Thanks to everyone who participated in this month's DMOPC!

Congratulations to the winners:

1. alei
2. ZQFMGB12
3. d
4. Butane
5. grikukan

We hope you enjoyed the contest! All problems have been moved to the main judge, and editorials may be found on the problem pages by clicking "Read editorial". See you next month!

On Tuesday, February 9, we'll be hosting the February Don Mills 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 12PM EST and 9PM EST. Please see the contest page for more details.

See you soon, and good luck!

Thanks to everyone who participated in this month's DMOPC!

Congratulations to the winners:

1. gendelpiekel (perfect score)
2. jeffreyxiao (perfect score)
3. d (perfect score)
4. Quantris (perfect score)
5. Butane

We hope you enjoyed the contest! Editorials can be found here. See you next month!

The contest was set by members of Cygnus Computer, a competitive programming club based in Bucharest, Romania. Cygnus has contributed to the localization of the site (you may change your language at the bottom of every page), and is now running a Romanian-language version of DMOJ at http://cygnus-computer.ro/arena/. Thanks!

On Tuesday, January 12th, we'll be hosting the January Don Mills Open Programming Contest!

Anyone with a DMOJ account is welcome to participate, and anyone without one is welcome to register and participate.

The problem writers this time are StellarCF, ionutpop118, and WallE256.

Contestants may participate in any 3-hour window between 12PM EST and 9PM EST. Please see the contest page for more details.

See you soon, and good luck!

Thanks to everyone who participated in the New Year's contest.

Congratulations to the winners:

1. zimpha (Perfect score)
2. d (Perfect score)
3. jeffreyxiao (Perfect score)
4. mehwar (Perfect score)
5. bruce (Perfect score)
6. grikukan
7. Butane
8. gongy
9. ZQFMGB12
10. pyrexshorts

A brief solution sketch can be found here. We hope you enjoyed the problem set and learned something new. Happy new year!

We hope everyone's been enjoying their winter break because it's about to get better!

In the coming week we will be hosting two contests: the Mackenzie New Year's Challenge, and DMOJ's own New Year's 2016 contest. Please see the contest pages for details.

Anyone with a DMOJ account is welcome to participate, and anyone without one is welcome to register and participate.

See you soon, good luck, and Happy Holidays from all of the DMOJ crew!

With the recent addition of Wikipedia-like user scripts, now you can change how the DMOJ looks and works! A user script is a small bit of customizable Javascript that is embedded into every page, and allows you to modify everything regarding the site's look. User scripts may be defined in the edit profile page.

For example, if you wanted to make the navigation bar non-sticky, you could use a simple script.

// Wait for page load
$(function() {
    // Select the navigation bar
    $("#navigation").css({
        // Update the CSS
        position: "absolute"
    });
});

Or perhaps you'd prefer a more festive look to the site.

$(function() {
    $("#page-container").css({background: "#FDDDDD"});
    $("body").css({background: "#99FFA8"});
});

Or even display an encouraging message on every page load.

$(function() {
    alert("You can do it!");
});

Glenforest Winter Open is back! Engage in one of our two contests both happening Monday, December 14th, starting 3:30pm EST. The junior contest will last 3 hours until 6:30pm EST and the senior contest will run one hour longer, until 7:30pm EST.

The senior contest may be significantly harder than the junior contest, and is recommended for those with a stronger handle on algorithms. You may choose to switch contests if you find one too easy or one too hard! Editorials will be released after the contest, and will be accessible on our organization page (along with past editorials as well).

TopCoder is hosting an SRM Monday, Nov 30th at 9PM EST.

Details: https://community.topcoder.com/tc?module=MatchDetails&rd=16624

Thanks to everyone who participated in this month's DMOPC!

Congratulations to the winners:

1. mexmans
2. pyrexshorts
3. Butane
4. d
5. Solipsist

We hope you enjoyed the contest! Editorials can be found here. We've added some extra "bonus" questions; feel free to comment and discuss them for extra practice. Lastly, if you have the time, we ask that you please fill out a short survey regarding your experience with this DMOPC to help us improve future contests.

See you next month!

On Tuesday, December 8, we'll be hosting the December Don Mills 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 12PM EST and 9PM EST. Please see the contest page for more details.

See you soon, and good luck!

Thanks to everyone who participated in this month's contest! Congratulations to the winners:

1. d
2. pyrexshorts
3. bugday
4. Solipsist
5. awaykened

Editorials may be found here. Feel free to post comments and ask questions.

We hope you enjoyed the contest, and see you next month!

Note: Some cheaters were discovered post-contest, and have been removed from ratings. These users are permanently banned from submitting to the problem in question. We will re-rate contests as necessary if more cheaters are discovered, whether in the most recent November contest or any of our previous contests. If you wish to report an offending submission, please email dmopc - at - dmoj.ca.

On Tuesday, November 10, we'll be hosting the November Don Mills 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 12PM EST and 9PM EST. Please see the contest page for more details.

See you soon, and good luck!

The contest is now over. Thanks to everyone who participated, we've broken our previous record of participants for the DMOPC! You may access the scoreboard here.

Congratulations to the winners!

1. trophies (perfect score)
2. Butane (perfect score)
3. pyrexshorts (perfect score)
4. jeffreyxiao
5. d

Editorials may be found here.

Finally, if you have the time, we ask that you please fill out a short survey regarding your experience with this DMOPC to help us improve future contests.

On Tuesday, October 13, we'll be hosting the first Don Mills Open Programming Competition of the 2015-2016 school year!

Anyone with a DMOJ account is welcome to participate, and anyone without one is welcome to register and participate.

We'll be using a new format for the competition this year. The DMOPC will run as a 3-hour virtual contest, which will allow contestants to participate in any 3-hour window between 12PM EDT and 9PM EDT. Please see the contest page for more details.

See you soon, and good luck!

With the start of a new contest season, we thought it was a perfect time to update the look and features of this site to be both more modern and more usable.

Aside from the macro changes (new header, etc.), here are a couple of things you may not have noticed that we hope will make your life better:

• You can now be part of multiple organizations.
• A nice "Copy" button for problem sample input and output has been added. Surprisingly useful.
• C/++ compiler warnings and errors are now colored (Java will follow).

ccc07j1.cpp:10:32: error: expected primary-expression before ‘||’ token
     else if (y <= z && y >= x) || (y <= x && y >= z))) printf("%d", y);
                                ^

• The site now scales properly to large screens.
• Contest start/end date, length and contest window are displayed in a more readable format.

• The contest timer looks better, and no longer overlaps the Submit button.
• A contest rating chart has been added on user pages.
• You can nowHide problems I've solved on another user's problem page.
• Improved problem searching: form auto-submits so you don't need to click "Go" every time, and the table may be sorted by state now.
• You can also search problems if you're not logged in now. For some reason, this wasn't possible before.

Most importantly of all, we are interested in your opinion on the changes. Love them? Hate them? Want a feature? Let us know!
Found a bug? Perfect! Report it on Github.