Previous years

The Central European Olympiad in Informatics (CEOI) is an annual informatics competition for secondary school students. Each of the participating central European countries sends a team of up to four contestants, a team leader and a deputy team leader. The contestants compete individually, i.e. a team score is not calculated. Competitors are selected through national computing contests. The contest consists of two days of computer programming, solving problems of an algorithmic nature. The rules and regulations of the contest resemble the rules and regulations of the International Olympiad in Informatics (IOI), which served as a role model for the invention of the more local CEOI. The first CEOI was held in 1994 (Romania, founder of the CEOI), five years after the first IOI. The host city of 19th Central European Olympiad in Informatics is Tata, Hungary.

CEOI 2024	Location: Brno, Czechia, 23 – 29 June, 2023 Participants: Austria,Croatia,Czech Republic, Germany, Hungary, Italy, Poland, Romania,Slovakia, Slovenia, Switzerland, Ukraine Website: https://ceoi2024.fi.muni.cz/
CEOI 2023	Location: Magdeburg, Germany, 13 – 19 August, 2023 Participants: Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia, Israel, Saxony-Anhalt (second host team), Switzerland, Ukraine Website:https://www.ceoi2023.de/
CEOI 2022	Location: Varazdin, Croatia, 24 – 30 July, 2022 Participants: Austria,Croatia,Czech Republic, Germany, Hungary, Italy, Poland, Romania,Slovakia, Slovenia, Switzerland, Ukraine Website: https://hsin.hr/ceoi/
CEOI 2021	Location: Zagreb, Croatia, 1 – 5 September, 2021 Participants: Austria,Croatia,Czech Republic, Germany, Hungary, Italy, Poland, Romania,Slovakia, Slovenia, Switzerland Website: https://hsin.hr/ceoi/
CEOI 2020	Location: Nagykanizsa, Hungary, 23 – 29 August, 2020 Participants: Austria,Croatia,Czech Republic, Germany, Hungary, Italy, Lithuania, Poland, Romania, Slovakia, Slovenia, Switzerland, The Netherlands Website: http://ceoi2020.inf.elte.hu/
CEOI 2019	Location: Bratislava, Slovakia, July 23 – July 29, 2019 Participants: Armenia, Austria, Croatia,Czech Republic,Germany, Hungary, Italy, Poland ,Romania, Slovakia, Slovenia, Switzerland, Ukraine Website: http://oi.sk/ceoi2019/
CEOI 2018	Location: Warsaw, Poland, 12 – 18 August 2018 Participants: Austria, Azerbaijan, Croatia, Czech Republic, Georgia, Germany, Hungary, Italy, Poland, Romania, Slovakia, Slovenia, Switzerland Website: https://ceoi2018.pl
CEOI 2017	Location: Ljubljana, Slovenia, 10 – 15 July 2017 Participants: Austria, Azerbaijan, Croatia, Czech Republic, Georgia, Germany, Hungary, Israel, Italy, Poland, Romania, Slovakia, Switzerland, Slovenia Website: https://ceoi2017.acm.si
CEOI 2016	Location: Piatra Neamț, Romania, 18 – 23 July 2016 Participants: Bulgaria, Croatia, Czech Republic, Georgia, Germany, Hungary, Moldova, Poland, Romania, Slovakia, Slovenia, Switzerland Website: http://www.ceoi2016.ro/
CEOI 2015	Location: Brno, Czech Republic, 29 June – 4 July 2015 Participants: Croatia, Czech Republic, Georgia, Germany, Hungary, Poland, Romania, Slovakia, Slovenia,Switzerland Website: http://ceoi2015.fi.muni.cz
CEOI 2014	Location: Jena, Thuringia, Germany, 18-24 June 2014 Participants: Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia,Switzerland Website: http://ceoi2014.informatik-olympiade.de
CEOI 2013	Location: Primosten, Croatia, 13-19 October 2013 Participants: Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia,Switzerland Website: http://ceoi2013.hsin.hr/
CEOI 2012	Location: Tata, Hungary, 7-13 July 2012 Participants: Bulgaria, Croatia, Czech Republic, Germany, Hungary, Israel, Poland, Romania, Slovakia, Slovenia,Switzerland, The Netherlands Website: http://ceoi2012.elte.hu/
CEOI 2011	Location: Gdynia, Poland, 7-12 July 2011 Participants: Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia,Switzerland Website: http://ceoi2011.mimuw.edu.pl/
CEOI 2010	Location: Košice, Slovakia, 12-19 July 2010 Participants: Bulgaria, Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Switzerland Website: http://ceoi2010.ics.upjs.sk/
CEOI 2009	Location: Targu Mures, Romania, 8-14 July 2009 Participants: Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Switzerland, USA, Serbia, Moldova Website: http://www.ceoi2009.ro
CEOI 2008	Location: Dresden, Germany, 6-12 July 2008 Participants: Croatia, Czech Republic, Germany, Hungary, Israel, Poland, Romania, Saxony, Slovakia Website: http://www.ceoi2008.de
CEOI 2007	Location: Brno, Czech Republic, 1-7 July 2007 Participants: Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Czech Republic II, Brno Website: http://www.fi.muni.cz/ceoi/
CEOI 2006	Location: Vrsar, Croatia, 1-8 July 2006 Participants: Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Croatia II, Croatia III Website: http://www.hsin.hr/ceoi2006/
CEOI 2005	Location: Sárospatak, Hungary, 28 July – 5 August, 2005 Participants: Bosnia and Herzegovina, Croatia, Czech Republic, Estonia, France, Germany, Hungary, Poland, Romania, Sárospatak, Slovakia, Spain, The Netherlands Website: http://ceoi.inf.elte.hu/ceoi2005/
CEOI 2004	Location: Rzeszów, Poland, 13-17 July 2004 Participants: Bosnia & Herzegovina, Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia Website: http://www.oi.edu.pl/ceoi2004/
CEOI 2003	Location: Münster, Germany, 5-12 July 2003 Participants: Croatia, Poland, Czech Republic, Slovenia, Netherlands, USA, Hungary, Slovakia, Romania, Iran, Germany, Westphalia Website: http://www.ceoi2003.de/
CEOI 2002	Location: Košice, Slovakia, 30 June – 6 July 2002 Participants: Austria, Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia, The Netherlands, Iran Website: http://web.ics.upjs.sk/ceoi/
CEOI 2001	Location: Zalaegerszeg, Hungary, 10-17 August 2001 Participants: Austria, Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia, Estonia, Finland, Italy, The Netherlands Website: http://ceoi.inf.elte.hu/ceoi2001/
CEOI 2000	Location: Cluj-Napoca, Romania, 24-31 August 2000 Participants: Croatia, Czech Republic, Germany, Hungary, Moldova, Netherlands, Poland, Romania, Slovakia, Slovenia, USA
CEOI 1999	Location: Brno, Czech Republic, 2-9 September 1999 Participants: Bosnia-Herzegovina, Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia, USA Website: http://www.fi.muni.cz/ceoi1999/
CEOI 1998	Location: Zadar, Croatia, 20-27 May 1998 Participants: Bosnia-Herzegovina, Croatia, Czech Republic, Germany, Hungary, Poland, Romania, Slovakia, Slovenia
CEOI 1997	Location: Nowy Sącz, Poland, 17-24 July 1997 Participants: Belarus, Croatia, Estonia, Germany, Hungary, Latvia, Lithuania, Netherlands, Poland, Romania, Slovakia, Ukraine, USA, Yugoslavia
CEOI 1996	Location: Bratislava, Slovak Republic, 9-13 October 1996 Participants: Croatia, Czech Republic, Hungary, Poland, Romania, Slovakia, Slovenia
CEOI 1995	Location: Szeged, Hungary, 29 May – 3 June 1995 Participants: Belarus, Croatia, Czech Republic, Estonia, Hungary, Lithuania, Poland, Romania, Slovakia, Ukraine, Yugoslavia Website: http://ceoi.inf.elte.hu/95 /
CEOI 1994	Location: Cluj-Napoca, Romania, 27-31 May 1994 Participants: Croatia, Czech Republic, Hungary, Moldova, Poland, Romania, Turkey, Yugoslavia