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Welcome to the PEG Online Judge. This site was created by members of Woburn Collegiate Institute's Programming Enrichment Group as a resource for competitive programmers everywhere. We also run PEGWiki, a site for information and tutorials of algorithms.

Currently, we have 1174 problems, 495641 submissions, 277 analyses, and support for 15 languages.

If you are new here, register an account and get familiar with the judge by solving A plus B. Alternatively, you can try a random problem that you haven't solved.


Announcements (See All)

Woburn Challenge round 4 results are now available!

by Alex on Apr 23, 2018 - 1:30:16 am UTC
Thank you for joining us in our fourth online round, new and returning participants alike. Our anticipation for the premiere of Avengers: Infinity War is surpassed only by our anticipation for the finals next month! Problems, solutions, and test data are now posted here.

The senior division prizewinners are:
  • Brian Chau of Woburn Collegiate Institute ($100)
  • Zixiang Zhou of University Heights Public School ($50)
  • Alex Xu of White Oaks Secondary School ($25)
  • Joey Yu of Thornhill Secondary School ($25)
  • Ava Pun of Marc Garneau Collegiate Institute ($25)
  • Henning Jiang of Vincent Massey Secondary School ($25)
  • Sunny Lan of Richmond Hill High School ($25)
  • Andrew Tang of Erindale Secondary School ($25)
The intermediate division prizewinners are:
  • Michael Huang of Bell High School ($50)
  • Aaron Tang of Churchill Heights Public School ($25)
  • Yi Deng of William Lyon Mackenzie Collegiate Institute ($25)
  • Evan Zhang of William Lyon Mackenzie Collegiate Institute ($25)
Finally, a job well done to the top Junior finishers with perfect scores: Henry Guo of A.Y. Jackson S.S., Michael Sheinman of Grimsby S.S., Eric Gu of Glenforest S.S., and Robert Chung of Churchill Heights P.S. To all you juniors who are doing so well – we suggest moving yourself up to intermediate next year for an even greater challenge!

Congratulations! These prizes will be distributed as Visa gift cards during the on-site finals in May. Do not fret if you may not be able to make the final round in person – we will mail your prize to you afterwards.

P. S. The date and location of the finals will be released during the week, when invitations will also be distributed. Be on the lookout!

Woburn Challenge Online Round 4

by Alex on Apr 11, 2018 - 7:54:36 am UTC
Edit: The contest is over! Many thanks to all of you who participated. The questions have been cloned to the main judge. We will be posting prizewinners and analyses to all of the problems shortly. Check here, as well as our website periodically! Feel free to submit to them for practice while we work on publishing results and analyses. Note that questions are shared between divisions. In particular, submissions to all intermediate problems are not moved over and intermediate competitors will have to resubmit them on the main judge.

Problems: J1, J2, J3/I1, J4/I2, I3/S1, I4/S2, S3, S4

The end is nigh. Let's see what you've got in the last round of the year.

To be eligible for prizes, you must complete this year's registration form (see woburnchallenge.com/register) even if you have participated last year. If you have already completed in rounds 1 to 3, you do not need to do so again. If you have an existing PEG Judge username, you can continue using it. All Canadian high school students are eligible for prizes (you must be first registered through the aforementioned website), but everyone with a PEG Judge account is welcome to participate.

2018 Online Round 4

When: Friday, April 20th, 2018 from 3:30 pm to 6:30 pm ET
Where: The PEG Judge interface (wcipeg.com/contests)
Format: 3 divisions, 3 hours, 4 problems, infinite submissions, and live feedback.
Prizes:
  • Top 8 Senior division winners: $100, $50, $25, $25, $25, $25, $25, $25
  • Top 4 Intermediate division winners: $50, $25, $25, $25
Full format and rules can be found at: woburnchallenge.com/contest
For more details, visit woburnchallenge.com. For questions, email [email protected].

Please forward this to your friends (especially at other schools) who are interested in computer programming -- we want to get more students involved!

Good luck and enjoy the problems!

P.S. Just a heads up that the on-site finals (by invitation) will take place in the middle of May. We have our sights set on Sunday, May 13th but this remains to be finalized. More details will be given after the 4th round is over, when invitations will be sent out.

Woburn Challenge round 3 results are now available!

by Alex on Mar 28, 2018 - 2:36:02 am UTC
Thank you for joining us in another round, new and returning participants alike! The finals are coming into view, and we hope you’re finding our questions more mind-bending than ever! Problems, solutions, and test data are now posted here.

The senior division prizewinners are:
  • Brian Chau of Woburn Collegiate Institute ($100)
  • Zixiang Zhou of University Heights Public School ($50)
  • Ava Pun of Marc Garneau Collegiate Institute ($25)
  • Allan Xu of Woburn Collegiate Institute ($25)
  • Evan Yu of Iroquois Ridge High School ($25)
  • Arielle Shannon of University of Toronto Schools ($25)
  • Henning Jiang of Vincent Massey Secondary School ($25)
  • William Huang of Woburn Collegiate Institute ($25)
The intermediate division prizewinners are:
  • Michael Huang of Bell High School ($50)
  • Sharujan Sreekaran of Glenforest Secondary School ($25)
  • Aaron Tang of Churchill Heights Public School ($25)
  • Jeffrey Gao of William Lyon Mackenzie Collegiate Institute ($25)
Finally, we would like to applaud a job well done to the top Junior finishers (all with perfect scores): Robert Chung of Churchill Heights Public School, and Henry Guo of A.Y. Jackson Secondary School.

Congratulations! These prizes will be distributed as Visa gift cards during the on-site finals in May to which all of the above winners are invited (more details to come later). Do not fret if you may not be able to make the final round in person – we will mail your prize to you afterwards. Remember that we will have many prizes in the remaining rounds of the year, so keep on practicing!

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