The DWITE Online Computer Programming Contest was a popular contest that ran from 2002 until its discontinuation in 2012.

Since the data is publicly available (and had been lying around on our servers for the better part of 2 years), we've released the first batch of DWITE problems on the DMOJ. There's 150 in all, which will be released in full over the next few days. You can view them here.

Many thanks to Cthulhu, aeternalis1, BenjaminBLi, and kipply who helped format the questions.

Since there's over a hundred new problems, chances are high that there will be formatting errors in the them: if you find any, please do let us know on Slack.

Thanks for participating in the DMOPC '17 October contest!

The winners are:

1. tankturtle (perfect score)
2. ivan100sic (perfect score)
3. y0105w49 (perfect score)
4. d (perfect score)
5. bruce (perfect score)

Editorials for each of the problems will be uploaded to the respective problem pages.

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

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On Tuesday, October 10th, we'll be hosting the October 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 noon EST of Oct. 10th and noon EST of Oct. 11th. Please see the contest page for more details.

See you soon!

Thanks for participating in the TLE '17 September contest!

The winners are:

1. bqi343
2. y0105w49
3. r3mark
4. Paradox
5. zhouzixiang2004

Editorials for each of the problems will be uploaded to the respective problem pages.

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

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We're excited to invite you to the first Thorndeau Logic Evaluation of the 2017-18 school year!

The TLE this year will be a combined effort of Pierre Elliott Trudeau High School and Thornhill Secondary School students and alumni. Anyone with a DMOJ account is welcome to participate and anyone without one is welcome to register and participate.

The TLE '17 September contest will be a 3-hour virtual contest, which will allow contestants to participate in any 3-hour window from 4:00 PM EDT to 11:00 PM EDT on September 29, 2017. Please see the contest page for more details.

See you soon!

Thanks to everyone who participated, and congratulations to the winners!

1. bqi343
2. y0105w49
3. imaxblue
4. r3mark
5. Eliden

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It's that time of the (school) year again, and to celebrate, we present the Back to School '17 contest! Get back into your tip top programming shape and start the school year with a new rating!

Back to School '17 will consist of 8 problems, with difficulty ranging between CCC Junior to IOI level.

You can choose a single 4 hour period between September 9 and September 10 EDT.

See the contest page for more details.

Thanks for participating in BFS '17!

The winners are:

1. bqi343
2. imaxblue
3. d

The winners will be contacted shortly about their prizes. Editorials will also be up shortly on the respective problem pages. In the meanwhile, we ask all contest participants to fill out a quick survey so we can improve future contests.

Survey here

We hope you see you next year!

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Summer is just about over, and school is around the corner. We hope you had a great summer, and we want to make your school year even greater by kicking off with a new rated contest, including Amazon gift cards as prizes!

The contest will take place in a 2-hour window anywhere from Friday 3:30 PM - midnight EDT, and will consist of 6 problems of CCC Junior - CCC Senior difficulty.

See the contest page for details on contest rules and prizes.

Thank you to everyone for coming out to the 3rd annual Don Mills Programming Gala!

Congratulations to our winners:

Gold Division

1. ZQFMGB12
2. r3mark
3. imaxblue, WilliamH

Silver Division

1. Paradox
2. Tan, lpang
3. sunnylancoder, fungucide420

Bronze Division

1. Day, putonium
2. DishonestHips, Hypnova
3. Gthtjkt

We hope to see you all next year! A link to the archive can be found here.

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As the academic year comes to an end, we'll be holding our final DMOPC in the form of the Don Mills Programming Gala.

This event will take place at Don Mills C.I. on Monday, May 15^th.

The contest will be split into three divisions of increasing difficulty, with prizes awarded to the top competitors. For interested competitors unable to attend the on-site event, we will also be hosting mirrors of the divisions, open for anyone to participate in.

Space is limited, so sign up soon! More details and registration options may be found here. You can find the results of last year's DMPG here.

Registration is now closed. Thank you for your continued interest.

Thanks for participating in the TLE '16 April contest!

The winners are:

1. y0105w49 (perfect score)
2. lg52931
3. uwi
4. zhouzixiang2004
5. imaxblue

Editorials for each of the problems will be uploaded to the respective problem pages.

We hope you enjoyed the contest, and thanks to all who participated in the TLE rounds throughout the 2016-17 school year!

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We're excited to invite you to the eighth Trudeau Logic Evaluation of the 2016-17 school year!

This TLE round will be the last online round of the 2016-17 school year!

The TLE '16 April contest will be a 3-hour virtual contest, which will allow contestants to participate in any 3-hour window from 12:00 PM EDT to 11:00 PM EDT on April 20, 2017. Please see the contest page for more details.

See you soon and good luck!

Thanks for participating in the TLE '16 March contest!

The winners are:

1. y0105w49
2. kobortor
3. thomas0115
4. zhouzixiang2004
5. percywtc

Editorials for each of the problems will be uploaded to the respective problem pages.

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

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We're excited to invite you to the seventh Trudeau Logic Evaluation of the 2016-17 school year!

The TLE '16 March contest will be a 3-hour virtual contest, which will allow contestants to participate in any 3-hour window from 12:00 PM EDT to 11:00 PM EDT on March 23, 2017. Please see the contest page for more details.

See you soon and good luck!

All problems from this year's CCC have been added. You may access them here.

Editorials for most problems can be found on their respective pages — please remember to use these editorials only when stuck, as copy-pasting code from them will see you permanently banned from submitting that problem.

Hope you enjoyed this year's CCC!

Over the past few weeks, we have been trialing a new system for ranking users based on points. After a number of revisions based on suggestions from those enrolled in experimental features, we feel the system is stable enough as-is to make public.

Why a new system?

The old system over-awarded those who spent time "farming" a large number of easy problems, and under-rewarded those who spent time figuring out more complex solutions. The new system hopes to strike a balance in ranking between users who solve many problems, and users who solve fewer — but harder — problems.

How are points calculated?

In short, the new points system takes the weighted sum of the top 100 submission scores on distinct problems. The score of the problem is weighted by . Formally, where represents sorted scores and a user's base points,

To not over-penalize users who have dedicated time to solving many problems, an additive adjustment is made to the base point value. Where is the number of problems a user has a fully-accepted solution on,

A user's point score is then the sum .

How can I see a problem's contribution to my points?

A new table has been added to the Problems tab of profile pages, which displays the 100 submissions used in the generation of their point score, as well as their weights.