The DMOJ is a modern contest platform and archive of programming problems. It's also entirely open source.
So far, 146826 developers have submitted to 4656 problems a total of 5441624 times, using 68 languages.
If this is your first visit, please register an account. Then, try the Hello, World! problem.
Hello everyone!
We are excited to announce a Mock CCC Junior contest for 2023!
The contest will run from Saturday, February 11th to Tuesday, February 14th (inclusive of both days).
UPDATE: Due to issues with the problem statements, the contest was moved to start on Saturday, and is no longer rated.
Please see the contest page for more details.
Good luck!
Dark mode for DMOJ has been one of the most requested features for a long time — today, we are finally ready to announce an experimental dark mode.
To activate it, head to your profile edit page and select "Enable experimental features". By default, DMOJ will follow your system theme, but you can override this by explicitly selecting either the light or dark theme.
If you discover any styling issues that haven't already been reported, please add a comment to the GitHub issue tracking dark mode.
Special thanks to for spearheading this effort!
Hello fellow programmers!
Cheerio is back just in time for the CCC!
The contest will run from February 3rd to February 7th (inclusive). Participants will have a 3 hour window to solve 5 problems.
The contest will be rated for users with a rating of under 2200.
More details can be found on the contest page.
We hope to see you soon!
Richmond Hill High School CS Club
DMOJ contest organizers typically send out reminder emails prior to contests. Unfortunately, the checkbox asking for registration at sign-up has been silently broken for the past three years, so if you've created your account in that time, you may not be aware of this functionality (it's fixed now!)
If you're interested in receiving contest update emails, you can sign up for them in your profile page.
Happy new year!! We hope you learned something new from this contest to kickstart your new year! Special congrats to the top 5 contestants:
As promised, wins one month of Discord Nitro, while and each win one month of Discord Nitro Basic! All winners will be sent an email in the coming days, and must reply within 3 days to claim their prize.
As always, see you soon!
Happy holidays!! To ensure that you have a joyful and exciting new year, we are excited to announce that the third DMOPC of the 2022-2023 school year will be held this coming weekend!
The contest will run from Friday, December 30th to Monday, January 2nd (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 EST of December 30th and 00:00:00 EST of January 3rd.
Please see the contest page for more details.
Good luck!
Thanks for participating!
The top 5 contestants from the contest that win prizes are
The raffle winner is !
See this video for the authenticity of randomness.
We hope to see you again soon!
Hi, everyone (for the first time)!
On Friday, December 30th, 2022, we'll be running the first Max's Anger Contest for this year (and next year)!
There will be prizes awarded to the top 5 competitors in the contest and a random participant (not in the top 5) with a non-zero score:
To redeem your prize after the contest, please join the DMOJ Discord and verify your account belongs to you; then, direct message maxcruickshanks.
You can write this contest in any two-hour window between December 30th, 00:00 EST, and January 2nd, 00:00 EST.
You can find more details about the contest on its contest page.
We hope to see you soon!
Hi everyone!
WOSS Dual Olympiad is back for 2022!
The contest will run from December 20th at 3:00 PM EST to December 23rd (inclusive of both days).
The contest consists of both individual rounds and a team round. The individual round is split up into two divisions, junior and senior.
The contest is hosted by WOSS Computer Science Club and WOSS Mathematics Club.
For more details, please see the respective contest pages: Junior, Senior and Team Round.
Good luck!
The winners of the prizes provided by are
All winners have been sent an email and, to claim their prize, must reply to it within 3 days.
Congratulations to all the winners!
Hi everyone!
Yet another time, this is 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, December 23rd to Monday, December 26th. Participants will have a 3-hour window to complete 6 problems.
Note that the contest is not rated for users with at least 2800 rating. This differs from the previous YAC.
Additionally, this contest has prizes courtesy of ! More details can be found on the contest page.
Good luck and have fun!
Hi everyone!
BSSPC is back for 2022!
The contest will run from Thursday, December 8th to Monday, December 12th. Participants will have a 3-hour window to complete 8 problems.
The contest will be rated for all participants with under 1900 rating.
For more details, please see the contest page.
Good luck!
We hope you enjoyed the DMOPC October... I mean November contest! We saw some new handles in the top 5 contestants this time:
Congrats to these contestants for their exceptional performance! See you soon!
We are back, and excited to announce that the second DMOPC of the new school year will be held this coming weekend!
The contest will run from Friday, November 25th to Monday, November 28th (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 EST of November 25th and 00:00:00 EST of November 29th.
Please see the contest page for more details.
Have fun!!