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Christmas Trees - Christmas Special Contest

posted on Dec. 25, 2014, 6:05 p.m. 4

Do you find yourself with nothing to do even on December 25?

Xyene and Kirito have prepared a contest for this day. The contest will last for 4 days, and there are 3 problems in total.

The theme is about trees. If you like trees or want to learn more about graph theory, you should check out this contest.

https://dmoj.ca/contest/christmastree

Cosmic Era Contest Delayed

posted on Dec. 25, 2014, 2:50 a.m. 0

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!

The Phantom of the Opera

posted on Dec. 22, 2014, 10:10 p.m. 0

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!

  • The Mirror
  • The Third Cellar
  • The Torture Chamber
  • And the ultimate challenge: Phantom's Python Challenge

STNBD Contest

posted on Dec. 22, 2014, 12:02 a.m. 0

Contest Link: https://dmoj.ca/contest/stnbd

It is an ongoing week-long contest. Check out the contest page for more details.

COCI '14 Contest 4 Added

posted on Dec. 20, 2014, 9:06 p.m. 0

All tasks from COCI '14 Contest 4 have been added to the judge.

DMOPC December Over

posted on Dec. 16, 2014, 11:57 p.m. 0

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.

DMOPC December Contest

posted on Dec. 14, 2014, 4:03 a.m. 0

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.

New Site Host

posted on Dec. 7, 2014, 1:40 a.m. 0

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.

GFSS Open Contest 1

posted on Dec. 3, 2014, 11:33 p.m. 0

Time: 8 December 2014, 3:30 PM EST

Glenforest SS introduces our first open contest!

Visit the contest links for more details!

Junior Contest Link

Senior Contest Link

COCI '14 Contest 3 Added

posted on Nov. 29, 2014, 10:08 p.m. 0

All tasks from COCI '14 Contest 3 have been added to the judge.

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Comment stream Discord

  • RomanBobylin → CCC '13 J1 - Next in line
  • epicssword1234 → CCC '09 S1 - Cool Numbers
  • Vidonicle → CCC '09 S1 - Cool Numbers
  • moekyalsin → ECOO '19 R1 P1 - Free Shirts
  • omarb2515 → COCI '19 Contest 3 #4 Lampice
  • zhangbyron97 → CCC '22 J3 - Harp Tuning
  • jerrycui07 → CCC '00 J1 - Calendar
  • epicssword1234 → ECOO '14 R2 P4 - What Lies Ahead
  • williamwong29 → CCC '19 J2 - Time to Decompress
  • williamwong29 → CCC '19 J2 - Time to Decompress
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New problems

  • IOI '23 P6 - Robot Contest
  • IOI '23 P5 - Overtaking
  • IOI '23 P4 - Beech Tree
  • IOI '23 P1 - Closing Time
  • IOI '23 P2 - Longest Trip
  • IOI '23 P3 - Soccer Stadium
  • Yet Another Contest 7 P1 - Page Turning
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