International Olympiad in Informatics
![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/34/IOI_logo.png/220px-IOI_logo.png)
The International Olympiad in Informatics (IOI) is an annual competitive programming 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 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 in the national teams are selected through national computing contests, such as the Australian Informatics Olympiad, British Informatics Olympiad, and Bundeswettbewerb Informatik (Germany).
The IOI is one of the most prestigious computer science competitions in the world. UNESCO and IFIP are patrons of the International Olympiad in Informatics.
Structure of the competition
On each of the two competition days, the students are typically given four 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, C++ or Pascal) and submit it before the five hour competition time ends. The program is graded by being run with secret test data. For 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. Another type of problem has known inputs which are publicly available already during the five hours of the contest. 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.
IOI 2010 will for the first time have 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.
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 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).
![](https://upload.wikimedia.org/wikipedia/commons/thumb/9/98/IOI_2006_competition_room.png/220px-IOI_2006_competition_room.png)
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. Students who do not receive medals do not have their scores published, making it impossible for a country to be ranked by adding together scores of its competitors unless each wins a medal.
List of IOI websites and locations
IOI 2015 will be held in Kazakhstan, 2015
IOI 2014 will be held in Taiwan , 2014
IOI 2013 will be held in Brisbane, Australia, 2013 [1]
IOI 2012 will be held in Sirmione, Italy, September 23–30, 2012 [2]
IOI 2011 was held in Pattaya, Thailand, July 22–29, 2011 [3]
IOI 2010 was held in Waterloo, Ontario, Canada, August 14–21, 2010 [4] (results)
IOI 2009 was held in Plovdiv, Bulgaria, August 8–15, 2009 [5] (results)
IOI 2008 was held in Cairo, Egypt, August 16–23, 2008 [6] (results)
IOI 2007 was held in Zagreb, Croatia, August 15–22, 2007 [7] (results)
IOI 2006 was held in Mérida, Yucatán, Mexico, August 13–20, 2006
IOI 2005 was held in Nowy Sącz, Poland, August 18–25, 2005 [8] (results)
IOI 2004 was held in Athens, Greece, September 11–18, 2004 [9] (results)
IOI 2003 was held in Kenosha, Wisconsin, USA, August 16–23, 2003 [10] (results)
IOI 2002 was held in Yong-In, Korea Rep., August 18–25, 2002 [11]
IOI 2001 was held in Tampere, Finland, July 14–21, 2001 [12]
IOI 2000 was held in Beijing, China, September 23–30, 2000
IOI 1999 was held in Antalya-Belek, Turkey, October 9–16, 1999 [13]
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 [14]
IOI 1995 was held in Eindhoven, The Netherlands, June 26 – July 3, 1995 [15]
IOI 1994 was held in Haninge, Sweden, July 3–10, 1994
IOI 1993 was held in Mendoza, Argentina, October 16–25, 1993 [16]
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, Soviet Union, July 15–21, 1990
IOI 1989 was held in Pravetz, Bulgaria, May 16–19, 1989.
Multiple IOI winners
The following is a list of the top performers in the history of the IOI. The * sign indicates a perfect score, a rare achievement in IOI history. Also, First (I), second (II) and third (III) places among gold medalists are indicated where appropriate. This list includes only those countries where the national selection contest allows the same participant to go multiple times to the IOI.
Name | Team | Years | |||||
---|---|---|---|---|---|---|---|
Gennady Korotkevich | Belarus | G*(I) 2011 | G(I) 2010 | G(I) 2009 | G 2008 | G 2007 | S 2006 |
Filip Wolski | Poland | G(I) 2006 | G 2005 | G 2004 | G 2003 | ||
Martin Pettai | Estonia | G 2002 | G 2001 | G 2000 | S 1999 | ||
Andrzej Gąsienica-Samek | Poland | G 1999 | G 1998 | G 1997 | S 1996 | ||
Vladimir Martianov | Russia | G 1999 | G(I) 1998 | G(I) 1997 | |||
Martin Mareš | Czech Republic | G 1995 | G 1994 | G 1993 | |||
John Pardon | United States | G 2007 | G 2006 | G 2005 | |||
Marcin Andrychowicz | Poland | G 2008 | G 2007 | G 2006 | |||
Neal Wu | United States | G 2010 | G 2009 | G 2008 | |||
Alex Schwendner | United States | G 2005 | G 2003 | S 2004 | S 2002 | ||
Rumen Hristov | Bulgaria | G 2011 | G(II) 2010 | S 2009 | S 2008 | ||
Wolfgang Thaller | Austria | G 1997 | G 1996 | S 1999 | S 1998 | ||
Bruce Merry | South Africa | G 2001 | G 2000 | S 1999 | B 1998 | B 1997 | B 1996 |
Goran Žužić | Croatia | G 2008 | G 2007 | S 2009 | B 2006 | ||
Victor Bargachev | Russia | G(I) 1995 | G(I) 1994 | S 1993 | |||
Mihai Pătraşcu | Romania | G(II) 2001 | G 2000 | S 1999 | |||
Roman Pastoukhov | Russia | G 2000 | G(II) 1999 | S 2001 | |||
Piotr Zieliński | Poland | G 1997 | G(III) 1996 | S 1995 | |||
Miroslav Dudík | Slovakia | G 1997 | G 1996 | S 1995 | |||
Richard Královič | Slovakia | G 1999 | G 1998 | S 1997 | |||
Tomasz Czajka | Poland (1998, 2000), United Kingdom (1999) | G 2000 | G 1999 | S 1998 | |||
Petr Mitrichev | Russia | G 2002 | G 2000 | S 2001 | |||
Luka Kalinovčić | Croatia | G 2004 | G 2003 | S 2002 | |||
Rostislav Rumenov | Bulgaria | G 2007 | G 2006 | S 2005 | |||
Vladislav Epifanov | Russia | G 2008 | G 2007 | S 2009 | |||
Cosmin Gheorghe | Romania | G 2009 | G 2008 | S 2007 | |||
Pasin Manurangsi | Thailand | G 2011 | G 2010 | S 2009 | |||
Wenyu Cao | United States | G 2011 | G 2010 | S 2009 | |||
Tzvetomir Petrov | Bulgaria | G(I) 1990 | G 1993 | B 1991 | |||
David Arthur | Canada | G(II) 2000 | G 1999 | B 1998 | |||
Janis Sermulins | Latvia | G 1999 | G(II) 1997 | B 1998 | |||
Teodor Tonchev | Bulgaria | G(I) 1989 | G(III) 2001 | ||||
Hong Chen | P.R. China | G(II) 2000 | G(I) 1999 | ||||
Reid Barton | United States | G(I) 2001 | G 2000 | ||||
Kazuhiro Hosaka | Japan | G(II) 2009 | G 2008 | ||||
Velin Tzanov | Bulgaria | G(III) 2002 | G 2001 |
See also
- International Science Olympiad
- ACM International Collegiate Programming Contest
- Central European Olympiad in Informatics
- Online judge
![](https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
External links
- IOI International Committee Website
- IOI Secretariat Website
- IOI 2004 (held in Athens,Greece) website
- IOI 2005 Website
- IOI 2007 Website
- IOI 2009 Website
- IOI 2010 Website
- Photos from some former Informatics Olympiads.
- IOI 2009 Results
- IOI 2011 Website
- IOI 2012 Website
Open-source project for running contests:
- Contest Management System Open-source tool in Python to run and manage a programming contest on a server [IOI2012].