International Olympiad in Informatics
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "International_Olympiad_in_Informatics".

The International Olympiad in Informatics (IOI) is an annual informatics 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).

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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, C++ or 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 cases. 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).

The competition room at the IOI 2006
The competition room at the IOI 2006
In front of the competition room at the IOI 2007
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

Multiple IOI winners

The following is a list of the top 21 performers in the history of the IOI. 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
 Filip Wolski   Poland   G(I) 2006   G 2005   G 2004   G 2003


 		      
 Reid Barton   United States   G(I) 2001   G 2000      


 		      
 Martin Pettai   Estonia   G 2002   G 2001   G 2000   S 1999        
 Andrzej Gasienica-Samek   Poland   G 1999   G 1998   G 1997   S 1996        
 Vladimir Martianov   Russia   G 1999   G(I) 1998   G(I) 1997           
 Martin Mares   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           
 Bruce Merry   South Africa   G 2001   G 2000    S 1999    B 1998    B 1997    B 1996  
 Alex Schwendner   United States   G 2005   G 2003    S 2004    S 2002        
 Wolfgang Thaller   Austria   G 1997   G 1996   S 1999   S 1998        
 Victor Bargachev   Russia   G(I) 1995   G(I) 1994   S 1993           
 Mihai Patrascu   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 Dudik   Slovakia   G 1997   G 1996    S 1995           
 Richard Kralovic   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 Kalinovcic   Croatia   G 2004   G 2003    S 2002           
 Rostislav Rumenov   Bulgaria   G 2007   G 2006    S 2005           
 Henadzi Karatkevich   Belarus   G 2008   G 2007    S 2006           
 Goran Žužić   Croatia   G 2008   G 2007    B 2006          

See also

External links
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