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!

Hi everyone!

Yet another time, this is 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, August 11th to Thursday, August 17th. 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. This differs from the previous YAC.

Good luck and have fun!

And that marks the end of the last DMOPC of the school year! Special congrats to the top 5 contestants:

1. ksun48 (perfect score!)
2. Gennady (perfect score!)
3. hitonanode (perfect score!)
4. dnialh_
5. potato167

We hope you enjoy your summer, and we'll see you again next year!

Hmm, I wonder what the M stands for in DMOPC... Regardless of what it means, we're back with one final contest to wrap up the 2022-2023 school year!

The contest will run from Friday, June 16th to Monday, June 19th (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 EDT of June 16th and 00:00:00 EDT of June 20th.

Please see the contest page for more details.

頑張りましょう！

All problems from this year's CCO have been added. You may access them here.

Unofficial mirrors for day 1 and day 2 of the contest have also been set up.

Finally, congratulations to BalintR, skittles1412, marsxiang5902, and littlecat, who will be representing Canada at the IOI!

We hope you enjoyed the first DMOPC in a while! Special congrats to the top 5 contestants this time:

1. noimi (perfect score!)
2. kotatsugame
3. potato167
4. Rubikun
5. sansen

As always, see you soon™!

Oops! Looks like we clicked the snooze button one too many times... Anyways, we're finally back with another contest in the DMOPC series!

The contest will run from Friday, April 28th to Monday, May 1st (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 EDT of April 28th and 00:00:00 EDT of May 2nd.

Please see the contest page for more details.

Have fun!