd, likes prime numbers...
The pressure is on. Solve these problems!
Contest Link: https://dmoj.ca/contest/stnbd
It is an ongoing week-long contest. Check out the contest page for more details.
All tasks from COCI '14 Contest 4 have been added to the judge.
Thanks to everyone who participated in the DMOPC December! The contest is now over.
If you have the time, please fill out an anonymous survey so we can make the next DMOPC even better.
If you have disagreements about judging verdicts, feel free to send them to us. We don't guarantee anything, but we will certainly read your appeal and consider it carefully.
On Tuesday, December 16 at 3:30 PM EST, we will be hosting the DMOPC 2014 December Contest. Anybody with a DMOJ account is welcome to participate, and anybody without one is welcome to register and participate.
We've migrated the DMOJ site to a new hosting provider, Linode. There should be noticeable (positive) differences in page load speed compared to before, and no more load time spikes. That being said, expect minor instabilities as we finish up migrating background services.
Time: 8 December 2014, 3:30 PM EST
Visit the contest links for more details!
All tasks from COCI '14 Contest 3 have been added to the judge.
The classics contest is over. If you want to try your hand at them again, you can find them on the problems page.