We've added an API for accessing most public data used by the DMOJ.

You can read the documentation here.

Anything you'd like added to the API, or think we've missed? Please let us know in the comments!

Update 2015-02-15: the contest has been extended to Monday, February 16th, so that those who had plans for Valentine's Day get a chance to write the contest.

Things go awry this Valentine's day when the Ice King kidnaps everyone in the land of Ooo for a wooing session! Try not to get your socks and hat and limbs blown off as you read of the recent events in the Ice Kingdom!

The Valentine's Day 2015 contest will consist of three problems of medium-level difficulty. The contest will run on February the 14th from 12:00AM to 11:59PM EST. Within this window, you will have 3 hours to write the contest.

The problem writer is bobhob314.

Visit the contest page for more details.

The 2015 Canadian Computing Competition is around the corner. Users FatalEagle and Alex have prepared another mock CCC for you to test your might.

• When: The contest window will be between Friday, Feb 13 at noon (EST) and Monday, Feb 16 at midnight (EST). Any time during this period, you may enter the contest and your personalized timer will count down from 3 hours.
• Where: Right here on the DMOJ Judge! Head over to the contests section of the site and click "Join contest" when the time period begins. The contest will also be available on the PEG Judge.
• Format: 5 problems for junior and 5 problems for senior, just like the real CCC. Each problem will be worth 15 points, and each contest is out of 5*15 = 75 points. There will be full-feedback for your submissions, and tie-breaker is the sum of times used to solve problems (although such a metric won't be used on the real CCC).

Analyses will be provided after the contest period. Good luck!

Update: Thank you to all who participated!
Below are the problems for you to solve post-contest:

New Key
Redirection
Golden Lily
Sketchley Park
Aircraft Carrier Akagi
Save Nagato!

On Tuesday, February 10 at 3:30 PM EST we will be hosting the DMOPC '14 February. Anyone with a DMOJ account is welcome to participate, and anyone without one is welcome to register and participate.

Upd. 2015-03-25: the new comment system is in place.

Upd. 2015-02-02: over 100 comments were deleted today, bringing comment count down from 672 to 551.

Over the past few months we've had many users participate in comment threads across many problems. While we encourage a lively community, we'd also like to keep discussions focused and on-topic, which in the last few weeks has not always been the case.

A number of people have noticed the lack of an Edit option for comments. This is not a bug or oversight; it's by design. We encourage you to think about what you want to write before writing it, knowing that your comment is immutable and there to stay. In this sense, we're promoting well thought-out comments. The lack of an Edit option is not so that you can reply to your own comment with revisions or addendums! Having massive Re: Re: Re: Re: Re: Re: chains was certainly not a design goal, and we'll be taking steps to prevent these in the future.

But we can't do so without everyone's cooperation. In the future, we ask that everyone attempt to follow a set of simple guidelines when posting.

Commenting Guidelines

Before posting, ask yourself:

• Will someone reading my comment a year from now find it useful? If not, then you probably shouldn't post it.
• Will I regret posting this comment in five minutes? If so, you shouldn't post it. Listen to yourself.
• Is my comment meaningful? Comments like "uw0tm8" are unwelcome.
• Is the thread I'm commenting on longer than the problem itself? If it is, do you really have something of value to add?

This is not to say that jokes or witty comments are unwelcome. They're fine. If you think your comment relates to the problem and is funny for the majority of people who will read it (i.e. not an inside joke only you and your friend will understand — we're not Facebook), then by all means post ahead! If you can brighten someone's day while remaining even remotely on topic, that's great.

And these are just guidelines. If you feel really justified in posting something, use your judgement.

Comment Cleanup

At this time, many problem threads are cluttered with off-topic chatter of little value.

To resolve the issue of noise comments, we'll be retroactively applying the guidelines above to threads that we feel need it. This means that we'll be both editing and deleting comments that need attention. Over the next few days, you might have some of your comments deleted. If you feel strongly about a comment that we might delete, please do not hesitate to contact us: we store comment records, and they won't disappear if your comment does.

We'll also be rolling out revision-based comment edit system sometime _relatively soon. Being able to edit your comments does not mean you should not follow the simple guidelines listed above. We're adding it for the incidental case of typos and such, and your comment's edit history will be public.

Thanks, your admins: Xyene, FatalEagle, and quantum.

Update: Thank you to all who participated!
If you were not able to take part (probably due to actual exams), below are the problems for you to solve post-contest:

French Homework
Physics Duel
Chemistry Homework
Exam Delay
Happy Teachers
Math Homework

The first Don Mills Open Programming Competition of 2015 will be held on Tuesday, January 13 from 3:30 to 8:30 PM.

There were initially no plans for a January Contest due to exams, which is why Sentient came up with a contest based on exams! Therefore you may think of this as the January Contest, except that it will be 5 hours long rather than the usual 3 (the difficulty will remain similar to previous DMOPCs and it should take most participants about an hour to solve the first 3 problems).

You can access the contest page here.

Back in the days students were forced to choose between studying for their school exams and participating in programming contests. No more will they have to endure such harsh conditions! With the creation of the Exam Time Contest, you can prepare for your exams as you complete the questions in this contest.

Moreover, what was supposed to be an ordinary exam week at Don Mills takes a turn for the extraordinary in the last few problems.

Do you find yourself with nothing to do even on December 25?

Xyene and Kirito have prepared a contest for this day. The contest will last for 4 days, and there are 3 problems in total.

The theme is about trees. If you like trees or want to learn more about graph theory, you should check out this contest.

https://dmoj.ca/contest/christmastree