International Olympiad in Informatics: Difference between revisions

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[[File:IOI Zagreb 1.JPG|thumb|In front of the competition room at the IOI 2007]]
[[File:IOI Zagreb 1.JPG|thumb|In front of the competition room at the IOI 2007]]


On each of the two competition days, the competitors are typically given three problems which they have to solve in five hours. Each student works on their own to solve the problems with no outside help, specifically no communication with other contestants, books, web access, etc. Contestants are typically allowed to bring non-programable wired keyboards and mice.<ref>{{cite web |title=Competition Equipment |url=https://www.ioi2024.eg/competition-equipment |website=IOI 2024 Egypt |publisher=Arab Academy |access-date=29 July 2024}}</ref> Usually to solve a task the contestant has to write a computer program (in [[C++]]) and submit it before the five-hour competition time ends. The program is graded based on secret test data. Since IOI 2010, tasks are divided into subtasks with graduated difficulty, and points are awarded only when all tests for a particular subtask yield correct results, within specific time and memory limits. In some cases, the contestant's program has to interact with a secret computer library, which allows problems where the input is not fixed, but depends on the program's actions – for example in game problems (a.k.a interactive problems). Another type of problem has the inputs publicly available, for these, the contestants have to submit an output file instead of a program, and it is up to them whether they obtain the output files by writing a program (possibly exploiting special characteristics of the input), or by hand, or by a combination of these means. Pascal has been removed as an available programming language as of 2019.<ref name="minutes16">{{cite web|title=Minutes of the Meetings held in Kazan, Russian Federation|url=https://www.ioinformatics.org/files/ioi2016minutes.pdf|website=ioinformatics.org|publisher=General Assembly of International Olympiad in Informatics|pages=7, 11|date=19 August 2016}}</ref><sup>:11</sup>
On each of the two competition days, the competitors are typically given three problems which they have to solve in five hours. Each student works on their own to solve the problems with no outside help, specifically no communication with other contestants, books, web access, etc. Contestants are typically allowed to bring non-programmable wired keyboards and mice.<ref>{{cite web |title=Competition Equipment |url=https://www.ioi2024.eg/competition-equipment |website=IOI 2024 Egypt |publisher=Arab Academy |access-date=29 July 2024}}</ref> Usually to solve a task the contestant has to write a computer program (in [[C++]]) and submit it before the five-hour competition time ends. The program is graded based on secret test data. Since IOI 2010, tasks are divided into subtasks with graduated difficulty, and points are awarded only when all tests for a particular subtask yield correct results, within specific time and memory limits. In some cases, the contestant's program has to interact with a secret computer library, which allows problems where the input is not fixed, but depends on the program's actions – for example in game problems (a.k.a. interactive problems). Another type of problem has the inputs publicly available, for these, the contestants have to submit an output file instead of a program, and it is up to them whether they obtain the output files by writing a program (possibly exploiting special characteristics of the input), or by hand, or by a combination of these means. Pascal has been removed as an available programming language as of 2019.<ref name="minutes16">{{cite web|title=Minutes of the Meetings held in Kazan, Russian Federation|url=https://www.ioinformatics.org/files/ioi2016minutes.pdf|website=ioinformatics.org|publisher=General Assembly of International Olympiad in Informatics|pages=7, 11|date=19 August 2016}}</ref><sup>:11</sup>


IOI 2010 for the first time had a live web scoreboard with real-time provisional results.  Submissions will be scored as soon as possible during the contest, and the results posted. Contestants will be aware of their scores, but not others', and may resubmit to improve their scores. Starting from 2012, IOI has been using the Contest Management System (CMS) for developing and monitoring the contest.<ref>{{cite web |title=IOI 2010 Waterloo |url=https://www.ioi2010.org/ |website=IOI 2010 Waterloo |publisher=University of Waterloo |access-date=29 July 2024}}</ref>
IOI 2010 for the first time had a live web scoreboard with real-time provisional results.  Submissions will be scored as soon as possible during the contest, and the results posted. Contestants will be aware of their scores, but not others', and may resubmit to improve their scores. Starting from 2012, IOI has been using the Contest Management System (CMS) for developing and monitoring the contest.<ref>{{cite web |title=IOI 2010 Waterloo |url=https://www.ioi2010.org/ |website=IOI 2010 Waterloo |publisher=University of Waterloo |access-date=29 July 2024}}</ref>
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Prior to IOI 2010, students who did not receive medals did not have their scores published, although the scores of students who did not receive medals are still not available in the official results, they are known from the live web scoreboard. In IOI 2012 the top 3 nations ranked by aggregate score (Russia, China and USA) were subsequently awarded during the closing ceremony.
Prior to IOI 2010, students who did not receive medals did not have their scores published, although the scores of students who did not receive medals are still not available in the official results, they are known from the live web scoreboard. In IOI 2012 the top 3 nations ranked by aggregate score (Russia, China and USA) were subsequently awarded during the closing ceremony.


Analysis of female performance shows 77.9% of women obtain no medal, while 49.2% of men obtain no medal. "The average female participation was 4.4% in 1989–1994 and 2.2% in 1996–2014." It also suggests much higher participation of women on the national level, claiming sometimes double-digit percentages in total participation on the first stage.<ref>{{cite journal|last1=Maggiolo|first1=Stefano|title=An Update on the Female Presence at the IOI|journal=Olympiads in Informatics|volume=9, 127–137|issue=2015|pages=127–137|doi=10.15388/ioi.2015.10|url=http://ioinformatics.org/oi/pdf/v9_2015_127_137.pdf|access-date=13 July 2017|publisher=ioinformatics.org|location=London, U.K.|year=2015|doi-access=free}}</ref> President of the IOI (2011-2014), Richard Forster, says the competition has difficulty attracting women and that in spite of trying to solve it, "none of us have hit on quite what the problem is, let alone the solution."<ref name="Robson" /> The European Girls’ Olympiad in Informatics ([[EGOI]]), which was first held in 2021 was started with the goal to increscent female participants at IOI and other Informatics Olympiads.<ref>{{cite web |title=European Girls’ Olympiad in Informatics |url=https://egoi.org/ |website=European Girls’ Olympiad in Informatics |publisher=European Girls’ Olympiad in Informatics}}</ref>
Analysis of female performance shows 77.9% of women obtain no medal, while 49.2% of men obtain no medal. "The average female participation was 4.4% in 1989–1994 and 2.2% in 1996–2014." It also suggests much higher participation of women on the national level, claiming sometimes double-digit percentages in total participation on the first stage.<ref>{{cite journal|last1=Maggiolo|first1=Stefano|title=An Update on the Female Presence at the IOI|journal=Olympiads in Informatics|volume=9, 127–137|issue=2015|pages=127–137|doi=10.15388/ioi.2015.10|url=http://ioinformatics.org/oi/pdf/v9_2015_127_137.pdf|access-date=13 July 2017|publisher=ioinformatics.org|location=London, U.K.|year=2015|doi-access=free}}</ref> President of the IOI (2011-2014), Richard Forster, says the competition has difficulty attracting women and that in spite of trying to solve it, "none of us have hit on quite what the problem is, let alone the solution."<ref name="Robson" /> The European Girls’ Olympiad in Informatics ([[EGOI]]), which was first held in 2021 was started with the goal to increscent female participants at IOI and other Informatics Olympiads.<ref>{{cite web |title=European Girls' Olympiad in Informatics |url=https://egoi.org/ |website=European Girls’ Olympiad in Informatics }}</ref>


In IOI 2017 held in Iran, due to not being able to participate in Iran, the Israeli students participated in an offsite competition organized by IOI in Russia.<ref name="minutes16" /><sup>:11</sup> Due to visa issues, the full USA team was unable to attend, although one contestant Zhezheng Luo<ref>{{cite web|url=http://stats.ioinformatics.org/people/6410|title=Zhezheng Luo|website=stats.ioinformatics.org}}</ref> was able to attend by traveling with the Chinese team<ref>{{cite web|last1=Simões|first1=Gabriel|title=IOI 2017, first round - Codeforces|url=http://codeforces.com/blog/entry/53550#comment-375744|website=Codeforces|access-date=4 August 2017|date=31 July 2017|quote=There is really only one USA contestant on site, it looks like he came with the Chinese team (straight from China).}}</ref> and winning gold medal and 3rd place in standings.<ref name="standings2017">{{cite web|url=http://stats.ioinformatics.org/results/2017|title=IOI 2017: Results|website=stats.ioinformatics.org}}</ref>
In IOI 2017 held in Iran, due to not being able to participate in Iran, the Israeli students participated in an offsite competition organized by IOI in Russia.<ref name="minutes16" /><sup>:11</sup> Due to visa issues, the full USA team was unable to attend, although one contestant Zhezheng Luo<ref>{{cite web|url=http://stats.ioinformatics.org/people/6410|title=Zhezheng Luo|website=stats.ioinformatics.org}}</ref> was able to attend by traveling with the Chinese team<ref>{{cite web|last1=Simões|first1=Gabriel|title=IOI 2017, first round - Codeforces|url=http://codeforces.com/blog/entry/53550#comment-375744|website=Codeforces|access-date=4 August 2017|date=31 July 2017|quote=There is really only one USA contestant on site, it looks like he came with the Chinese team (straight from China).}}</ref> and winning gold medal and 3rd place in standings.<ref name="standings2017">{{cite web|url=http://stats.ioinformatics.org/results/2017|title=IOI 2017: Results|website=stats.ioinformatics.org}}</ref>
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Due to the [[COVID-19 pandemic]], both the IOI 2020 and IOI 2021, originally scheduled to be hosted by [[Singapore]], were held as online contests. The IOI 2022, hosted by [[Indonesia]], was held as a hybrid event, with around 25% of the contestants participating online.<ref>{{cite web|url=https://ioi2022.id/number-of-participants/|title=Number of Participants|website=ioi2022.id}}</ref>
Due to the [[COVID-19 pandemic]], both the IOI 2020 and IOI 2021, originally scheduled to be hosted by [[Singapore]], were held as online contests. The IOI 2022, hosted by [[Indonesia]], was held as a hybrid event, with around 25% of the contestants participating online.<ref>{{cite web|url=https://ioi2022.id/number-of-participants/|title=Number of Participants|website=ioi2022.id}}</ref>


In response to the invasion of Ukraine, students from Russia and Belarus can only participate as individuals under the IOI flag but not as national delegations starting from IOI 2022, and they would only participate online for IOI 2022, but they may return on-site from IOI 2023 onwards.<ref>{{cite web|url=https://ioinformatics.org/news/ioi-response-to-invasion-of-ukraine/40|title=IOI response to invasion of Ukraine|website= International Olympiad in Informatics| date=March 12, 2022|access-date=September 28, 2024}}</ref>
In response to the invasion of Ukraine, students from Russia and Belarus can only participate as individuals under the IOI flag but not as national delegations starting from IOI 2022, and they would only participate online for IOI 2022.<ref>{{cite web|url=https://ioinformatics.org/news/ioi-response-to-invasion-of-ukraine/40|title=IOI response to invasion of Ukraine|website= International Olympiad in Informatics| date=March 12, 2022|access-date=September 28, 2024}}</ref> From 2023 onwards they would participate in person, but under the IOI flag.


In response to the conflict and humanitarian crisis in Gaza, students from Israel can only participate as individuals under the IOI flag but not as a national delegation from IOI 2025 onwards. Over two thirds of the delegations voted in favour of the sanction in the IOI General Assembly.<ref>{{cite web|url=https://ioinformatics.org/news/ioi-response-to-the-conflict-in-gaza/52|title=IOI response to the conflict in Gaza|website= International Olympiad in Informatics| date=September 24, 2024|access-date=September 28, 2024}}</ref>
In response to the conflict and humanitarian crisis in Gaza, students from Israel can only participate as individuals under the IOI flag but not as a national delegation from IOI 2025 onwards. Over two thirds of the delegations voted in favour of the sanction in the IOI General Assembly.<ref>{{cite web|url=https://ioinformatics.org/news/ioi-response-to-the-conflict-in-gaza/52|title=IOI response to the conflict in Gaza|website= International Olympiad in Informatics| date=September 24, 2024|access-date=September 28, 2024}}</ref>


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== Members ==
== Members ==
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{| class="wikitable"
{| class="wikitable"
|-
|-
! Number !! Year !! Dates !! Host country !! Host city !! Results !! Website  
! Number !! Year !! Dates !! Host country !! Host city  
!Absolute Winner
!Score!! Results !! Website  
|-
|-
|1 || 1989 || May 16–19 || {{flagicon|Bulgaria|1971}} [[People's Republic of Bulgaria|Bulgaria]] || [[Pravets|Pravetz]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1989|title=IOI 1989 Results}}</ref> ||
|1 || 1989 || May 16–19 || {{flagicon|Bulgaria|1971}} [[People's Republic of Bulgaria|Bulgaria]] || [[Pravets|Pravetz]]  
|Teodor Tonchev (Bulgaria)
|100/100|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1989|title=IOI 1989 Results}}</ref> ||
|-
|-
| 2 || 1990 || July 15–21 || {{flagicon|Byelorussian SSR}} [[Belarusian SSR|Belarus]], [[Soviet Union]] || [[Minsk]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1990|title=IOI 1990 Results}}</ref> ||
| 2 || 1990 || July 15–21 || {{flagicon|Byelorussian SSR}} [[Belarusian SSR|Belarus]], [[Soviet Union]] || [[Minsk]]  
|Tsvetomir Petrov (Bulgaria)
|160/200|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1990|title=IOI 1990 Results}}</ref> ||
|-
|-
| 3 || 1991 || May 19–25 || {{flagicon|Greece}} [[Greece]] || [[Athens]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1991|title=IOI 1991 Results}}</ref> ||
| 3 || 1991 || May 19–25 || {{flagicon|Greece}} [[Greece]] || [[Athens]]  
|Igor Maly (Czechoslovakia)
|196/200|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1991|title=IOI 1991 Results}}</ref> ||
|-
|-
| 4 || 1992 || July 11–21 || {{flagicon|DEU}} [[Germany]] || [[Bonn]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1992|title=IOI 1992 Results}}</ref>||
| 4 || 1992 || July 11–21 || {{flagicon|DEU}} [[Germany]] || [[Bonn]]  
|Bom Jun Kim (Republic of Korea), Fredrik Huss (Sweden), Gao Chen (China), Jittat Fakcharoenphol (Thailand), Laszlo Peter (Hungary), Matej Ondrusek (Czechoslovakia), Nathan Bronson (United States of America), Pinit Asavanuchit (Thailand), Shawn Smith (United States of America), Viet Nguyen Tuan (Vietnam), Xing Wu (China), Yunhe Yang (China), Niklas Eén (Sweden)
|200/200|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1992|title=IOI 1992 Results}}</ref>||
|-
|-
| 5 || 1993 || October 16–25 || {{flagicon|ARG}} [[Argentina]] || [[Mendoza, Argentina|Mendoza]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1993|title=IOI 1993 Results}}</ref> || <ref>{{cite web|url=http://www.ioi.org.ar/mendoza/|title=IOI 1993 Website|website=ioi1993|access-date=2024-03-07|archive-date=1999-02-24|archive-url=https://web.archive.org/web/19990224113008/http://www.ioi.org.ar/mendoza/|url-status=dead}}</ref>
| 5 || 1993 || October 16–25 || {{flagicon|ARG}} [[Argentina]] || [[Mendoza, Argentina|Mendoza]]  
|Fredrik Huss (Sweden), Martin Mareš (Czech Republic), Mehdi Foladgar (Iran), Radu-Lucian Lupsa (Romania)
|200/200|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1993|title=IOI 1993 Results}}</ref> || <ref>{{cite web|url=http://www.ioi.org.ar/mendoza/|title=IOI 1993 Website|website=ioi1993|access-date=2024-03-07|archive-date=1999-02-24|archive-url=https://web.archive.org/web/19990224113008/http://www.ioi.org.ar/mendoza/|url-status=dead}}</ref>
|-
|-
|6 || 1994 || July 3–10 || {{flagicon|Sweden}} [[Sweden]] || [[Haninge]]  || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1994|title=IOI 1994 Results}}</ref> || <ref>{{cite web|url=http://www.haninge.kth.se/IOI/ioi.html|title=IOI 1994 Website|website=ioi1994|access-date=2024-03-07|archive-date=1997-01-02|archive-url=https://web.archive.org/web/19970102155956/http://www.haninge.kth.se/IOI/ioi.html|url-status=bot: unknown}}</ref>
|6 || 1994 || July 3–10 || {{flagicon|Sweden}} [[Sweden]] || [[Haninge]]   
|Victor Bargatchev (Russia)
|195/200|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1994|title=IOI 1994 Results}}</ref> || <ref>{{cite web|url=http://www.haninge.kth.se/IOI/ioi.html|title=IOI 1994 Website|website=ioi1994|access-date=2024-03-07|archive-date=1997-01-02|archive-url=https://web.archive.org/web/19970102155956/http://www.haninge.kth.se/IOI/ioi.html|url-status=bot: unknown}}</ref>
|-
|-
| 7 || 1995 || June 26 – July 3 || {{flagicon|NED}} [[Netherlands]] || [[Eindhoven]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1995|title=IOI 1995 Results}}</ref> ||
| 7 || 1995 || June 26 – July 3 || {{flagicon|NED}} [[Netherlands]] || [[Eindhoven]]  
|Victor Bargatchev (Russia)
|186/200|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1995|title=IOI 1995 Results}}</ref> ||
|-
|-
| 8 || 1996 || July 25 – August 2 || {{flagicon|Hungary}} [[Hungary]] || [[Veszprém]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1996|title=IOI 1996 Results}}</ref> ||
| 8 || 1996 || July 25 – August 2 || {{flagicon|Hungary}} [[Hungary]] || [[Veszprém]]  
|Daniel Kráľ (Czech Republic)
|196/200|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1996|title=IOI 1996 Results}}</ref> ||
|-
|-
| 9 || 1997 || November 30 – December 7 || {{flagicon|RSA}} [[South Africa]] || [[Cape Town]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1997|title=IOI 1997 Results}}</ref> ||
| 9 || 1997 || November 30 – December 7 || {{flagicon|RSA}} [[South Africa]] || [[Cape Town]]  
|Vladimir Martianov (Russia)
|462/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1997|title=IOI 1997 Results}}</ref> ||
|-
|-
| 10 || 1998 || September 5–12 || {{flagicon|Portugal}} [[Portugal]] || [[Setúbal]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1998|title=IOI 1998 Results}}</ref>||
| 10 || 1998 || September 5–12 || {{flagicon|Portugal}} [[Portugal]] || [[Setúbal]]  
|Daniel Wright (South Africa), Mihai Stroe (Romania), Vladimir Martianov (Russia), Zhunping Zhang (China)
|700/700|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1998|title=IOI 1998 Results}}</ref>||
|-
|-
| 11 || 1999 || October 9–16 || {{flagicon|Turkey}} [[Turkey]] || [[Antalya]]-[[Belek]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/1999|title=IOI 1999 Results}}</ref> ||
| 11 || 1999 || October 9–16 || {{flagicon|Turkey}} [[Turkey]] || [[Antalya]]-[[Belek]]  
|Hong Chen (China)
|480/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/1999|title=IOI 1999 Results}}</ref> ||
|-
|-
| 12 || 2000 || September 23–30 || {{flagicon|CHN}} [[People's Republic of China|China]] || [[Beijing]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2000|title=IOI 2000 Results}}</ref> ||
| 12 || 2000 || September 23–30 || {{flagicon|CHN}} [[China]] || [[Beijing]]  
|Mikhail Baoutine (Russia)
|700/700|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2000|title=IOI 2000 Results}}</ref> ||
|-
|-
| 13 || 2001 || July 14–21 || {{flagicon|FIN}} [[Finland]] || [[Tampere]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2001|title=IOI 2001 Results}}</ref> ||
| 13 || 2001 || July 14–21 || {{flagicon|FIN}} [[Finland]] || [[Tampere]]  
|Reid Barton (United States of America)
|580/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2001|title=IOI 2001 Results}}</ref> ||
|-
|-
| 14 || 2002 || August 18–25 || {{flagicon|KOR}} [[Republic of Korea|Korea Rep.]] || [[Yongin|Yong-In]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2002|title=IOI 2002 Results}}</ref> ||
| 14 || 2002 || August 18–25 || {{flagicon|KOR}} [[Republic of Korea|Korea Rep.]] || [[Yongin|Yong-In]]  
|Wan Yeong Jung (Republic of Korea)
|510/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2002|title=IOI 2002 Results}}</ref> ||
|-
|-
| 15 || 2003 || August 16–23 || {{flagicon|USA}} [[United States]] || [[Kenosha, Wisconsin]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2003|title=IOI 2003 Results}}</ref>||
| 15 || 2003 || August 16–23 || {{flagicon|USA}} [[United States]] || [[Kenosha, Wisconsin]]  
|Hwan-Seung Yeo (Republic of Korea)
|455.4/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2003|title=IOI 2003 Results}}</ref>||
|-
|-
| 16 || 2004 || September 11–18 || {{flagicon|Greece}} [[Greece]] || [[Athens]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2004|title=IOI 2004 Results}}</ref> ||
| 16 || 2004 || September 11–18 || {{flagicon|Greece}} [[Greece]] || [[Athens]]  
|Paul Jefferys (United Kingdom)
|565/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2004|title=IOI 2004 Results}}</ref> ||
|-
|-
| 17 || 2005 || August 18–25 || {{flagicon|POL}} [[Poland]] || [[Nowy Sącz]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2005|title=IOI 2005 Results}}</ref> || <ref>{{cite web|url=https://www.oi.edu.pl/old/ioi/|title=IOI 2005 Website|website=ioi2005}}</ref>
| 17 || 2005 || August 18–25 || {{flagicon|POL}} [[Poland]] || [[Nowy Sącz]]  
|Eric Price (United States of America), Weidong Hu (China), Yuan Zhou (China), Yuriy Znovyak (Ukraine)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2005|title=IOI 2005 Results}}</ref> || <ref>{{cite web|url=https://www.oi.edu.pl/old/ioi/|title=IOI 2005 Website|website=ioi2005}}</ref>
|-
|-
| 18 || 2006 || August 13–20 || {{flagicon|MEX}} [[Mexico]] || [[Mérida, Yucatán|Mérida]], [[Yucatán]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2006|title=IOI 2006 Results}}</ref> ||
| 18 || 2006 || August 13–20 || {{flagicon|MEX}} [[Mexico]] || [[Mérida, Yucatán|Mérida]], [[Yucatán]]  
|Filip Wolski (Poland)
|480/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2006|title=IOI 2006 Results}}</ref> ||
|-
|-
| 19 || 2007 || August 15–22 || {{flagicon|Croatia}} [[Croatia]] || [[Zagreb]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2007|title=IOI 2007 Results}}</ref> || <ref>{{cite web|url=https://ioi2007.hsin.hr/|title=IOI 2007 Website|website=ioi2007}}</ref>
| 19 || 2007 || August 15–22 || {{flagicon|Croatia}} [[Croatia]] || [[Zagreb]]  
|Tomasz Kulczyński (Poland)
|574/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2007|title=IOI 2007 Results}}</ref> || <ref>{{cite web|url=https://ioi2007.hsin.hr/|title=IOI 2007 Website|website=ioi2007}}</ref>
|-
|-
| 20 || 2008 || August 16–23 || {{flagicon|Egypt}} [[Egypt]] || [[Cairo]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2008|title=IOI 2008 Results}}</ref> ||
| 20 || 2008 || August 16–23 || {{flagicon|Egypt}} [[Egypt]] || [[Cairo]]  
|Huacheng Yu (China)
|558/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2008|title=IOI 2008 Results}}</ref> ||
|-
|-
| 21 || 2009 || August 8–15 || {{flagicon|Bulgaria}} [[Bulgaria]] || [[Plovdiv]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2009|title=IOI 2009 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2009.org/|title=IOI 2009 Website|website=ioi2009.org}}</ref>
| 21 || 2009 || August 8–15 || {{flagicon|Bulgaria}} [[Bulgaria]] || [[Plovdiv]]  
|[[Gennady Korotkevich]] (Belarus)
|743/800|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2009|title=IOI 2009 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2009.org/|title=IOI 2009 Website|website=ioi2009.org}}</ref>
|-
|-
| 22 || 2010 || August 14–21 || {{flagicon|CAN}} [[Canada]] || [[Waterloo, Ontario]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2010|title=IOI 2010 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2010.org/|title=IOI 2010 Website|website=ioi2010.org}}</ref>
| 22 || 2010 || August 14–21 || {{flagicon|CAN}} [[Canada]] || [[Waterloo, Ontario]]  
|[[Gennady Korotkevich]] (Belarus)
|778/800|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2010|title=IOI 2010 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2010.org/|title=IOI 2010 Website|website=ioi2010.org}}</ref>
|-
|-
| 23 || 2011 || July 22–29 || {{flagicon|THA}} [[Thailand]] || [[Pattaya]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2011|title=IOI 2011 Results}}</ref>|| <ref>{{cite web|url=http://www.ioi2011.or.th/|title=IOI 2011 Website|website=ioi2011|access-date=2010-07-28|archive-date=2010-09-04|archive-url=https://web.archive.org/web/20100904044842/http://www.ioi2011.or.th/|url-status=dead}}</ref>
| 23 || 2011 || July 22–29 || {{flagicon|THA}} [[Thailand]] || [[Pattaya]]  
|[[Gennady Korotkevich]] (Belarus)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2011|title=IOI 2011 Results}}</ref>|| <ref>{{cite web|url=http://www.ioi2011.or.th/|title=IOI 2011 Website|website=ioi2011|access-date=2010-07-28|archive-date=2010-09-04|archive-url=https://web.archive.org/web/20100904044842/http://www.ioi2011.or.th/|url-status=dead}}</ref>
|-
|-
| 24 || 2012 || September 23–30 || {{flagicon|ITA}} [[Italy]] || [[Sirmione]] and [[Montichiari]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2012|title=IOI 2012 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2012.org/|title=IOI 2012 Website|website=ioi2012.org}}</ref>
| 24 || 2012 || September 23–30 || {{flagicon|ITA}} [[Italy]] || [[Sirmione]] and [[Montichiari]]  
|Johnny Ho (United States of America)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2012|title=IOI 2012 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2012.org/|title=IOI 2012 Website|website=ioi2012.org}}</ref>
|-
|-
| 25 || 2013 || July 6–13 || {{flagicon|AUS}} [[Australia]] || [[Brisbane]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2013|title=IOI 2013 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2013.org/|title=IOI 2013 Website|website=ioi2013.org}}</ref>
| 25 || 2013 || July 6–13 || {{flagicon|AUS}} [[Australia]] || [[Brisbane]]  
|Lijie Chen (China)
|569/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2013|title=IOI 2013 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2013.org/|title=IOI 2013 Website|website=ioi2013.org}}</ref>
|-
|-
| 26 || 2014 || July 13–20 || {{flagicon|TWN}} [[Taiwan]] || [[Taipei]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2014|title=IOI 2014 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2014.org/|title=IOI 2014 Website|website=ioi2014.org}}</ref>
| 26 || 2014 || July 13–20 || {{flagicon|TWN}} [[Taiwan]] || [[Taipei]]  
|Ishraq Huda (Australia), Scott Wu (United States of America), Yinzhan Xu (China)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2014|title=IOI 2014 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2014.org/|title=IOI 2014 Website|website=ioi2014.org}}</ref>
|-
|-
| 27 || 2015 || July 26 – August 2 || {{flagicon|Kazakhstan}} [[Kazakhstan]] || [[Almaty]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2015|title=IOI 2015 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2015.kz/|title=IOI 2015 Website|website=ioi2017.kz}}</ref>
| 27 || 2015 || July 26 – August 2 || {{flagicon|Kazakhstan}} [[Kazakhstan]] || [[Almaty]]  
|Jeehak Yoon (Republic of Korea)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2015|title=IOI 2015 Results}}</ref> || <ref>{{cite web|url=http://www.ioi2015.kz/|title=IOI 2015 Website|website=ioi2017.kz}}</ref>
|-
|-
| 28 || 2016 || August 12–19 || {{flagicon|RUS}} [[Russia]] || [[Kazan]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2016|title=IOI 2016 Results}}</ref> || <ref>{{cite web|url=http://ioi2016.ru/|title=IOI 2016 Website|website=ioi2016.ru|access-date=2023-08-16|archive-date=2016-02-11|archive-url=https://web.archive.org/web/20160211185940/http://ioi2016.ru/|url-status=dead}}</ref>
| 28 || 2016 || August 12–19 || {{flagicon|RUS}} [[Russia]] || [[Kazan]]  
|Ce Jin (China)
|597/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2016|title=IOI 2016 Results}}</ref> || <ref>{{cite web|url=http://ioi2016.ru/|title=IOI 2016 Website|website=ioi2016.ru|access-date=2023-08-16|archive-date=2016-02-11|archive-url=https://web.archive.org/web/20160211185940/http://ioi2016.ru/|url-status=dead}}</ref>
|-
|-
| 29 || 2017 || July 28 – August 4 || {{flagicon|IRN}} [[Iran]] || [[Tehran]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2017|title=IOI 2017 Results}}</ref> || <ref>{{cite web|url=http://ioi2017.org/|title=IOI 2017 Website|website=ioi2017.org}}</ref>
| 29 || 2017 || July 28 – August 4 || {{flagicon|IRN}} [[Iran]] || [[Tehran]]  
|Yuta Takaya (Japan)
|589.52/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2017|title=IOI 2017 Results}}</ref> || <ref>{{cite web|url=http://ioi2017.org/|title=IOI 2017 Website|website=ioi2017.org}}</ref>
|-
|-
| 30 || 2018 || September 1–8
| 30 || 2018 || September 1–8
| {{flagicon|Japan}} [[Japan]]  || [[Tsukuba, Ibaraki|Tsukuba]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2018|title=IOI 2018 Results}}</ref>|| <ref>{{cite web|url=https://ioi2018.jp/|title=IOI 2018 Website|website=ioi2018.jp}}</ref>
| {{flagicon|Japan}} [[Japan]]  || [[Tsukuba, Ibaraki|Tsukuba]]  
|Benjamin Qi (United States of America)
|499/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2018|title=IOI 2018 Results}}</ref>|| <ref>{{cite web|url=https://ioi2018.jp/|title=IOI 2018 Website|website=ioi2018.jp}}</ref>
|-
|-
| 31 || 2019 || August 4–11 || {{flagicon|Azerbaijan}} [[Azerbaijan]]  || [[Baku]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2019|title=IOI 2019 Results}}</ref>|| <ref>{{cite web|url=https://ioi2019.az/|title=IOI 2019 Website|website=ioi2019.az|access-date=2023-08-16|archive-date=2022-04-01|archive-url=https://web.archive.org/web/20220401074332/https://ioi2019.az/|url-status=dead}}</ref>
| 31 || 2019 || August 4–11 || {{flagicon|Azerbaijan}} [[Azerbaijan]]  || [[Baku]]  
|Benjamin Qi (United States of America)
|547.09/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2019|title=IOI 2019 Results}}</ref>|| <ref>{{cite web|url=https://ioi2019.az/|title=IOI 2019 Website|website=ioi2019.az|access-date=2023-08-16|archive-date=2022-04-01|archive-url=https://web.archive.org/web/20220401074332/https://ioi2019.az/|url-status=dead}}</ref>
|-
|-
| 32 || 2020 || September 13–19{{ref|Alpha|a}} || {{flagicon|Singapore}} [[Singapore]] || ''online'' || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2020|title=IOI 2020 Results}}</ref> || <ref>{{cite web|url=https://ioi2020.sg/|title=IOI 2020 Website|website=ioi2020.sg}}</ref>
| 32 || 2020 || September 13–19{{ref|Alpha|a}} || {{flagicon|Singapore}} [[Singapore]] || ''online''  
|William Lin (United States of America)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2020|title=IOI 2020 Results}}</ref> || <ref>{{cite web|url=https://ioi2020.sg/|title=IOI 2020 Website|website=ioi2020.sg}}</ref>
|-
|-
| 33 || 2021 || June 19–25 || {{flagicon|Singapore}} [[Singapore]] || ''online'' || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2021|title=IOI 2021 Results}}</ref> || <ref>{{cite web|url=https://ioi2021.sg/|title=IOI 2021 Website|website=ioi2021.sg}}</ref>
| 33 || 2021 || June 19–25 || {{flagicon|Singapore}} [[Singapore]] || ''online''  
|Mingyang Deng (China)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2021|title=IOI 2021 Results}}</ref> || <ref>{{cite web|url=https://ioi2021.sg/|title=IOI 2021 Website|website=ioi2021.sg}}</ref>
|-
|-
| 34 || 2022 || August 7–15 || {{flagicon|Indonesia}} [[Indonesia]] || [[Yogyakarta]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2022|title=IOI 2022 Results}}</ref> || <ref>{{cite web|url=https://ioi2022.id/|title=IOI 2022 Website|website=ioi2022.id}}</ref>
| 34 || 2022 || August 7–15 || {{flagicon|Indonesia}} [[Indonesia]] || [[Yogyakarta]]  
|Jiangqi Dai (China), Shaoxuan Tang (China)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2022|title=IOI 2022 Results}}</ref> || <ref>{{cite web|url=https://ioi2022.id/|title=IOI 2022 Website|website=ioi2022.id}}</ref>
|-
|-
| 35 || 2023 || August 28 – September 4 || {{flagicon|Hungary}} [[Hungary]] || [[Szeged]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2023|title=IOI 2023 Results}}</ref> || <ref>{{cite web|url=https://ioi2023.hu/|title=IOI 2023 Website|website=ioi2023.hu}}</ref>
| 35 || 2023 || August 28 – September 4 || {{flagicon|Hungary}} [[Hungary]] || [[Szeged]]  
|Tingqiang Xu (China)
|580/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2023|title=IOI 2023 Results}}</ref> || <ref>{{cite web|url=https://ioi2023.hu/|title=IOI 2023 Website|website=ioi2023.hu}}</ref>
|-
|-
| 36 || 2024 || September 1–8 || {{flagicon|Egypt}} [[Egypt]] || [[Alexandria]] || <ref>{{cite web|url=https://stats.ioinformatics.org/results/2024|title=IOI 2024 Results}}</ref> || <ref>{{cite web|url=https://www.ioi2024.eg/|title=IOI 2024 Website|website=ioi2024.eg}}</ref>
| 36 || 2024 || September 1–8 || {{flagicon|Egypt}} [[Egypt]] || [[Alexandria]]  
|Kangyang Zhou (China)
|600/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2024|title=IOI 2024 Results}}</ref> || <ref>{{cite web|url=https://www.ioi2024.eg/|title=IOI 2024 Website|website=ioi2024.eg}}</ref>
|-
|-
| 37 || 2025 || July 27 – August 3 || {{flagicon|Bolivia}} [[Bolivia]] || [[Sucre]] || || <ref>{{cite web|url=https://ioi2025.bo/|title=IOI 2025 Website|website=ioi2025.bo}}</ref>
| 37 || 2025 || July 27 – August 3 || {{flagicon|Bolivia}} [[Bolivia]] || [[Sucre]]  
|Hengxi Liu (China)
|591.23/600|| <ref>{{cite web|url=https://stats.ioinformatics.org/results/2025|title=IOI 2025 Results}}</ref> || <ref>{{cite web|url=https://ioi2025.bo/|title=IOI 2025 Website|website=ioi2025.bo}}</ref>
|-
|-
| 38 || 2026 || || {{flagicon|Uzbekistan}} [[Uzbekistan]] || || || <ref>{{cite web|url=https://ioi2026.uz/|title=IOI 2026 Website|website=ioi2026.uz}}</ref>
| 38 || 2026 || August 9–16 || {{flagicon|Uzbekistan}} [[Uzbekistan]] || [[Tashkent]]
|
| || || <ref>{{cite web|url=https://ioi2026.uz/|title=IOI 2026 Website|website=ioi2026.uz}}</ref>
|-
|-
| 39 || 2027 || || {{flagicon|Germany}} [[Germany]] || [[Potsdam]] || ||
| 39 || 2027 || September 12–19 || {{flagicon|Germany}} [[Germany]] || [[Potsdam]]  
|
| || || <ref>{{cite web|url=https://ioi2027.de/|title=IOI 2027 Website|website=ioi2027.de}}{{Dead link|date=October 2025 |bot=InternetArchiveBot }}</ref>
|-
| 40 || 2028 || || {{flagicon|Japan}} [[Japan]] ||
|
| || ||
|-
| 41 || 2029 || || {{flagicon|Bulgaria}} [[Bulgaria]] ||
|
| || ||
|-
|-
|}
|}
Line 250: Line 338:


{{Medals table
{{Medals table
  | caption        = As of 2024
  | caption        = As of 2025
  | gold_CHN = 102 | silver_CHN = 28 | bronze_CHN = 12
  | gold_CHN = 106 | silver_CHN = 28 | bronze_CHN = 12
| gold_USA = 69 | silver_USA = 41 | bronze_USA = 17
  | gold_RUS = 68 | silver_RUS = 40 | bronze_RUS = 12
  | gold_RUS = 68 | silver_RUS = 40 | bronze_RUS = 12
| gold_USA = 68 | silver_USA = 39 | bronze_USA = 16
  | gold_KOR = 53 | silver_KOR = 50 | bronze_KOR = 28
  | gold_KOR = 49 | silver_KOR = 50 | bronze_KOR = 28
  | gold_POL = 45 | silver_POL = 54 | bronze_POL = 36
  | gold_POL = 44 | silver_POL = 52 | bronze_POL = 35
  | gold_ROU = 38 | silver_ROU = 60 | bronze_ROU = 37
  | gold_JPN = 37 | silver_JPN = 30 | bronze_JPN = 10
  | gold_JPN = 38 | silver_JPN = 33 | bronze_JPN = 10
  | gold_ROU = 34 | silver_ROU = 60 | bronze_ROU = 37
  | gold_IRN = 33 | silver_IRN = 69 | bronze_IRN = 25
  | gold_IRN = 32 | silver_IRN = 67 | bronze_IRN = 24
  | gold_BGR = 29 | silver_BGR = 57 | bronze_BGR = 45
  | gold_BGR = 27 | silver_BGR = 55 | bronze_BGR = 45
  | gold_TWN = 26 | silver_TWN = 64 | bronze_TWN = 30
  | gold_SVK = 26 | silver_SVK = 45 | bronze_SVK = 36
}}
}}


==Multiple IOI winners==
==Top Performances==


The following is a list of the top performers in the history of the IOI.<ref>{{cite web|url=http://stats.ioinformatics.org/halloffame/|title=Hall of Fame|website=stats.ioinformatics.org}}</ref> The <sup>P</sup> sign indicates a perfect score, a rare achievement in IOI history. The <sup>U</sup> sign indicates an unofficial participation, where a contestant participated in a host's second team. Also, first ('''I'''), second ('''II''') and third ('''III''') places among gold medalists are indicated where appropriate.  
The following is a list of the top performers in the history of the IOI, with the list containing any contestant with at least 3 gold medals.<ref>{{cite web|url=http://stats.ioinformatics.org/halloffame/|title=Hall of Fame|website=stats.ioinformatics.org}}</ref> The <sup>P</sup> sign indicates a perfect score, a rare achievement in IOI history. The <sup>U</sup> sign indicates an unofficial participation, where a contestant participated in a host's second team. Also, first ('''I'''), second ('''II''') and third ('''III''') places among gold medalists are indicated where appropriate.


{| class="wikitable" style="margin:auto" align="left"
{| class="wikitable" style="margin:auto" align="left"
Line 271: Line 359:
! Name || Team || colspan=7 | Years
! Name || Team || colspan=7 | Years
|-
|-
|[[Gennady Korotkevich]] || Belarus || '''G(II)''' 2012 || '''G<sup>P</sup>(I)''' 2011 || '''G(I)''' 2010 || '''G(I)''' 2009 || '''G''' 2008 || '''G''' 2007  || '''S''' 2006
| [[Gennady Korotkevich]] || Belarus || '''G(II)''' 2012 || '''G<sup>P</sup>(I)''' 2011 || '''G(I)''' 2010 || '''G(I)''' 2009 || '''G''' 2008 || '''G''' 2007  || '''S''' 2006
|-
|Bruce Merry || South Africa || '''G''' 2001 || '''G''' 2000  || '''S''' 1999  || '''B''' 1998  || '''B''' 1997  || '''B''' 1996 ||
|-
|Rumen Hristov || Bulgaria || '''G''' 2012 || '''G''' 2011 || '''G(II)''' 2010  || '''S''' 2009  || '''S''' 2008 || ||
|-
|-
|Hristo Venev || Bulgaria || '''G''' 2016 || '''G''' 2015 || '''G''' 2014 || '''G''' 2013 || '''S''' 2012 || ||
| Hristo Venev || Bulgaria || '''G''' 2016 || '''G''' 2015 || '''G''' 2014 || '''G''' 2013 || '''S''' 2012 || ||
|-
|-
|Encho Mishinev || Bulgaria || '''G''' 2017 || '''G''' 2014 || '''S''' 2016 || '''S''' 2015 || '''S''' 2013 || ||
| Rain Jiang || United States || '''G''' 2025 || '''G''' 2024 || '''G''' 2023 || '''G''' 2021 || '''S''' 2022 || ||
|-
|-
|Egor Lifar || Russia || '''G''' 2021 || '''G''' 2019 || '''S''' 2020 || '''S''' 2018 || '''S''' 2017 || ||
| Zixiang Zhou || Canada || '''G''' 2022 || '''G''' 2021 || '''G''' 2020 || '''G(III)''' 2019 || '''S''' 2018 || ||
|-
|-
|Harris Leung || Hong Kong || '''G''' 2021 || '''G(III)''' 2020  || '''S''' 2019  || '''B''' 2018 || '''B''' 2017 || ||
| Filip Wolski || Poland || '''G(I)''' 2006 || '''G''' 2005 || '''G''' 2004 || '''G''' 2003 || || ||
|-
|-
|Zixiang Zhou || Canada || '''G''' 2022 || '''G''' 2021 || '''G''' 2020 || '''G(III)''' 2019 || '''S''' 2018 || ||
| Rareș Darius Buhai || Romania || '''G''' 2015 || '''G''' 2014 || '''G''' 2013  || '''G''' 2012 || || ||
|-
|-
|Wolfgang Thaller || Austria || '''G''' 1997 || '''G''' 1996 || '''S''' 1999 || '''S''' 1998 || || ||
| Yuta Takaya || Japan || '''G(I)''' 2017 || '''G''' 2016 || '''G''' 2015 || '''G''' 2014 || || ||
|-
|-
|Andrzej Gąsienica-Samek || Poland || '''G''' 1999 || '''G''' 1998 || '''G''' 1997 || '''S''' 1996 || || ||
| Rumen Hristov || Bulgaria || '''G''' 2012 || '''G''' 2011 || '''G(II)''' 2010  || '''S''' 2009  || '''S''' 2008 || ||
|-
|-
|Martin Pettai || Estonia || '''G''' 2002 || '''G''' 2001 || '''G''' 2000 || '''S''' 1999 ||  ||  ||
| Andrzej Gąsienica-Samek || Poland || '''G''' 1999 || '''G''' 1998 || '''G''' 1997 || '''S''' 1996 ||  ||  ||
|-
|-
|Alex Schwendner || United States || '''G''' 2005 || '''G''' 2003  || '''S''' 2004 || '''S''' 2002 ||  ||  ||
| Eduard Batmendijn || Slovakia || '''G''' 2015 || '''G''' 2013 || '''G''' 2012 || '''S''' 2014 ||  ||  ||
|-
|-
|Filip Wolski || Poland || '''G(I)''' 2006 || '''G''' 2005 || '''G''' 2004 || '''G''' 2003 || || ||
| Martin Pettai || Estonia || '''G''' 2002 || '''G''' 2001 || '''G''' 2000 || '''S''' 1999 || || ||
|-
|-
|Goran Žužić || Croatia || '''G''' 2008 || '''G''' 2007  || '''S''' 2009 || '''B''' 2006 ||  ||  ||
| Nikoloz Birkadze || Georgia || '''G''' 2020 || '''G''' 2019 || '''G''' 2018  || '''S''' 2017 ||  ||  ||
|-
|-
|Vlad Alexandru Gavrilă || Romania || '''G''' 2013 || '''G''' 2012  || '''S''' 2011 || '''B''' 2010 ||  ||  ||
| Patrick Pavić || Croatia || '''G''' 2022 || '''G''' 2021 || '''G''' 2020  || '''S''' 2019 ||  ||  ||
|-
|-
|Eduard Batmendijn || Slovakia || '''G''' 2015 || '''G''' 2013 || '''G''' 2012 || '''S''' 2014 ||  ||  ||
| Ryan Bai || Canada || '''G''' 2025 || '''G''' 2024 || '''G''' 2023 || '''S''' 2022 ||  ||  ||
|-
|-
|Rareș Darius Buhai || Romania || '''G''' 2015 || '''G''' 2014 || '''G''' 2013 || '''G''' 2012 || ||  ||
| Daiki Kodama || Japan || '''G''' 2023 || '''G''' 2022 || '''G''' 2021 || || ||  ||
|-
|-
|Yuta Takaya || Japan || '''G(I)''' 2017 || '''G''' 2016 || '''G''' 2015 || '''G''' 2014 || || ||
| Daniel Weber || Israel || '''G''' 2024 || '''G''' 2023 || '''G''' 2022  || || || ||
|-
|-
|Nikoloz Birkadze || Georgia || '''G''' 2020 || '''G''' 2019 || '''G''' 2018  || '''S''' 2017 ||  ||  ||
| Jarosław Kwiecień || Poland || '''G''' 2016 || '''G''' 2015 || '''G''' 2014 || ||  ||  ||
|-
|-
|Dorijan Lendvaj || Croatia || '''G''' 2022 || '''G''' 2021 || '''S''' 2020 || '''B''' 2019 ||  ||  ||
| [[John Pardon]] || United States || '''G''' 2007 || '''G''' 2006 || '''G''' 2005 || ||  ||  ||
|-
|-
|Patrick Pavić || Croatia || '''G''' 2022 || '''G''' 2021 || '''G''' 2020  || '''S''' 2019 ||  ||  ||
| Marcin Andrychowicz || Poland || '''G''' 2008 || '''G''' 2007  || '''G''' 2006 || ||  ||  ||
|-
|-
|Fredrik Huss || Sweden || '''G<sup>P</sup>(I)''' 1993 || '''G<sup>P</sup>(I)''' 1992 || '''S''' 1991 || || || ||
| Martin Mareš || Czech Republic || '''G''' 1995 || '''G''' 1994  || '''G<sup>P</sup>(I)''' 1993 || || || ||
|-
|-
|Martin Mareš || Czech Republic || '''G''' 1995 || '''G''' 1994  || '''G<sup>P</sup>(I)''' 1993 ||  ||  ||  ||
| Masataka Yoneda || Japan || '''G''' 2020 || '''G''' 2019 || '''G<sup>U</sup>''' 2018  ||  ||  ||  ||
|-
|-
|Vladimir Martianov || Russia || '''G''' 1999 || '''G<sup>P</sup>(I)''' 1998 || '''G(I)''' 1997 ||  ||  ||  ||
| Neal Wu || United States || '''G''' 2010 || '''G''' 2009  || '''G''' 2008 ||  ||  ||  ||
|-
|-
|[[John Pardon]] || United States || '''G''' 2007 || '''G''' 2006  || '''G''' 2005 ||  ||  ||  ||
| [[Scott Wu]] || United States || '''G<sup>P</sup>(I)''' 2014 || '''G''' 2013 || '''G''' 2012 ||  ||  ||  ||
|-
|-
|Marcin Andrychowicz || Poland || '''G''' 2008 || '''G''' 2007 || '''G''' 2006 ||  ||  ||  ||
| Shogo Murai || Japan || '''G''' 2012 || '''G''' 2011 || '''G''' 2010 ||  ||  ||  ||
|-
|-
|Neal Wu || United States || '''G''' 2010 || '''G''' 2009  || '''G''' 2008 ||  ||  ||  ||
| Vladimir Martianov || Russia || '''G''' 1999 || '''G<sup>P</sup>(I)''' 1998 || '''G(I)''' 1997 ||  ||  ||  ||
|-
|-
|Shogo Murai || Japan || '''G''' 2012 || '''G''' 2011  || '''G''' 2010 ||  ||  ||  ||
| Vladimir Romanov || Russia || '''G''' 2019 || '''G''' 2018 || '''G''' 2017 ||  ||  ||  ||
|-
|[[Scott Wu]] || United States || '''G<sup>P</sup>(I)''' 2014 || '''G''' 2013 || '''G''' 2012 ||  ||  ||  ||
|-
|Jarosław Kwiecień || Poland || '''G''' 2016 || '''G''' 2015 || '''G''' 2014 ||  ||  ||  ||
|-
|Vladimir Romanov || Russia || '''G''' 2019 || '''G''' 2018 || '''G''' 2017 ||  ||  ||  ||
|-
|Masataka Yoneda || Japan || '''G''' 2020 || '''G''' 2019 || '''G<sup>U</sup>''' 2018  ||  ||  ||  ||
|-
|Daiki Kodama || Japan || '''G''' 2023 || '''G''' 2022 || '''G''' 2021  ||  ||  ||  ||
|-
|-
|}
|}
{{Clr}}
{{Clear}}


== Feeder competitions ==
== Feeder competitions ==
Most participating countries use feeder competitions to select their team. A number of these are listed below:
Most participating countries use feeder competitions to select their team. They are usually referred to as '''National Olympiad in Informatics''' and is the course of selection of the country's top team or persons to participate in the IOI. A number of these are listed below:


{{columns-list|colwidth=30em|
{{columns-list|colwidth=30em|
Line 350: Line 424:
* [[Central European Olympiad in Informatics]]
* [[Central European Olympiad in Informatics]]
* [[Indian Computing Olympiad]]
* [[Indian Computing Olympiad]]
* [[National Olympiad in Informatics]]
* {{ill|National Olympiad in Informatics, China|zh|全國青少年信息學奧林匹克競賽}}
* [[National Olympiad in Informatics, China]]
* {{ill|Olimpiada Națională de Informatică|ro}}<ref>http://olimpiada.info/Romanian National Informatics Olympiad {{Webarchive|url=https://web.archive.org/web/20190624190734/http://olimpiada.info/ |date=2019-06-24 }}</ref>
* {{ill|Olimpiada Națională de Informatică|ro}}<ref>http://olimpiada.info/Romanian National Informatics Olympiad {{Webarchive|url=https://web.archive.org/web/20190624190734/http://olimpiada.info/ |date=2019-06-24 }}</ref>
* {{ill|Nederlandse Informatica Olympiade|nl}}<ref>{{cite web| url = https://informaticaolympiade.nl| title = Informatica Olympiade}}</ref>
* {{ill|Nederlandse Informatica Olympiade|nl}}<ref>{{cite web| url = https://informaticaolympiade.nl| title = Informatica Olympiade}}</ref>
Line 363: Line 436:
* Egyptian Olympiad in Informatics
* Egyptian Olympiad in Informatics
* [[National Olympiad in Informatics - Philippines]]<ref>{{cite web| url = https://noi.ph| title = Home — NOI.PH}}</ref>
* [[National Olympiad in Informatics - Philippines]]<ref>{{cite web| url = https://noi.ph| title = Home — NOI.PH}}</ref>
* [[Bundeswettbewerb Informatik]] - Germany
* {{ill|Bundeswettbewerb Informatik|de}} - Germany
* [[Vietnamese Olympiad in Informatics]]
* {{ill|Vietnamese Olympiad in Informatics|vi|Olympic Tin học Sinh viên Việt Nam}}
* [[Thailand Olympiad in Informatics]] (TOI)
 
}}
}}
{{Further|National Olympiad in Informatics}}
{{Further|National Olympiad in Informatics}}
Line 372: Line 447:


== See also ==
== See also ==
* [[List of computer science awards]]
* [[List of computer science awards]]
* [[International Science Olympiad]]
* [[International Science Olympiad]]
Line 379: Line 453:
* [[Competitive programming]]
* [[Competitive programming]]
* [[International Mathematical Olympiad]]
* [[International Mathematical Olympiad]]
* [[Capture the flag (cybersecurity)]]


== References ==
== References ==

Latest revision as of 00:42, 2 November 2025

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File:InternationalOlympiadInInformatics.png
The logo of the International Olympiad in Informatics

The International Olympiad in Informatics (IOI) is an annual competitive programming competition and one of the International Science Olympiads for secondary school students. The first IOI was held in 1989 in Pravetz, Bulgaria.

Each country sends a team of up to four students, plus one team leader, one deputy leader, and guests. Students in each country are selected for their country's team through national computing contests. Students at the IOI compete on an individual basis. There is no official team ranking.

The contest consists of two days of solving six complicated algorithmic tasks by writing computer programs in C++.[1][2] All task materials are published on each year's contest website soon after the competition ends.

Competition structure and participation

File:IOI 2006 competition room.png
The competition room at the IOI 2006

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File:IOI Zagreb 1.JPG
In front of the competition room at the IOI 2007

On each of the two competition days, the competitors are typically given three problems which they have to solve in five hours. Each student works on their own to solve the problems with no outside help, specifically no communication with other contestants, books, web access, etc. Contestants are typically allowed to bring non-programmable wired keyboards and mice.[3] Usually to solve a task the contestant has to write a computer program (in C++) and submit it before the five-hour competition time ends. The program is graded based on secret test data. Since IOI 2010, tasks are divided into subtasks with graduated difficulty, and points are awarded only when all tests for a particular subtask yield correct results, within specific time and memory limits. In some cases, the contestant's program has to interact with a secret computer library, which allows problems where the input is not fixed, but depends on the program's actions – for example in game problems (a.k.a. interactive problems). Another type of problem has the inputs publicly available, for these, the contestants have to submit an output file instead of a program, and it is up to them whether they obtain the output files by writing a program (possibly exploiting special characteristics of the input), or by hand, or by a combination of these means. Pascal has been removed as an available programming language as of 2019.[4]:11

IOI 2010 for the first time had a live web scoreboard with real-time provisional results. Submissions will be scored as soon as possible during the contest, and the results posted. Contestants will be aware of their scores, but not others', and may resubmit to improve their scores. Starting from 2012, IOI has been using the Contest Management System (CMS) for developing and monitoring the contest.[5]

The scores from the two competition days and all problems are summed up separately for each contestant. Medals are awarded depending on their relative total score. The top 50% of the contestants are awarded medals, such that the relative number of gold : silver : bronze : no medal is approximately 1:2:3:6 (thus 1/12 of the contestants get a gold medal).

Prior to IOI 2010, students who did not receive medals did not have their scores published, although the scores of students who did not receive medals are still not available in the official results, they are known from the live web scoreboard. In IOI 2012 the top 3 nations ranked by aggregate score (Russia, China and USA) were subsequently awarded during the closing ceremony.

Analysis of female performance shows 77.9% of women obtain no medal, while 49.2% of men obtain no medal. "The average female participation was 4.4% in 1989–1994 and 2.2% in 1996–2014." It also suggests much higher participation of women on the national level, claiming sometimes double-digit percentages in total participation on the first stage.[6] President of the IOI (2011-2014), Richard Forster, says the competition has difficulty attracting women and that in spite of trying to solve it, "none of us have hit on quite what the problem is, let alone the solution."[1] The European Girls’ Olympiad in Informatics (EGOI), which was first held in 2021 was started with the goal to increscent female participants at IOI and other Informatics Olympiads.[7]

In IOI 2017 held in Iran, due to not being able to participate in Iran, the Israeli students participated in an offsite competition organized by IOI in Russia.[4]:11 Due to visa issues, the full USA team was unable to attend, although one contestant Zhezheng Luo[8] was able to attend by traveling with the Chinese team[9] and winning gold medal and 3rd place in standings.[10]

In IOI 2019 held in Azerbaijan, the Armenia team did not participate due to the dispute between the two countries, despite the guarantees provided[11] and official invitation letter sent by the host Azerbaijan.

Due to the COVID-19 pandemic, both the IOI 2020 and IOI 2021, originally scheduled to be hosted by Singapore, were held as online contests. The IOI 2022, hosted by Indonesia, was held as a hybrid event, with around 25% of the contestants participating online.[12]

In response to the invasion of Ukraine, students from Russia and Belarus can only participate as individuals under the IOI flag but not as national delegations starting from IOI 2022, and they would only participate online for IOI 2022.[13] From 2023 onwards they would participate in person, but under the IOI flag.

In response to the conflict and humanitarian crisis in Gaza, students from Israel can only participate as individuals under the IOI flag but not as a national delegation from IOI 2025 onwards. Over two thirds of the delegations voted in favour of the sanction in the IOI General Assembly.[14]

Members

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Former members

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Summary

Number Year Dates Host country Host city Absolute Winner Score Results Website
1 1989 May 16–19 Template:Flagicon Bulgaria Pravetz Teodor Tonchev (Bulgaria) 100/100 [15]
2 1990 July 15–21 Template:Flagicon Belarus, Soviet Union Minsk Tsvetomir Petrov (Bulgaria) 160/200 [16]
3 1991 May 19–25 Template:Flagicon Greece Athens Igor Maly (Czechoslovakia) 196/200 [17]
4 1992 July 11–21 Template:Flagicon Germany Bonn Bom Jun Kim (Republic of Korea), Fredrik Huss (Sweden), Gao Chen (China), Jittat Fakcharoenphol (Thailand), Laszlo Peter (Hungary), Matej Ondrusek (Czechoslovakia), Nathan Bronson (United States of America), Pinit Asavanuchit (Thailand), Shawn Smith (United States of America), Viet Nguyen Tuan (Vietnam), Xing Wu (China), Yunhe Yang (China), Niklas Eén (Sweden) 200/200 [18]
5 1993 October 16–25 Template:Flagicon Argentina Mendoza Fredrik Huss (Sweden), Martin Mareš (Czech Republic), Mehdi Foladgar (Iran), Radu-Lucian Lupsa (Romania) 200/200 [19] [20]
6 1994 July 3–10 Template:Flagicon Sweden Haninge Victor Bargatchev (Russia) 195/200 [21] [22]
7 1995 June 26 – July 3 Template:Flagicon Netherlands Eindhoven Victor Bargatchev (Russia) 186/200 [23]
8 1996 July 25 – August 2 Template:Flagicon Hungary Veszprém Daniel Kráľ (Czech Republic) 196/200 [24]
9 1997 November 30 – December 7 Template:Flagicon South Africa Cape Town Vladimir Martianov (Russia) 462/600 [25]
10 1998 September 5–12 Template:Flagicon Portugal Setúbal Daniel Wright (South Africa), Mihai Stroe (Romania), Vladimir Martianov (Russia), Zhunping Zhang (China) 700/700 [26]
11 1999 October 9–16 Template:Flagicon Turkey Antalya-Belek Hong Chen (China) 480/600 [27]
12 2000 September 23–30 Template:Flagicon China Beijing Mikhail Baoutine (Russia) 700/700 [28]
13 2001 July 14–21 Template:Flagicon Finland Tampere Reid Barton (United States of America) 580/600 [29]
14 2002 August 18–25 Template:Flagicon Korea Rep. Yong-In Wan Yeong Jung (Republic of Korea) 510/600 [30]
15 2003 August 16–23 Template:Flagicon United States Kenosha, Wisconsin Hwan-Seung Yeo (Republic of Korea) 455.4/600 [31]
16 2004 September 11–18 Template:Flagicon Greece Athens Paul Jefferys (United Kingdom) 565/600 [32]
17 2005 August 18–25 Template:Flagicon Poland Nowy Sącz Eric Price (United States of America), Weidong Hu (China), Yuan Zhou (China), Yuriy Znovyak (Ukraine) 600/600 [33] [34]
18 2006 August 13–20 Template:Flagicon Mexico Mérida, Yucatán Filip Wolski (Poland) 480/600 [35]
19 2007 August 15–22 Template:Flagicon Croatia Zagreb Tomasz Kulczyński (Poland) 574/600 [36] [37]
20 2008 August 16–23 Template:Flagicon Egypt Cairo Huacheng Yu (China) 558/600 [38]
21 2009 August 8–15 Template:Flagicon Bulgaria Plovdiv Gennady Korotkevich (Belarus) 743/800 [39] [40]
22 2010 August 14–21 Template:Flagicon Canada Waterloo, Ontario Gennady Korotkevich (Belarus) 778/800 [41] [42]
23 2011 July 22–29 Template:Flagicon Thailand Pattaya Gennady Korotkevich (Belarus) 600/600 [43] [44]
24 2012 September 23–30 Template:Flagicon Italy Sirmione and Montichiari Johnny Ho (United States of America) 600/600 [45] [46]
25 2013 July 6–13 Template:Flagicon Australia Brisbane Lijie Chen (China) 569/600 [47] [48]
26 2014 July 13–20 Template:Flagicon Taiwan Taipei Ishraq Huda (Australia), Scott Wu (United States of America), Yinzhan Xu (China) 600/600 [49] [50]
27 2015 July 26 – August 2 Template:Flagicon Kazakhstan Almaty Jeehak Yoon (Republic of Korea) 600/600 [51] [52]
28 2016 August 12–19 Template:Flagicon Russia Kazan Ce Jin (China) 597/600 [53] [54]
29 2017 July 28 – August 4 Template:Flagicon Iran Tehran Yuta Takaya (Japan) 589.52/600 [55] [56]
30 2018 September 1–8 Template:Flagicon Japan Tsukuba Benjamin Qi (United States of America) 499/600 [57] [58]
31 2019 August 4–11 Template:Flagicon Azerbaijan Baku Benjamin Qi (United States of America) 547.09/600 [59] [60]
32 2020 September 13–19a Template:Flagicon Singapore online William Lin (United States of America) 600/600 [61] [62]
33 2021 June 19–25 Template:Flagicon Singapore online Mingyang Deng (China) 600/600 [63] [64]
34 2022 August 7–15 Template:Flagicon Indonesia Yogyakarta Jiangqi Dai (China), Shaoxuan Tang (China) 600/600 [65] [66]
35 2023 August 28 – September 4 Template:Flagicon Hungary Szeged Tingqiang Xu (China) 580/600 [67] [68]
36 2024 September 1–8 Template:Flagicon Egypt Alexandria Kangyang Zhou (China) 600/600 [69] [70]
37 2025 July 27 – August 3 Template:Flagicon Bolivia Sucre Hengxi Liu (China) 591.23/600 [71] [72]
38 2026 August 9–16 Template:Flagicon Uzbekistan Tashkent [73]
39 2027 September 12–19 Template:Flagicon Germany Potsdam [74]
40 2028 Template:Flagicon Japan
41 2029 Template:Flagicon Bulgaria

All-time medal table

Template:Medals table

Top Performances

The following is a list of the top performers in the history of the IOI, with the list containing any contestant with at least 3 gold medals.[75] The P sign indicates a perfect score, a rare achievement in IOI history. The U sign indicates an unofficial participation, where a contestant participated in a host's second team. Also, first (I), second (II) and third (III) places among gold medalists are indicated where appropriate.

Name Team Years
Gennady Korotkevich Belarus G(II) 2012 GP(I) 2011 G(I) 2010 G(I) 2009 G 2008 G 2007 S 2006
Hristo Venev Bulgaria G 2016 G 2015 G 2014 G 2013 S 2012
Rain Jiang United States G 2025 G 2024 G 2023 G 2021 S 2022
Zixiang Zhou Canada G 2022 G 2021 G 2020 G(III) 2019 S 2018
Filip Wolski Poland G(I) 2006 G 2005 G 2004 G 2003
Rareș Darius Buhai Romania G 2015 G 2014 G 2013 G 2012
Yuta Takaya Japan G(I) 2017 G 2016 G 2015 G 2014
Rumen Hristov Bulgaria G 2012 G 2011 G(II) 2010 S 2009 S 2008
Andrzej Gąsienica-Samek Poland G 1999 G 1998 G 1997 S 1996
Eduard Batmendijn Slovakia G 2015 G 2013 G 2012 S 2014
Martin Pettai Estonia G 2002 G 2001 G 2000 S 1999
Nikoloz Birkadze Georgia G 2020 G 2019 G 2018 S 2017
Patrick Pavić Croatia G 2022 G 2021 G 2020 S 2019
Ryan Bai Canada G 2025 G 2024 G 2023 S 2022
Daiki Kodama Japan G 2023 G 2022 G 2021
Daniel Weber Israel G 2024 G 2023 G 2022
Jarosław Kwiecień Poland G 2016 G 2015 G 2014
John Pardon United States G 2007 G 2006 G 2005
Marcin Andrychowicz Poland G 2008 G 2007 G 2006
Martin Mareš Czech Republic G 1995 G 1994 GP(I) 1993
Masataka Yoneda Japan G 2020 G 2019 GU 2018
Neal Wu United States G 2010 G 2009 G 2008
Scott Wu United States GP(I) 2014 G 2013 G 2012
Shogo Murai Japan G 2012 G 2011 G 2010
Vladimir Martianov Russia G 1999 GP(I) 1998 G(I) 1997
Vladimir Romanov Russia G 2019 G 2018 G 2017

Feeder competitions

Most participating countries use feeder competitions to select their team. They are usually referred to as National Olympiad in Informatics and is the course of selection of the country's top team or persons to participate in the IOI. A number of these are listed below:

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Notes

1.<templatestyles src="Citation/styles.css"/>^a IOI 2020 virtual closing ceremony was held on September 23, 2020.

See also

References

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External links

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