Tech Retreat is a student run hackathon and learnathon for students who currently attend or will graduate from high school this summer. It is happening on the 15th of August at the University of Waterloo and is open to anyone, no experience required! It will be a great opportunity to learn about tech and programming, network with peers, and to explore the University! And yes, there will be free food, swag and a guaranteed good time!

For more information, you may visit the event website at techretreat.ca.

Update: registration is now open.

On Tuesday, May 5 at 3:30 PM EST we will be hosting the DMOPC '14 May Contest.

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

See you soon, and good luck!

April 20th, 2015. The day that Mr. Benum the CS teacher vanished into thin air. It was apparent that Mr. Benum would not be back for a while, so a replacement teacher showed up. He went by "Mr. Venom". A sketchy name, but there's more. He wasn't listed on any teacher database we hacked up; he had no online presence. Even stranger, Mr. Benum had not notified anyone of his absence. And Mr. Venom randomly applied for a job at Thornhill S.S. on the exact day that Mr. Benum disappeared.

No one suspected a thing, except for the members of the computer club. They knew that some shady dealings had occurred, and that they now had to save Mr. Benum from evil forces. Can they rescue Mr. Benum in time to celebrate on this very special day?

Help guide the young investigators rescue their teacher and defeat the evil Mr. Venom in the TSOC '15 #2 Contest!

Problems were authored this time around by gah111, BMP, bobhob314 and kobortor.

The contest will run for three days starting on April 20th, 2015. You will have three hours to complete the problems. There will be six problems of increasing difficulty, along with one bonus problem.

This round will be rated for all participants.

On Tuesday, April 7 at 3:30 PM EST we will be hosting the DMOPC '14 April Contest.

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

See you there, and good luck!

The problems for this year's ECOO round 1 competition have been added to the DMOJ.

• When You Eat Your Smarties
• Word Wrap
• Ten Pin Trig
• Neanderthal Numbers

Enjoy, and if you'll be competing in the next round, good luck!

dmoj.ca is now available over HTTPS to protect your privacy and identity. We value your security greatly, and have gone to all lengths to ensure that your password is safe and your session remain unhijacked. You can now safely browse dmoj.ca at an Internet café or an insecure school network without any fears of being eavesdropped on or impersonated. As an added bonus, pages should now load faster on browsers that support the SPDY protocol — in other words, all modern browsers.

View the Qualys SSL Labs report for DMOJ.

On a related note, dmoj.ca now delivers its assets over the domain https://dmoj.ml. This is done for performance reasons, mainly to save cookie overhead and better exploit caching. Along with the move of static content to dmoj.ml, we've also seen fit to drop the www. prefix of dmoj.ca — www.dmoj.ca now redirects to dmoj.ca (this is why all your visited links are blue again).

We'll continue to optimize and enhance the usability of the DMOJ in the coming month. Progress is publicly tracked on Github, where you can also find what changes are in store for April.

Update 2: The correct date is actually April 2, 2015.

Update: The contest has been postponed to April 3, 2015.

The springtime of your adolescence is here! On Thursday, April the 2nd, take part in the 2nd GFSSOC, which will feature separate contests for the junior and senior level. Anyone with a DMOJ account is welcome to participate, and anyone without an account is welcome to register and participate.

The theme of this contest will be past GFSS computer science club head Calvin Liu, who is not with us anymore. RIP Calvin (2010 - 2014)

A reminder for anyone stuck on past GFSSOC questions to visit our organization page, where there is useful information. Detailed solutions for this contest will also be posted here the day after it is over.

Contest ratings similar to TopCoder's rating system have recently been implemented on the DMOJ. Rating is a direct indicator of how likely you are to beat someone else in any given contest. The higher your rating is compared to another person, the more likely you'll place better! There are currently six ranks, based on the numerical value of the rating.

The default rating for users is 1200.

Rating is calculated using your rank on all rated contests you participated in, while also taking into account your competitors.

To view your rating, go to http://www.dmoj.ca/user/HANDLE/rating. For example, to view quantum's rating, go to http://www.dmoj.ca/user/quantum/rating.

The ratings displayed on a post-contest scoreboard is the new rating of the user after they participated in the contest.

Update: Contest is over! Ratings are updated, thanks for participating!

[Contest Announcement]

What: Three hard data structures problems!

When: Until March 23, 2015 midnight EDT.

Where: http://www.dmoj.ca/contest/mmcc15