International Olympiad in Informatics

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The logo of the International Olympiad in Informatics

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 81 countries in 2012). 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.

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Structure of the competition [edit]

IOI 2009's banner above the competition room

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. The program is graded by being run with secret test data. From 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 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.

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).

The competition room at the IOI 2006
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Back
A bronze medal from IOI 2006 in Mexico
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. Prior to IOI 2010, students who did not receive medals did 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. From IOI 2010, 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.

List of IOI websites and locations [edit]

Multiple IOI winners [edit]

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(II) 2012   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         
 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           
 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              
 Shogo Murai   Japan   G 2012   G 2011    G 2010              
 Alex Schwendner   United States   G 2005   G 2003    S 2004    S 2002           
 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) 1990                 
 Hong Chen   P.R. China   G(II) 2000   G(I) 1999                 
 Johnny Ho   United States   G*(I) 2012   G 2011                 
 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 [edit]

Wikimedia Commons has media related to: International Olympiad in Informatics

References [edit]

External links [edit]

Open-source project for running contests:
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