Hi all,

Due to a failed database upgrade, some data were temporarily lost. Due to an unfortunate coincidence, the backups were temporarily unavailable, so I had to recover the data using some more sketchy means. I believe all data have been recovered successfully, but if you notice any unexpected errors over the next few weeks, please report them here.

Thank you for joining us in a new season, new and returning participants alike! This round was certainly a learning experience for us. The system has been improved, so we are hoping for the best in round 2. Problems, solutions, and test data are now posted [url=http://woburnchallenge.com/past-contests/]here[/url].

The senior division prizewinners are:
[list][*][b]Zixiang Zhou[/b] of London Central Secondary School ($100) 
[*][b]Andrew Qi Tang[/b] of Erindale Secondary School ($50)
[*][b]Royi Luo[/b] of Richmond Hill High School ($25)
[*][b]Sunny Lan[/b] of Richmond Hill High School ($25)
[*][b]Alex Tianyi Xu[/b] of White Oaks Secondary School ($25)
[*][b]Michael Huang[/b] of Bell High School ($25)
[*][b]Anish Mahto[/b] of Turner Fenton Secondary School ($25) 
[*][b]Brian Chau[/b] of Woburn Collegiate Institute ($25)[/list]The intermediate division prizewinners are:
[list][*][b]Evan Zhang[/b] of William Lyon Mackenzie Collegiate Institute ($50)
[*][b]Aaron Tang[/b] of Churchill Heights Public School ($25)
[*][b]Yi Deng[/b] of William Lyon Mackenzie Collegiate Institute ($25)
[*][b]Robert Chung[/b] of Woburn Collegiate Institute ($25)
[/list]Finally, we would like to applaud a job well done to the top junior division finishers: [b]Albert Lai[/b] and [b]Jerry Zhu[/b] of Pierre Elliott Trudeau High School, [b]Eric Pu[/b] of Stephen Lewis Secondary School, and [b]Eric Wang[/b] of Glenforest 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!

Hi all,

We apologize for the issues with grading Woburn Challenge submissions today.  High levels of participation, problems with a large number of test cases, together with poor architectural decisions that I take responsibility for, resulted in the Judge coming under more load than it could handle and forced us to effectively run the contest in "offline submission" mode. I have identified the root causes and will fix them before the next round.

[b]Edit 2: All solutions have been judged, and final results will be announced over the next few days. Problems and submissions have been copied to the main judge. Note that questions are shared between divisions. In particular, submissions to all intermediate problems are not moved over and intermediate contestants will have to resubmit to get points on the main judge.[/b]

[b]Problems:[/b] [url=http://wcipeg.com/problem/wc181j1]J1[/url], [url=http://wcipeg.com/problem/wc181j2]J2[/url], [url=http://wcipeg.com/problem/wc181j3]J3/I1[/url], [url=http://wcipeg.com/problem/wc181j4]J4/I2[/url], [url=http://wcipeg.com/problem/wc181s1]I3/S1[/url], [url=http://wcipeg.com/problem/wc181s2]I4/S2[/url], [url=http://wcipeg.com/problem/wc181s3]S3[/url], [url=http://wcipeg.com/problem/wc181s4]S4[/url]

[b]Edit: The contest is over! We realize that the submission queue for this round was heavily backlogged and apologize for the inconvenience. Submissions will remain to be judged for the next while, and results will not be finalized until the end of the night. After that, we will move the problems to the main judge. While you wait, please feel free to check out the solutions and test data, which have been posted here: [url=https://woburnchallenge.com/past-contests/]https://woburnchallenge.com/past-contests[/url]. Thank you for your understanding.[/b]

The Woburn Challenge is back for another season! We've awarded thousands of dollars in prizes last year and are excited to do it again this year.

To be eligible for prizes, you [b]must[/b] complete this year's registration form (see [url=http://woburnchallenge.com/register]woburnchallenge.com/register[/url]) [b]even if you have participated last year[/b]. 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.

[b]2018-19 Online Round 1[/b]

[i]When:[/i] [b]Friday, November 16th, 2018 from 3:30 pm to 6:30 pm ET[/b]
[i]Where:[/i] The PEG Judge interface ([url=http://wcipeg.com/contests]wcipeg.com/contests[/url])
[i]Format:[/i] 3 divisions, 3 hours, 4 problems, infinite submissions, and live feedback.
[i]Prizes:[/i]
[list][*] Top 8 Senior division winners: [b]$100, $50, $25, $25, $25, $25, $25, $25[/b]
[*] Top 4 Intermediate division winners: [b]$50, $25, $25, $25[/b][/list]Full format and rules can be found at: [url=http://woburnchallenge.com/contest]woburnchallenge.com/contest[/url]
For more details, visit [url=http://woburnchallenge.com]woburnchallenge.com[/url]. For questions, email [url=mailto:[email protected]][email protected][/url].

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!

The Woburn Challenge 2018 on-site finals was one for the books! We witnessed 25 teams from 13 schools battle it out for the coveted title of Woburn Challenge Champion. In the end, team William Lyon Mackenzie C.I. were victors of the junior division, narrowly inching out team 4 from Churchill Heights P.S. by a time penalty of 10 short minutes. Unfortunately, we were struck by the test data gremlins today. Due to incorrect data for problem J5/S3, Joey Yu and Zixiang Zhou are declared the conjoint champions of the senior division! The corrected version of the problem and data has been copied to the main judge, where in-contest submissions have been rejudged.

The senior division prizewinners are:
[list][*][b]Joey Yu[/b] of Thornhill Secondary School ($250)
[*][b]Zixiang Zhou[/b] of University Heights Public School ($250)
[*][b]Brian Chau[/b] of Woburn Collegiate Institute ($150)[/list]The junior division prizewinners are:[list][*][b]Yi Deng[/b], [b]Evan Zhang[/b], and [b]Jeffrey Gao[/b] of William Lyon Mackenzie Collegiate Institute ($150)
[*][b]Aaron Tang[/b] and [b]Robert Chung[/b] of Churchill Heights Public School ($100)
[*][b]Bill Hu[/b], [b]David Tang[/b], and [b]Andrew Marin[/b] of University of Toronto Schools ($50)[/list]Congratulations! For all online-round prizewinners who could not join us today, we will be getting in contact with your teachers shortly about sending your prizes by mail. We truly hope that you enjoyed tackling all the problems which we have prepared with love. Thanks to all the helping hands that made this event possible, as well as contestants and teachers alike, who stayed with us through to the end of the season. We would love to hear your feedback about how to improve for next year, so please send them to [email protected]. That said, we hope you enjoyed the last round of the season and look forward to bringing you many more exciting challenges next year!

All of the problems have been cloned to the main judge and can be found here: [url=http://wcipeg.com/problem/wc17fj1]J1[/url], [url=http://wcipeg.com/problem/wc17fj2]J2[/url], [url=http://wcipeg.com/problem/wc17fs1]J3/S1[/url], [url=http://wcipeg.com/problem/wc17fs2]J4/S2[/url], [url=http://wcipeg.com/problem/wc17fs3]J5/S3[/url] (corrected!), [url=http://wcipeg.com/problem/wc17fs4]S4[/url], [url=http://wcipeg.com/problem/wc17fs5]S5[/url].
Full results, problems, and solutions are now posted at: [url=http://woburnchallenge.com/past-contests/]woburnchallenge.com/past-contests[/url]

Thank you for joining us in our fourth online round, new and returning participants alike. Our anticipation for the premiere of [i]Avengers: Infinity War[/i] is surpassed only by our anticipation for the finals next month! Problems, solutions, and test data are now posted [url=http://woburnchallenge.com/past-contests/]here[/url].

The senior division prizewinners are:
[list][*][b]Brian Chau[/b] of Woburn Collegiate Institute ($100)
[*][b]Zixiang Zhou[/b] of University Heights Public School ($50) 
[*][b]Alex Xu[/b] of White Oaks Secondary School ($25)
[*][b]Joey Yu[/b] of Thornhill Secondary School ($25)
[*][b]Ava Pun[/b] of Marc Garneau Collegiate Institute ($25)
[*][b]Henning Jiang[/b] of Vincent Massey Secondary School ($25)
[*][b]Sunny Lan[/b] of Richmond Hill High School ($25)
[*][b]Andrew Tang[/b] of Erindale Secondary School ($25)[/list]The intermediate division prizewinners are:
[list][*][b]Michael Huang[/b] of Bell High School ($50) 
[*][b]Aaron Tang[/b] of Churchill Heights Public School ($25)
[*][b]Yi Deng[/b] of William Lyon Mackenzie Collegiate Institute ($25)
[*][b]Evan Zhang[/b] of William Lyon Mackenzie Collegiate Institute ($25)[/list]Finally, a job well done to the top Junior finishers with perfect scores: [b]Henry Guo[/b] of A.Y. Jackson S.S., [b]Michael Sheinman[/b] of Grimsby S.S., [b]Eric Gu[/b] of Glenforest S.S., and [b]Robert Chung[/b] 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.

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

[b]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.[/b]

[b]Problems:[/b] [url=http://wcipeg.com/problem/wc174j1]J1[/url], [url=http://wcipeg.com/problem/wc174j2]J2[/url], [url=http://wcipeg.com/problem/wc174j3]J3/I1[/url], [url=http://wcipeg.com/problem/wc174j4]J4/I2[/url], [url=http://wcipeg.com/problem/wc174s1]I3/S1[/url], [url=http://wcipeg.com/problem/wc174s2]I4/S2[/url], [url=http://wcipeg.com/problem/wc174s3]S3[/url], [url=http://wcipeg.com/problem/wc174s4]S4[/url]

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

To be eligible for prizes, you [b]must[/b] complete this year's registration form (see [url=http://woburnchallenge.com/register]woburnchallenge.com/register[/url]) [b]even if you have participated last year[/b]. 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.

[b]2018 Online Round 4[/b]

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

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!

[b]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.[/b]

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 [url=http://woburnchallenge.com/past-contests/]here[/url].

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

[b]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.[/b]

[b]Problems:[/b] [url=http://wcipeg.com/problem/wc173j1]J1[/url], [url=http://wcipeg.com/problem/wc173j2]J2[/url], [url=http://wcipeg.com/problem/wc173j3]J3/I1[/url], [url=http://wcipeg.com/problem/wc173j4]J4/I2[/url], [url=http://wcipeg.com/problem/wc173s1]I3/S1[/url], [url=http://wcipeg.com/problem/wc173s2]I4/S2[/url], [url=http://wcipeg.com/problem/wc173s3]S3[/url], [url=http://wcipeg.com/problem/wc173s4]S4[/url]

Are you ready for round 3? All newcomers are welcome, so don't miss it!

To be eligible for prizes, you [b]must[/b] complete this year's registration form (see [url=http://woburnchallenge.com/register]woburnchallenge.com/register[/url]) [b]even if you have participated last year[/b]. If you have already completed in rounds 1 or 2, 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.

[b]2018 Online Round 3[/b]

[i]When:[/i] [b]Friday, March 23th, 2018 from 3:30 pm to 6:30 pm ET[/b]
[i]Where:[/i] The PEG Judge interface ([url=http://wcipeg.com/contests]wcipeg.com/contests[/url])
[i]Format:[/i] 3 divisions, 3 hours, 4 problems, infinite submissions, and live feedback.
[i]Prizes:[/i]
[list][*] Top 8 Senior division winners: [b]$100, $50, $25, $25, $25, $25, $25, $25[/b]
[*] Top 4 Intermediate division winners: [b]$50, $25, $25, $25[/b][/list]Full format and rules can be found at: [url=http://woburnchallenge.com/contest]woburnchallenge.com/contest[/url]
For more details, visit [url=http://woburnchallenge.com]woburnchallenge.com[/url]. For questions, email [url=mailto:[email protected]][email protected][/url].

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!

Thank you for joining us in another round, new and returning participants alike! We hope you’re taking notice to the quick ramp-up in difficulty. Problems, solutions, and test data are now posted [url=http://woburnchallenge.com/past-contests/]here[/url].

The senior division prizewinners are:
[list][*][b]Zixiang Zhou[/b] of University Heights Public School ($100) 
[*][b]Brian Chau[/b] of Woburn Collegiate Institute ($50)
[*][b]Royi Luo[/b] of Richmond Hill High School ($25)
[*][b]Andrew Tang[/b] of Erindale Secondary School ($25)
[*][b]William Huang[/b] of Woburn Collegiate Institute ($25) 
[*][b]Evan Yu[/b] of Iroquois Ridge High School ($25) 
[*][b]Henning Jiang[/b] of Vincent Massey Secondary School ($25) 
[*][b]William Fung[/b] of Richmond Hill High School ($25)[/list]The intermediate division prizewinners are:
[list][*][b]Michael Huang[/b] of Bell High School ($50) 
[*][b]Aaron Tang[/b] of Churchill Heights Public School ($25) 
[*][b]Robert Chung[/b] of Churchill Heights Public School ($25) 
[*][b]Alex Xue[/b] of St. Francis Xavier Secondary School ($25)[/list]Finally, we would like to applaud a job well done to the top Junior finishers (all with perfect scores): [b]Anitra Roy[/b] and [b]Robert Chung[/b] of Churchill Heights Public School, and [b]Henry Guo[/b] 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!