The DMOJ is a modern contest platform and archive of programming problems. It's also entirely open source.
So far, 99058 developers have submitted to 3699 problems a total of 3625848 times, using 67 languages.
If this is your first visit, please register an account. Then, try the Hello, World! problem.
Hi all,
We are happy to announce that PEG accounts and problems have been migrated to DMOJ, and can now be accessed.
Some usernames on PEG could not be assigned on DMOJ, as they were already in use. A _wcipeg suffix was added to the PEG username in these cases. You can check this list to see if this applies to you.
PEG accounts may be merged into existing DMOJ accounts (in the case you had an account on both DMOJ and PEG, and would like to merge them into one). To initiate this process, visit your profile page while logged in to your PEG account, and follow the instructions.
All PEG submissions were regraded on DMOJ judge hardware to keep rankings consistent. You may view a spreadsheet of aggregate rejudging results here. Submissions to a number of problems (mainly IOI) have not yet been assigned to migrated accounts, but will become available in the coming days.
Feel free to let us know of any questions you may have in the comments, in Slack, or by email.
Hi everyone!
From Friday, May 7 to Sunday, May 9, we'll be hosting An Animal Contest 2. Participants will have a 3-hour window to complete 7 problems centered around koalas! See the contest page for more details.
We hope you enjoy the problems and have fun!
See you soon!
Hi, everyone!
On Wednesday, May 5th, 2021, we’ll be running the first annual SAC Code Challenge!
You can write this year’s contest in any two-hour block between 8:00 EDT and 22:00 EDT. The contest will be composed of 5 problems with a similar difficulty gradient to the CCC Junior contest.
To register, please request to join the SAC Code Challenges group, making sure to follow the instructions. Please ensure you register BEFORE the contest date.
You can find more details on the contest page.
We hope to see you soon!
SAC Code Culture.
Thanks for participating in the DMOPC '20 April Contest!
Congratulations to the top 5 contestants!
See you next month!
From Saturday, April 24th to Monday, April 26th, we'll be hosting the April DMOJ Monthly Open Programming Contest!
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 24th and 00:00:00 EDT of April 26th. Please see the contest page for more details.
See you soon!
Hi everyone,
We are proud to present the second annual UCC Coding Competition, a 2-hour, 5-problem competition open to all high school students. The contest will run from 8:00am on Thursday, April 22 to 8:00pm on Monday, April 26 (Eastern Daylight Time).
To register, please follow the instructions on our official contest webpage. The contest will be hosted on DMOJ, and you will have to submit your personal information when joining this organization. Please ensure that you register before April 20.
An official honour roll will be published on the contest page, the top scorers will be named as "Coders of the Year", and schools will be ranked by the sum of the three highest scores from each school. As such, please be sure to tell other students in your school to participate (perhaps get your school's coding club involved)!
You can find last year's contest problems here. If you would like to prepare, you can try to solve these problems - they are also available on DMOJ here.
Good luck to all participants!
UCC Coding and Algorithms Academy.
Thanks for participating in the DMOPC '20 March Contest!
Congratulations to the top 5 contestants!
See you next month!
From Saturday, March 13th to Monday, March 15th, we'll be hosting the March DMOJ Monthly Open Programming Contest!
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 March 13th and 00:00:00 EDT of March 15th. Please see the contest page for more details.
See you soon!
Hi everyone!
Greetings from Appleby College!
With the CCC coming up very soon, we are proud to present our second programming challenge, and the first one that will be open to all user on the DMOJ Online Judge! The difficulty of the problems will range from CCC Junior to CCC Senior S3, and we hope that it'll be an interesting challenge to participants of all levels.
Contestants may write the contest in any 2-hour window between February 12th, 00:00 EST to February 15th 23:59 EST. Please see the contest page for more details.
Best of luck to all participants!
Thanks for participating in the DMOPC '20 January Contest!
Congratulations to the top 5 contestants!
See you next month!
From Saturday, January 30th to Monday, February 1st, we'll be hosting the January DMOJ Monthly Open Programming Contest!
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 9:00:00 EST of January 30th and 00:00:00 EST of February 1st. Please see the contest page for more details.
See you soon!
From February 5th to February 7th, we are ecstatic to host the third triennial (?) UTS Open contest! With the CCC in less than 2 weeks, this contest will be a great opportunity to hone and sharpen your problem solving skills. The difficulty of the problems will range from CCC Junior to CCO level, so there is definitely something to look forward to in this contest regardless of your skill level!
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 February 5th, 00:00 EST to February 7th, 23:59 EST. Please see the contest page for more details.
Best of luck to all participants!
From January 23rd to January 24th, we'll be hosting Wesley's Anger Contest 6!
After receiving feedback on the previous contests, we have decided to add an additional problem at the beginning of the contest. We expect this problem to be easier than all previous WAC problems. The contest will be post-Christmas themed! The problem authors will be , , , and .
Anyone with a DMOJ account is welcome to participate, and anyone without one is welcome to register and participate.
Contestants may participate in any 4-hour window between January 23rd, 09:00 EST to January 24th, 23:59 EST. Please see the contest page for more details.
Good luck to all the participants!
