The Don Mills Online Judge publishes solutions to many contest problems for educational purposes. However, it is suggested that you only use this service when stuck, and to help in coming up with your own solution. Copy and pasting solutions directly does not demonstrate programming ability.

If you have a solution to contribute to any problem, feel free to email us at admin -at-



  • 1
     commented on Dec. 5, 2016 edited
    one eternity later...


  • 1
     commented on Aug. 15, 2016
    Solution Dropdown

    I noticed that Editorials is no longer available from the Problems dropdown menu, is this intended?

    • 2
       commented on Aug. 16, 2016

      Yes, they are now instead accessible from a tab on the problems list. A similar change was done for organizations.

      Individual editorials may be accessed from the problem pages directly, where the problem author has configured the solution system to do so.

  • 7
     commented on March 15, 2016
    Online grader down?

    I tried to submit some code but it kept "looking for a suitable judge". Now it won't let me make any more submissions

    • 0
       commented on March 15, 2016

      We're aware of the issue and are looking into a resolution.

      • 0
         commented on March 15, 2016

        Normal service is resumed.

    • 4
       commented on March 15, 2016

      I bet you the judge got ddosed..

  • 7
     commented on Nov. 11, 2015 edited
    Reminder to All Users

    This is a reminder to all users that the copy and pasting of editorial solutions is forbidden. Not only does it defeat the purpose of learning programming, it is an act of disrespect to the problem author, the editorialist, as well as everyone who solved the problem through their own hard work and thinking.

    DMOJ was developed as a platform for educational pursuits. As such, academic dishonesty is highly frowned upon. It is understandable to look for ideas in the editorials when you're lost, but a whole different story to blatantly copy and paste.

    On a similar note, we hope that recent events will remind everyone that our new virtual contest format depends on everyone's honesty. We have implemented the new format in order to accommodate for everyone's schedule, it would be unfortunate for us to have to return to the old format because of select individuals.

    To end on a good note, we hope that you enjoyed the recent contest and learned something new!

    Edit: New users should refer to our Terms of Service.

    • -3
       commented on Nov. 12, 2015 edit 2

      This seems kinda harsh. -9999? That's like bobhob314 level.