Canada at the International Olympiad in Informatics

Overview

The International Olympiad in Informatics (IOI) is one of the most recognized computer science competitions in the world. The competition tasks are algorithmic; however, the contestants must show basic IT skills like problem analysis, design of algorithms and data structures, programming and testing.

Canada at the IOI

Canada's entry into the annual IOI competition is determined by performance on the Canadian Computing Competition. The table below lists Canada's past results.

Contestant	School	City	Medal
Alex Zhiyuan Lin	Tsinghua University High School	Beijing	Bronze
Ryan Bai	InGenius STEAM Education	San Diego, CA	Gold
Tarek Zaki	Al-Hoda International School	Giza	Bronze
Warren Bei	Rockridge S.S.	West Vancouver	Silver

IOI 2025 team - Paul McGrath, Ryan Bai (Gold), Tarek Zaki (Bronze), Warren Bei (Silver), Alex Li (Bronze), Troy Vasiga — From left to right: Paul McGrath, Ryan Bai, Tarek Zaki, Warren Bei, Alex Lin and Troy Vasiga

Contestant	School	City	Medal
Bálint Rózsa	Bloor C.I.	Toronto, ON	Gold
Daniel Ye	William Lyon Mackenzie C.I.	North York, ON	Honourable Mention
Maxwell He	Shanghai H.S. Int'l Division	Shanghai
Ryan Bai	InGenius STEAM Education	San Diego, CA	Gold

IOI 2024 team from Canada - From left to right: J.P. Pretti, Ryan Bai, Bálint Rózsa, Daniel Ye, Maxwell He, Valentina Hideg, and Paul McGrath — From left to right: J.P. Pretti, Ryan Bai, Bálint Rózsa, Daniel Ye, Maxwell He, Valentina Hideg, and Paul McGrath

Contestant	School	City	Medal
Balint Rozsa	Bloor C.I.	Toronto, ON	Silver
Mars Xiang	Crescent School	North York, ON	Bronze
Ryan Bai	Canyon Crest Academy	San Diego, CA	Gold
Warren Bei	Rockridge S. S.	West Vancouver, BC	Silver

IOI 2023 team from Canada. From left to right: Paul McGrath, Mars Xiang, Balint Rozsa, Ryan Bai, Warren Bei, Troy Vasiga, J.P. Pretti — From left to right:
Paul McGrath, Mars Xiang, Balint Rozsa, Ryan Bai, Warren Bei, Troy Vasiga, J.P. Pretti

Contestant	School	City	Medal
Ryan Bai	Canyon Crest Academy	San Diego, CA	Silver
Allen Pei	University of Toronto Schools	Toronto, ON	Silver
Edward Xiao	University of Toronto Schools	Toronto, ON	Bronze
Zixiang Zhou	London Central S. S.	London, ON	Gold

IOI 2022 team from Canada: From left to right: Troy Vasiga, Zixiang Zhou, Ryan Bai, Allen Pei, Edward Xiao, Paul McGrath, and J.P. Pretti — From left to right:
Troy Vasiga, Zixiang Zhou, Ryan Bai, Allen Pei, Edward Xiao, Paul McGrath, and J.P. Pretti

Contestant	School	City	Medal
Thomas Guo	Phillips Exeter Academy	Exeter, NH	Bronze
Allen Pei	University of Toronto Schools	Toronto, ON	Silver
Chris Trevisan	William Lyon Mackenzie C. I.	North York, ON	Silver
Zixiang Zhou	London Central S. S.	London, ON	Gold

IOI 2021 team from Canada: J.P. Pretti, Christopher Trevisan, Allen Pei, Thomas Guo, Zixiang Zhou, and Troy Vasiga — From left to right: J.P. Pretti, Christopher Trevisan, Allen Pei, Thomas Guo, Zixiang Zhou, and Troy Vasiga

Contestant	School	City	Medal
George Chen	Marc Garneau C.I.	North York, ON	Silver
Thomas Guo	Phillips Exeter Academy	Exeter, NH	Gold
Chris Trevisan	William Lyon Mackenzie C. I.	North York, ON	Silver
Zixiang Zhou	London Central S. S.	London, ON	Gold

IOI 2020 team from Canada - J.P. Pretti, Zixiang Zhou, Thomas Guo, Chris Trevisan, George Chen, and Troy Vasiga — From left to right: J.P. Pretti, Zixiang Zhou, Thomas Guo, Chris Trevisan, George Chen, and Troy Vasiga

IOI 2019 - Baku, Azerbaijan

Contestant	School	City	Medal
George Chen	Marc Garneau C.I.	North York, ON	Bronze
Victor Rong	Marc Garneau C.I.	North York, ON	Silver
Kevin Wan	Marc Garneau C.I.	North York, ON
Zixiang Zhou	London Central S. S.	London, ON	Gold

IOI 2019 team from Canada - from left to right: Troy Vasiga, Victor Rong, George Chen, Kevin Wan, Zixiang Zhou, and Carrie Knoll — From left to right: Troy Vasiga, Victor Rong, George Chen, Kevin Wan, Zixiang Zhou, and Carrie Knoll

IOI 2018 - Tsukuba, Japan

Contestant	School	City	Medal
Ava Pun	Marc Garneau C.I.	North York, ON	Silver
Victor Rong	Marc Garneau C.I.	North York, ON	Silver
Joey Yu	Thornhill S.S.	Thornhill, ON	Gold
Zixiang Zhou	University Heights P.S.	London, ON	Silver

IOI 2018 team from Canada - Troy Vasiga, Victor Rong, Zixiang Zhou, Joey Yu, Ava Pun, Carrie Knoll, and J.P. Pretti — From left to right: Troy Vasiga, Victor Rong, Zixiang Zhou, Joey Yu, Ava Pun, Carrie Knoll, and J.P. Pretti

IOI 2017 - Tehran, Iran

Contestant	School	City	Medal
Brian Chau	Woburn C.I.	Scarborough, ON	Gold
Leo Feng	Vincent Massey S.S.	Windsor, ON	Bronze
Joey Yu	Thornhill S.S.	Thornhill, ON
Jason Yuen	Pierre Elliott Trudeau H.S.	Markham, ON	Gold

IOI 2017 team from Canada - Brian Chau, Jason Yuen, Leo Feng and Joey Yu, Troy Vasiga, and J.P. Pretti — From left to right: Brian Chau, Jason Yuen, Leo Feng and Joey Yu, Troy Vasiga, and J.P. Pretti

IOI 2016 - Kazan, Russian Federation

Contestant	School	City	Medal
Timothy Li	Don Mills C.I.	Toronto, ON	Gold
Kevin Sun	Phillips Exeter Academy	Exeter, NH	Silver
Jeffery Xiao	University of Toronto Schools	Toronto, ON	Bronze
Farbod Yadegarian	Northview Heights S.S.	North York, ON	Bronze

IOI 2016 team from Canada - J.P. Pretti, Farbod Yadegarian, Jeffrey Xiao, Kevin Sun, Timothy Li, and Troy Vasiga — From left to right: J.P. Pretti, Farbod Yadegarian, Jeffrey Xiao, Kevin Sun, Timothy Li, and Troy Vasiga

IOI 2015 - Almaty, Kazakhstan

Contestant	School	City	Medal
Jacob Jackson	University of Toronto Schools	Toronto, ON	Gold
Timothy Li	Don Mills C.I.	Toronto, ON	Silver
Farbod Yadegarian	Northview Heights S.S.	North York, ON	Bronze
Ben Zhang	Woburn C.I.	Toronto, ON	Bronze

IOI 2015 team from Canada - J.P. Pretti, Ben Zhang, Farbod Yadegarian, Jacob Jackson, Timothy Li, and Troy Vasiga — From left to right: J.P. Pretti, Ben Zhang, Farbod Yadegarian, Jacob Jackson, Timothy Li, and Troy Vasiga

IOI 2014 - Taipei, Taiwan

Contestant	School	City	Medal
Jacob Jackson	University of Toronto Schools	Toronto, ON	Gold
Timothy Li	Don Mills C.I.	Toronto, ON	Bronze
Ben Zhang	Woburn C.I.	Toronto, ON
Zihao Zhang	Vincent Massey S.S.	Windsor, ON	Bronze

IOI 2014 team from Canada - J.P. Pretti, Timothy Li, Zihao Zhang, Jacob Jackson, Ben Zhang, and Troy Vasiga — From left to right: J.P. Pretti, Timothy Li, Zihao Zhang, Jacob Jackson, Ben Zhang, and Troy Vasiga

IOI 2013 - Brisbane, Australia

Contestant	School	City	Medal
Calvin Deng	North Carolina School of Science & Math	Durham, NC	Silver
Andy Huang	Milliken Mills H.S.	Markham, ON	Bronze
Angus Kong	Vincent Massey S.S.	Windsor, ON
Yuanhao Wei	Earl of March S.S.	Kanata, ON	Bronze

IOI 2013 team from Canada - Troy Vasiga, Calvin Deng, Andy Huang, Angus Kong, Yuanhao Wei, and J.P. Pretti — From left to right: Troy Vasiga, Calvin Deng, Andy Huang, Angus Kong, Yuanhao Wei, and J.P. Pretti

IOI 2012 - Sirmione - Montichari, Italy

Contestant	School	City	Medal
Vitalik Buterin	The Abelard School	Toronto, ON	Bronze
Daniel Hui	Woburn C.I.	Toronto, ON	Silver
Angus Kong	Vincent Massey S.S.	Windsor, ON
Geoffry Song	Lisgar C.I.	Ottawa, ON	Silver

IOI 2012 team from Canada - Troy Vasiga, Geoffry Song, Angus Kong, Vitalik Buterin, Daniel Hui, and J.P. Pretti — From left to right: Troy Vasiga, Geoffry Song, Angus Kong, Vitalik Buterin, Daniel Hui, and J.P. Pretti

IOI 2011 - Pattaya, Thailand

Contestant	School	City	Medal
Daniel Hui	Woburn C.I.	Toronto, ON	Bronze
Kevin Yeo	William Lyon Mackenzie C.I.	North York, ON	Bronze
Ziting (Darin) Yu	L'Amoreaux C.I.	Scarborough, ON	Silver
Cyril Zhang	Don Mills C.I.	Toronto, ON	Bronze

IOI 2011 team from Canada - Troy Vasiga, J.P. Pretti, Daniel Hui, Darin Yu, Kevin Yeo, Cyril Zhang and Ian Munro — From left to right: Troy Vasiga, J.P. Pretti, Daniel Hui, Darin Yu, Kevin Yeo, Cyril Zhang and Ian Munro

IOI 2010 - Waterloo, Canada

Contestant	School	City	Medal
Brian Bi	Woburn C.I.	Toronto, ON	Silver
Robin Cheng	Pinetree S. S.	Coquitlam, BC	Gold
Zhi Qiang Lui	Don Mills C.I.	Toronto, ON	Bronze
Jacob Plachta	Woburn C.I.	Toronto, ON	Bronze
Unofficial second team (allowed for host country)
Tyson Andre	Richmond Hill H.S.	Toronto, ON
Aurick Qiao	Vincent Massey S.S.	Windsor, ON
Cyril Zhang	Don Mills C.I.	Toronto, ON
Jonathan Zung	University of Toronto Schools	Toronto, ON

IOI 2010 team from Canada - 2010 IOI Team (From left to right): Front row: Jonathan Zung, Aurick Qiao, Robin Cheng, Brian Bi Back row: Zhi Qiang Liu, Jacob Plachta, Cyril Zhang, and Tyson Andre — From left to right:
Front row: Jonathan Zung, Aurick Qiao, Robin Cheng, Brian Bi
Back row: Zhi Qiang Liu, Jacob Plachta, Cyril Zhang, and Tyson Andre

IOI 2009 - Plovdiv, Bulgaria

Contestant	School	City	Medal
Brian Bi	Woburn C.I.	Toronto, ON	Silver
Robin Cheng	Pinetree S. S.	Coquitlam, BC	Silver
Hanson Wang	Woburn C.I.	Toronto, ON	Gold
Peter Wen	Vincent Massey S.S.	Windsor, ON	Bronze

IOI 2009 team from Canada - (From left to right): Front row: Terry Bae, Peter Wen, Robin Cheng, Hanson Wang, Brian Bi Back row: Graeme Kemkes, Ivan (IOI Guide), Richard Peng, Ian Munro, and Troy Vasiga — From left to right:
Front row: Terry Bae, Peter Wen, Robin Cheng, Hanson Wang, Brian Bi
Back row: Graeme Kemkes, Ivan (IOI Guide), Richard Peng, Ian Munro, and Troy Vasiga

IOI 2008 - Cairo, Egypt

Contestant	School	City	Medal
Robin Cheng	Pinetree S. S.	Coquitlam, BC	Bronze
Tom Szymanski	Vincent Massey S.S.	Windsor, ON
Aaron Voelker	Bell H.S.	Stittsville, ON	Bronze
Hanson Wang	Woburn C.I.	Toronto, ON	Gold

IOI 2008 team from Canada: Aaron Voelker, Graeme Kemkes, Tom Szymanski, Robin Cheng, Ian Munro, and Hanson Wang — From left to right: Aaron Voelker, Graeme Kemkes, Tom Szymanski, Robin Cheng, Ian Munro, and Hanson Wang

IOI 2007 - Zagreb, Croatia

Contestant	School	City	Medal
Guru Guruganesh	Woburn C.I.	Toronto, ON
Andy Kong	Vincent Massey S.S.	Windsor, ON	Bronze
Konstantin Lopyrev	Richmond Hill H.S.	Richmond Hill, ON	Bronze
Ricky Ngan	Thornhill S.S.	Thornhill, ON

IOI 2007 team from Canada: Ricky Ngan, Troy Vasiga, Andy Kong, Ian Munro, Guru Guruganesh, Konstantin Lopyrev, Graeme Kemkes, and Gordon Cormack — From left to right:
Ricky Ngan, Troy Vasiga, Andy Kong, Ian Munro, Guru Guruganesh, Konstantin Lopyrev, Graeme Kemkes, and Gordon Cormack

IOI 2006 - Merida, Mexico

Contestant	School	City	Medal
Andy Kong	Vincent Massey S.S.	Windsor, ON	Silver
Richard (Yang) Peng	Vaughan Road Academy	Toronto, ON	Silver
Peng Shi	Sir John A. MacDonald	Agincourt, ON	Silver
Qiyu Zhu	A. Y. Jackson	North York, ON	Bronze

IOI 2006 team from Canada: Peng Shi, Qiyu Zhu, Gordon Cormack, Andy Kong, Graeme Kemkes, Richard Peng (with mascot), Ian Munro, and Troy Vasiga — From left to right: Peng Shi, Qiyu Zhu, Gordon Cormack, Andy Kong, Graeme Kemkes, Richard Peng (with mascot), Ian Munro, and Troy Vasiga

IOI 2005 - Nowy Sacz, Poland

Contestant	School	City	Medal
Aidin Kashigar	Sir Frederick Banting S.S.	London, ON	Bronze
Simon Parent	Kitchener-Waterloo C.I. & V.I.	Kitchener, ON	Silver
Richard (Yang) Peng	Vaughan Road Academy	Toronto, ON	Gold
Qiyu Zhu	A. Y. Jackson	North York, ON	Bronze

IOI 2005 team from Canada: Gordon Cormack (with mascot), Richard Peng, Simon Parent, IOI Guide, Aidin Kashigar, Qiyu Zhu, Graeme Kemkes, and Ian Munro — From left to right: Gordon Cormack (with mascot), Richard Peng, Simon Parent, IOI Guide, Aidin Kashigar, Qiyu Zhu, Graeme Kemkes, and Ian Munro

IOI 2004 - Athens, Greece

Contestant	School	City	Medal
Aidin Kashigar	Sir Frederick Banting S.S.	London, ON	Bronze
Simon Parent	Kitchener-Waterloo C.I. & V.I.	Kitchener, ON	Bronze
Richard (Yang) Peng	Vaughan Road Academy	Toronto, ON	Silver
Vishvajit Singh	Markville S.S.	Markham, ON	Bronze

IOI 2004 team from Canada - Graeme Kemkes, Troy Vasiga, Aidin Kashigar, Simon Parent, Vishvajit Singh, Richard Peng, and Gordon Cormack — From left to right: Graeme Kemkes, Troy Vasiga, Aidin Kashigar, Simon Parent, Vishvajit Singh, Richard Peng, and Gordon Cormack

IOI 2003 - University of Wisconsin (Parkside), USA

Contestant	School	City	Medal
Sean Henderson	Woburn C.I.	Toronto, ON
Geoff Lywood	Archbishop Macdonald H.S.	Edmonton, AB
Simon Parent	Kitchener-Waterloo C.I. & V.I.	Kitchener, ON	Silver
Matei Zaharia	Jarvis C.I.	Toronto, ON	Silver

IOI 2003 team from Canada: Geoff Lywood, Matei Zaharia, Sean Henderson, and Simon Parent — From left to right: Geoff Lywood, Matei Zaharia, Sean Henderson, and Simon Parent

IOI 2002 - Yong-In, Korean Republic

Contestant	School	City	Medal
Marcin Mika	Father Michael Goetz S.S.	Missisauga, ON	Bronze
Jason Thean	Woburn C.I.	Toronto, ON
Matei Zaharia	Jarvis C.I.	Toronto, ON	Silver
David Zhang	Woburn C.I.	Toronto, ON	Silver

IOI 2002 team from Canada - Jason Thean, David Zhang, Marcin Mika, and Matei Zaharia — From left to right: Jason Thean, David Zhang, Marcin Mika, and Matei Zaharia

IOI 2001 - Tampere, Finland

Contestant	School	City	Medal
Marcin Mika	Father Michael Goetz S.S.	Missisauga, ON
Thomas Ootjers	East Northumberland S.S.	Brighton, ON
William Slofstra	Elmira D.S.S.	Elmira, ON
David Zhang	Woburn C.I.	Toronto, ON	Gold

IOI 2001 team from Canada - Barry Ferguson, David Zhang, William Slofstra, Marcin Mika, Gordon Cormack, IOI Guide, and Thomas Ootjers — From left to right: Barry Ferguson, David Zhang, William Slofstra, Marcin Mika, Gordon Cormack, IOI Guide, and Thomas Ootjers

IOI 2000 - Beijing, China

Contestant	School	City	Medal
David Arthur	Upper Canada College	Toronto, ON	Gold
Denis Dmitriev	Centennial Senior S.S.	Coquitlam, B.C.	Silver
Jonathan Gilbert	Vincent Massey C.I.	Winnipeg, MB	Bronze
David Pritchard	Woburn C.I.	Toronto, ON	Gold

IOI 2000 team from Canada - Denis Dmitriev, David Arthur, David Pritchard, and Jonathan Gilbert — From left to right: Denis Dmitriev, David Arthur, David Pritchard, and Jonathan Gilbert

IOI 1999 - Antalya-Belek, Turkey

Contestant	School	City	Medal
David Arthur	Upper Canada College	Toronto, ON	Gold
Bryan Chan	Lisgar C.I.	Ottawa, ON
Eugene Osovetsky	W.Lyon Mackenzie C.I.	North York, ON	Bronze
David Pritchard	Woburn C.I.	Toronto, ON	Silver

IOI 1999 team from Canada - Anisoara Nica (Sybase Representative), Bryan Chan, David Arthur, David Pritchard, Eugene Osovetsky, and Barry Ferguson (Leader) — From left to right: Anisoara Nica (Sybase Representative), Bryan Chan, David Arthur, David Pritchard, Eugene Osovetsky, and Barry Ferguson (Leader).

IOI 1998 - Setubal, Portugal

Contestant	School	City	Medal
David Arthur	Upper Canada College	Toronto, ON	Bronze
Neil Girdhar	Woburn C.I.	Toronto, ON	Bronze
Graeme Kemkes	Glenview Park S.S.	Cambridge, ON
David Pritchard	Woburn C.I.	Toronto, ON	Silver

IOI 1998 team from Canada - Barry Ferguson (Leader), Graeme Kemkes, Neil Girdhar, David Arthur, David Pritchard, and Michelle Debeyer (Sybase Representative) — From left to right: Barry Ferguson (Leader), Graeme Kemkes, Neil Girdhar, David Arthur, David Pritchard, and Michelle Debeyer (Sybase Representative)

IOI 1997 - Cape Town, South Africa

Contestant	School	City	Medal
Neil Girdhar	Woburn C.I.	Toronto, ON	Bronze
Graeme Kemkes	Glenview Park S.S.	Cambridge, ON	Bronze
Peter Ruderman	Turner Fenton S.S.	Brampton, ON	Silver
Darryl Shpak	Immanuel Christian School	Winnipeg, MB	Bronze

IOI 1997 team from Canada - Neil Girdhar, Darryl Shpak, Peter Ruderman, and Graeme Kemkes — From left to right: Neil Girdhar, Darryl Shpak, Peter Ruderman, and Graeme Kemkes

IOI 1996 - Veszprem, Hungary

Contestant	School	City	Medal
Donny Cheung	St. John's-Ravenscourt School	Winnipeg, MB	Bronze
Alan Martin	Gloucester High School	Gloucester, ON	Silver
David Pritchard	Danforth C.I.	Toronto, ON
Darryl Shpak	Immanuel Christian School	Winnipeg, MB	Bronze

IOI 1996 team from Canada - Barry Ferguson, Alan Martin, Donny Cheung, Darryl Shpak, David Pritchard, and Richard Clausi — From left to right: Barry Ferguson, Alan Martin, Donny Cheung, Darryl Shpak, David Pritchard, and Richard Clausi