Announcements (Search)

Re-introducing: Woburn Challenge!

by Alex on Oct 06, 2015 - 5:30:32 am UTC
  • (5/0)
Edit: The contest is over! Many thanks to all of you who participated. We will be posting prizewinners and analyses to all of the problems shortly. Check here, as well as our website periodically!

Edit 2: The problems have been cloned to the main judge. Feel free to submit to them for practice while we work on publishing results and analyses.
Junior Problems: J1, J2, J3, J4
Senior Problems: S1, S2, S3, S4


From the mid-1990s to the early 2000s, the Woburn Challenge was an annual computer programming competition hosted and run by Woburn C.I.'s Programming Enrichment Group. We feel that the time is right to relaunch this free and fun competition for aspiring computer science students in Canada. This year, we're prepared to give out thousands of dollars in prizes to top-performing primary and secondary school students in Canada. If you are a Canadian primary or secondary school student (grades 1-12), you must follow the registration instructions at to be officially eligible for prizes. While only this group of people can receive prizes, everyone is welcome to participate in the online rounds as observers.

This year, we're hosting 4 online rounds (each with a prize pool of over $500) and an in-person invitational finals at the end of the school year (even larger prizes to be announced!). The rounds will take place in October, December, February, April, and early June (for the finals).

Online Round 1

When: Friday, October 16th, 2015 from 3:30 pm to 6:30 pm ET
Where: The PEG Judge interface (
Format: 2 divisions, 3 hours, 4 problems, infinite submissions, and live feedback.
  • 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:
For more details, visit For questions, email [email protected].

Good luck!

I have removed all the old SHA-1 hashes, so if you didn't login or change your password during the last 30 days as instructed by a previous announcement, you will no longer be able to login.

If you can't login, please use the forgotten password feature to reset your password and set the new bcrypt hash.

The 30 day deadline given in has almost expired.

If you haven't logged in or changed your password since the announcement, you must do so by tomorrow, otherwise you will not be able to log in and will need to use the password reset feature to reset your password before you log in again.

Please note that simply browsing the site while logged in is not sufficient. You must log out and back in again so that your password will be hashed using the new hashing algorithm.

IOI 2015 problems have been (partially) added

by Alex on Sep 05, 2015 - 11:16:47 pm UTC
  • (3/0)
The non-interactive problems from IOI 2015 have been added. Please report any issues you find.

Day 1, Problem 1 - Boxes with Souvenirs
Day 1, Problem 3 - Teams
Day 2, Problem 1 - Horses
Day 2, Problem 2 - Sorting

The PEG Judge has switched to a more secure password hashing scheme. From now on, your passwords will be hashed securely using bcrypt.

Within the next 30 days, if you log in or change your password, the new password hash will be activated for your account. Please note that we cannot generate the new password hashes without you entering your password on the site, because the old passwords are still hashed (and not stored in cleartext).

In 30 days from now, the old, less secure hashes will be deleted from the database. If you do not log in or change your password within 30 days of this announcement, you will not be able to log in and will need to use the forgotten password feature in order to reset your password.

CCO 2015 Problems Added

by Alex on Jun 05, 2015 - 11:08:55 pm UTC
  • (1/0)

Suggest some tags!

by jargon on May 02, 2015 - 3:42:13 am UTC
  • (0/0)
Better problem tagging infrastructure is on its way, and we need help figuring out which tags would be useful!

Please reply to this post with suggestions.

CodeIgniter upgraded to 3.0

by bbi5291 on Apr 30, 2015 - 6:12:58 am UTC
  • (1/0)
This is a major change to the PEG Judge's codebase. I have tested to make sure most features on the site are still working, but some may be broken. Please report bugs here.

In addition, you might need to clear your cookies before you can log in again.

Revamped Main Page

by Alex on Apr 28, 2015 - 11:49:20 pm UTC
  • (1/0)
A few of the admins and I have been working hard to bring you a new streamlined main page. Don't forget to Ctrl-F5 or Shift-F5 to refresh the CSS! Many of the general comments have been moved to this sticky thread. Feel free to tell us if you have any concerns or run into bugs.

From now on, we are looking forwards to bringing you more frequent updates in site improvements. Stay tuned!

Post general comments here

by Alex on Apr 28, 2015 - 11:48:46 pm UTC
  • (3/0)
This is the place to post general comments, such as pressing bugs or broader questions.