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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 1114 problems, 420587 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 Finals Results

by Alex on May 07, 2017 - 2:28:59 pm UTC
Thank you all who joined us for the Woburn Challenge 2016-17 on-site finals! Yesterday we witnessed 10 schools battle it out for the title of Woburn Challenge champion. In the end, Jason Yuen and William Wen of Pierre Elliott Trudeau High School came out on top of the senior and junior divisions respectively. Thank you to contestants and teachers alike, who stayed with us through to the end of the season.

The contest problems have been cloned to the main judge: J1, J2, J3/S1, J4/S2, J5/S3, S4, S5.
Problems, solutions, and test data will be posted shortly to this page. We truly hope that you enjoyed tackling them.

The senior division prizewinners are:
  • Jason Yuen of Pierre Elliott Trudeau High School ($250)
  • Brian Chau of Woburn Collegiate Institute ($200)
  • Joey Yu of Thornhill Secondary School ($150)
The junior division prizewinners are:
  • William Wen of Pierre Elliott Trudeau High School ($150)
  • William Fung and Sunny Lan of Richmond Hill High School ($100)
  • Jeffrey Gao and Richard Yi of William Lyon Mackenzie Collegiate Institute ($75)
Congratulations! We would love to hear your feedback about how to improve for next year, so please send them to [email protected] Have a great summer, and don't stop practicing!

Woburn Challenge round 4 results are now available!

by Alex on Apr 15, 2017 - 7:09:43 am UTC
Thank you for joining us for the final online round of the year! We found the problems for this round to be tough but fair. There were several perfect scores in both divisions despite how challenging the problems have become. Superb! Problems, solutions, and test data are now posted here.

The senior division prizewinners are:
  • Brian Chau of Woburn Collegiate Institute ($200)
  • Leo Feng of Vincent Massey Secondary School ($100)
  • Arielle Shannon of University of Toronto Schools ($50)
  • Zixiang Zhou of University Heights Public School ($50)
  • William Wen of Pierre Elliott Trudeau High School ($50)
The junior division prizewinners are:
  • Justin Pu of William Lyon Mackenzie Collegiate Institute ($50)
  • Allan Xu of Woburn Collegiate Institute ($25)
  • Arsh Raza of William Lyon Mackenzie Collegiate Institute ($25)
Congratulations! These prizes will be distributed as Visa gift cards, and we will be contacting your teachers shortly about sending them out.

The date of the Woburn Challenge on-site finals will be released in the middle of next week, when the invitations will also be sent out. Be on the lookout!

Woburn Challenge Online Round 4

by Alex on Mar 20, 2017 - 3:46:59 am UTC
Edit 2: Test data and analyses are now available here. Results will be posted by the end of the week. Stay tuned for finals invitations!

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 J3 and S1 are the same question, as are J4 and S2. Thus, submissions to J3/J4 are not moved over and junior competitors will have to resubmit them to S1/S2 on the main judge.

Problems: J1, J2, J3/S1, J4/S2, S3, S4

Are you ready for the last round of the year? To be eligible for prizes, you must be a Canadian high school student, and must have completed this year's registration form (woburnchallenge.com/register) even if you have participated last year. However, everyone else is welcome to participate as an observer. Remember that this is the final online round which can help you and your school secure a position at our invitational finals in May!

2016-17 Online Round 4

When: Sunday, April 9th, 2017 from 2:00 pm to 5:00 pm ET
Where: The PEG Judge interface (wcipeg.com/contests)
Format: 2 divisions, 3 hours, 4 problems, infinite submissions, and live feedback.
Prizes:
  • Top 3 Junior division winners: $50, $25, $25
  • Top 5 Senior division winners: $200, $100, $50, $50, $50
Full format and rules can be found at: woburnchallenge.com/contest
For more details, visit woburnchallenge.com. For questions, email [email protected].

Finally, 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!

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