International Olympiad in Informatics
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[[Image:IOI_logo.gif|right]]
The '''International Olympiad in Informatics''' ('''IOI''') is an annual [[Computer science|informatics]] [[international science olympiad|competition]] for secondary school students. The first IOI was held in 1989 in [[Pravetz]], Bulgaria.
The contest consists of two days computer programming, solving problems of an [[algorithm|algorithmic]] nature. Students compete on an individual basis, with up to four students competing from each participating country (with around 81 countries in 2004). Students are selected through national computing contests. For example, in Britain, students compete in the [[British Informatics Olympiad|BIO]] for a place in the national team.
== Structure of the competition ==
On each of the two competition days, the students are typically given three problems which they have to solve in five hours. Each student works on his/her own, with only a computer and no other help allowed, specifically no communication with other contestants, books etc. Usually to solve a task the contestant has to write a computer program (in [[C (programming language)|C]], [[C++]] or [[Pascal programming language|Pascal]]) and submit it before the five hour competition time ends. Later on, the program is graded by being run with secret test data, consisting of multiple (typically 10 or 20) [[test case]]s. The contestant is awarded points for each test case that his program solves correctly, and within the given time and memory limit. 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. Another new type of problems has known inputs which are publicly available already during the five hours of the contest. For these, the contestants have to submit the according 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.
The scores from the two competition days and all problems are summed up separately for each contestant. At the awarding ceremony, contestants are awarded medals depending on their relative total score. The top 50% of the contestants (i.e. two per country, on average) 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).
[[Image:IOI 2006 competition room.png|thumb|The competition room at the IOI 2006|250px]]
[[Image:IOI Zagreb 1.JPG|thumb|250px|In front of the competition room at the IOI 2007]]
Unlike other science olympiads, the IOI regulations specifically prohibit ranking by countries. Although unofficial rankings are circulated within some participating nations, there is therefore no standard.
== List of IOI websites and locations ==
* '''IOI 2011''' will be held in [[Thailand]], 2011
* '''IOI 2010''' will be held in [[Waterloo, Ontario]], [[Canada]], 2010 [http://www.ioi2010.org/]
* '''IOI 2009''' will be held in [[Plovdiv]], [[Bulgaria]], 2009 [http://www.ioi2009.org/]
* '''IOI 2008''' will be held in [[Cairo]], [[Egypt]], August 16 - 23, 2008 [http://www.ioi2008.org]
* '''IOI 2007''' was held in [[Zagreb]], [[Croatia]], August 15 - 22, 2007 [http://www.hsin.hr/ioi2007/] ([http://ioi2007.hsin.hr/index.php?page=results results])
* '''IOI 2006''' was held in [[Mérida, Yucatán|Mérida]], [[Yucatán]], [[Mexico]], August 13 - 20, 2006
* '''IOI 2005''' was held in [[Nowy Sącz]], [[Poland]], August 18 - 25, 2005 [http://www.ioi2005.pl/] ([http://www.ioi2005.pl/competition/results/bycountry.php results])
* '''IOI 2004''' was held in [[Athens]], [[Greece]], September 11 - 18, 2004 [http://www.ioi2004.org/] ([http://www.ioi2004.org/html/competition_score.html results])
* '''IOI 2003''' was held in [[Kenosha, Wisconsin]], [[United States|USA]], August 16 - 23, 2003 [http://www.ioinformatics.org/ioi2003/] ([http://olympiads.win.tue.nl/ioi/ioi2003/medals.html results])
* '''IOI 2002''' was held in [[Yongin|Yong-In]], [[Republic of Korea]], August 18 - 25, 2002 [http://www.ioi2002.or.kr/]
* '''IOI 2001''' was held in [[Tampere]], [[Finland]], July 14 - 21, 2001 [http://www.ioi2001.edu.fi/]
* '''IOI 2000''' was held in [[Beijing]], [[People's Republic of China]], September 23 - 30, 2000
*'''IOI 1999''' was held in [[Antalya|Antalya-Belek]], [[Turkey]], October 9 - 16, 1999 [http://www.ioi99.org.tr/]
* '''IOI 1998''' was held in [[Setúbal]], [[Portugal]], September 5 - 12, 1998
* '''IOI 1997''' was held in [[Cape Town]], [[South Africa]], [[November 30]] - [[December 7]], [[1997]]
* '''IOI 1996''' was held in [[Veszprém]], [[Hungary]], [[July 25]] - [[August 2]], [[1996]]
* '''IOI 1995''' was held in [[Eindhoven]], The [[Netherlands]], [[June 26]] - [[July 3]], [[1995]] [http://olympiads.win.tue.nl/ioi95/]
* '''IOI 1994''' was held in [[Haninge]], [[Sweden]], July 3 - 10, 1994
* '''IOI 1993''' was held in [[Mendoza, Argentina|Mendoza]], [[Argentina]], October 16 - 25, 1993 [http://www.ioi.org.ar/mendoza/]
* '''IOI 1992''' was held in [[Bonn]], [[Germany]], July 11 - 21, 1992
* '''IOI 1991''' was held in [[Athens]], [[Greece]], May 19 - 25, 1991
* '''IOI 1990''' was held in [[Minsk]], [[Belarus|Belarusian SSR]], [[Soviet Union]], July 15 - 21, 1990
* '''IOI 1989''' was held in [[Pravets|Pravetz]], [[Bulgaria]], May 16 - 19, 1989.
==Multiple IOI Winners==
The following is a list of the top 20 performers in the history of the IOI. First ('''I'''), second ('''II''') and third ('''III''') places among gold medalists are indicated where appropriate.
<center>
<table class="wikitable">
<tr><th>Name</th><th>Team</th><th colspan=6 align=center>Years</th></tr>
<tr><td> Philip Wolski </td><td> Poland </td><td> '''G(I)''' 2006 </td><td> '''G''' 2005 </td><td> '''G''' 2004 </td><td> '''G''' 2003
</td><td> </td><td> </td></tr>
<tr><td> Martin Pettai </td><td> Estonia </td><td> '''G''' 2002 </td><td> '''G''' 2001 </td><td> '''G''' 2000 </td><td> '''S''' 1999
</td><td> </td><td> </td></tr>
<tr><td> Andrzej Gasienica-Samek </td><td> Poland </td><td> '''G''' 1999 </td><td> '''G''' 1998 </td><td> '''G''' 1997 </td><td> '''S''' 1996
</td><td> </td><td> </td></tr>
<tr><td> Vladimir Martianov </td><td> Russia </td><td> '''G''' 1999 </td><td> '''G(I)''' 1998 </td><td> '''G(I)''' 1997
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Martin Mares </td><td> Czech Republic </td><td> '''G''' 1995 </td><td> '''G''' 1994 </td><td> '''G''' 1993
</td><td> </td><td> </td><td> </td></tr>
<tr><td> John Pardon </td><td> United States </td><td> '''G''' 2007 </td><td> '''G''' 2006 </td><td> '''G''' 2005
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Bruce Merry </td><td> South Africa </td><td> '''G''' 2001 </td><td> '''G''' 2000 </td><td> '''S''' 1999 </td><td> '''B''' 1998 </td><td> '''B''' 1997 </td><td> '''B''' 1996
</td></tr>
<tr><td> Alex Schwendner </td><td> United States </td><td> '''G''' 2005 </td><td> '''G''' 2003 </td><td> '''S''' 2004 </td><td> '''S''' 2002
</td><td> </td><td> </td></tr>
<tr><td> Wolfgang Thaller </td><td> Austria </td><td> '''G''' 1997 </td><td> '''G''' 1996 </td><td> '''S''' 1999 </td><td> '''S''' 1998
</td><td> </td><td> </td></tr>
<tr><td> Victor Bargachev </td><td> Russia </td><td> '''G(I)''' 1995 </td><td> '''G(I)''' 1994 </td><td> '''S''' 1993
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Mihai Patrascu </td><td> Romania </td><td> '''G(II)''' 2001 </td><td> '''G''' 2000 </td><td> '''S''' 1999
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Roman Pastoukhov </td><td> Russia </td><td> '''G''' 2000 </td><td> '''G(II)''' 1999 </td><td> '''S''' 2001
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Piotr Zieliński </td><td> Poland </td><td> '''G''' 1997 </td><td> '''G(III)''' 1996 </td><td> '''S''' 1995
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Miroslav Dudik </td><td> Slovakia </td><td> '''G''' 1997 </td><td> '''G''' 1996 </td><td> '''S''' 1995
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Richard Kralovic </td><td> Slovakia </td><td> '''G''' 1999 </td><td> '''G''' 1998 </td><td> '''S''' 1997
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Tomasz Czajka </td><td> Poland </td><td> '''G''' 2000 </td><td> '''G''' 1999 </td><td> '''S''' 1998 </td><td>
</td><td> </td><td> </td></tr>
<tr><td> Petr Mitrichev </td><td> Russia </td><td> '''G''' 2002 </td><td> '''G''' 2000 </td><td> '''S''' 2001
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Luka Kalinovcic </td><td> Croatia </td><td> '''G''' 2004 </td><td> '''G''' 2003 </td><td> '''S''' 2002
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Rostislav Rumenov </td><td> Bulgaria </td><td> '''G''' 2007 </td><td> '''G''' 2006 </td><td> '''S''' 2005
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Tzvetomir Petrov </td><td> Bulgaria </td><td> '''G(I)''' 1990 </td><td> '''G''' 1993 </td><td> '''B''' 1991
</td><td> </td><td> </td><td> </td></tr>
<tr><td> Tero Karras </td><td> Finland </td><td> '''G''' 2000 </td><td> '''S''' 1999 </td><td> '''S''' 1998 </td><td> '''S''' 1997
</td><td> </td><td> </td></tr>
<tr><td> Nikolai Dourov </td><td> Russia </td><td> '''G''' 1996 </td><td> '''S''' 1998 </td><td> '''S''' 1997 </td><td> '''S''' 1995
</td><td> </td><td> </td></tr>
<tr><td> Hu Weidong </td><td> China </td><td> '''G(I)''' 2005 </td><td> '''G(II)''' 2004
</td><td> </td><td> </td><td> </td><td> </td></tr>
<tr><td> Chen Hong </td><td> China </td><td> '''G(I)''' 1999 </td><td> '''G(II)''' 2000
</td><td> </td><td> </td><td> </td><td> </td></tr>
</table>
</center>
== See also ==
* [[International science olympiad]]
* [[ACM International Collegiate Programming Contest]]
* [[Central European Olympiad in Informatics]]
== External links ==
*[http://www.ioinformatics.org/ IOI International Committee Website]
*[http://olympiads.win.tue.nl/ioi/ IOI Secretariat Website]
*[http://www.ioi2004.org IOI 2004 (held in Athens,Greece) website]
*[http://www.ioi2005.pl/ IOI 2005 Website]
*[http://www.hsin.hr/ioi2007/ IOI 2007 Website]
*[http://www.ioi2008.org/ IOI 2008 Website]
*[http://www.tobias-thierer.de/olympiads-photos.html Photos] from some former Informatics Olympiads.
[[Category:Olympiads]]
[[Category:Programming contests]]
[[cs:IOI]]
[[de:Internationale Informatik-Olympiade]]
[[es:Olimpiada Internacional de Informática]]
[[fa:المپیاد بینالمللی کامپیوتر]]
[[fr:Olympiades internationales d'informatique]]
[[ko:국제 정보 올림피아드]]
[[hr:Međunarodna informatička olimpijada]]
[[it:Olimpiadi internazionali dell'informatica]]
[[ja:国際情報オリンピック]]
[[pl:Międzynarodowa Olimpiada Informatyczna]]
[[pt:Olimpíada Internacional de Informática]]
[[ro:Olimpiada Internaţională de Informatică]]
[[ru:Международная олимпиада по информатике]]
[[fi:Kansainväliset tietotekniikkaolympialaiset]]
[[th:การแข่งขันคอมพิวเตอร์โอลิมปิกระหว่างประเทศ]]
[[vi:Olympic tin học quốc tế]]
[[tk:Halkara Informatika Olimpiyadasy]]
[[zh:国际信息学奥林匹克]]