Hi everyone!

From Friday, February 16th to Monday, February 19th, we'll be hosting The Contest Contest 1. Participants will have a 3-hour window to solve 6 problems.

Note that this contest is rated for all participants.

More details can be found on the contest page.

We hope you enjoy the problems and have fun!

Hi everyone!

This thursday, we'll be hosting the first OTHS Coding Competition! The format of this contest will be the same as the CCC.

The contest will be unrated. For more details, check out the contest page.

Have fun!

Hi everyone!

Yet another time, this is yet another sentence in yet another message in yet another blog post with yet another announcement that there is yet another opportunity for yet another Yet Another Contest!

The contest will run from Friday, February 2nd to Thursday, February 8th. Participants will have a 3-hour window to complete 6 problems.

Note that the contest is not rated for users with at least 3000 rating.

Good luck and have fun!

Hi everyone!

This sunday, we're hosting our first Happy Hackers Programming Challenge!

The contest is rated for all users with a rating less than 2600.

For more details, please check out the contest page.

Good luck!

Hi everyone,

This weekend, we're hosting the first Mock CCC of the season!

The contests are unrated. You can read further details about them on the junior and senior pages.

UPDATE: The contests are now 1 week in length.

Have fun!

Hello!

This Sunday, we are hosting mirrors of the WOSS Dual Olympiad 2023!

There are three contests - junior, senior, and team. The contests are unrated. Please see the respective contest pages for more details.

Have fun!

The contest is now finished! Special congrats to the prize winners:

• For first place, Gennady.
• For first in UHS, RockyS
• First raffle winner, blueishfiend692
• Second raffle winner, exe_pc

Thanks for writing!

Hi everyone!

This friday, we will be hosting the first Unionville Algorithmic Coding Challenge, a contest hosted by Unionville High School!

The contest will be unrated, but there will be prizes, including a raffle prize! See the contest page for more details.

Good luck!

The contest is now finished! Special congrats to the top 5 contestants:

1. Gennady
2. kotatsugame
3. ksun48
4. maspy
5. ecnerwal

Hope to see everyone again soon!

Hi everyone! The DMOPC is finally back for the 2023-2024 school year, kicking off with a contest scheduled for the beginning of December!

The contest will run from Friday, December 1st to Monday, December 4th (inclusive of both days).

Anyone with a DMOJ account is welcome to participate, and anyone without one is welcome to register and participate.

Contestants may participate in any 3-hour window between 00:00:00 ET of December 1st and 00:00:00 ET of December 5th.

Please see the contest page for more details.

Best of luck to all participants!

Thanks for participating!

Congratulations to the top 5 contestants:

1. Gennady (prize winner)
2. lyrically
3. ecnerwal
4. jeroenopdebeek
5. bruce

Hi everyone!

This Friday, we'll be running a new rated contest called Singularity Cup.

There will be a $100 CAD cash prize for the first place competitor, which will be sent by e-transfer or PayPal.

The contest will run from Friday, November 3rd, to Monday, November 6th. There will be a 3-hour window to complete 6 problems.

The contest will be rated for all participants.

For more details, visit the contest page.

All problems from day 1 and day 2 of IOI have been added. You may access them here.

An unofficial mirror for day 1 and day 2 of the contest has been set up.

Finally, we wish to congratulate team Canada for their amazing performance at IOI!

• skittles1412 - IOI Gold,
• BalintR - IOI Silver,
• littlecat - IOI Silver,
• marsxiang5902 - IOI Bronze!