Tasks archive
1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
| CEOI’94, Cluj, Romania (27 – 31 May 1994) | |
| CEOI’95, Szeged, Hungary (29 May – 3 June 1995) | |
| CEOI’96, Bratislava, Slovak Republic (9 – 13 October 1996) | |
| CEOI’97, Nowy Sacz, Poland (17 – 24 July 1997) |
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| CEOI’98, Zadar, Croatia (20 – 27 May 1998) | |
| CEOI’99, Brno, Czech Republic (2-9 September 1999) | |
| CEOI2000, Cluj, Romania (24-31 August 2000) | |
| CEOI’2001, Zalaegerszeg, Hungary (10 – 17 August 2001) | |
| CEOI2002, Kosice, Slovakia (30 June -6 July 2002) | |
| CEOI2003, Münster, Germany (5 -12 July 2003) | |
| CEOI2004, Rzeszów, Poland (13 July -17 July 2004) | |
| CEOI’2005, Sárospatak, Hungary (28 July – 4 August 2005) | |
| CEOI’2006, Vrsar, Croatia (1 – 8 July 2006) | |
| CEOI2007, Brno, Czech Republic (1 – 7 July 2007) | |
| CEOI2008, Dresden, Germany, 6-12 July 2008 | |
| CEOI2009, Târgu Mureş, Romania, 8-14 July 2009 | |
| CEOI2010, Kosice, Slovakia, , 12-19 July 2010 | |
| CEOI2011, Gdynia, Poland, 7-12 July 2011 |
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| CEOI2012, Tata, Hungary, 7-13 July 2012 | |
| CEOI2013, Primosten, Croatia, 13-19 October 2013 | |
| CEOI2014, Jena, Thuringia, Germany, 18-24 June 2014 | |
| CEOI2015, Brno, Czech Republic, 29 June – 4 July 2015 |
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| CEOI2016, Piatra Neamț, Romania, 18-23 July 2016 | |
| CEOI2017, Ljubljana, Slovenia, 10 – 15 July 2017 |
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| CEOI 2018, Warsaw, Poland, 12 – 18 August 2018 |
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| CEOI 2019, Bratislava, Slovakia, 23 – 29 July 2019 |
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| CEOI 2020, Nagykanizsa, Hungary, 23 – 29 August 2020 |
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| CEOI 2021, Zagreb, Croatia, 1 – 5 September 2021 |
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| CEOI 2022, Varazdin, Croatia, 24 – 30 July 2022 |
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| CEOI 2023, Magdeburg, Germany, 13 – 19 August 2023 |
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| CEOI 2024, Brno, Czechia, 23 – 29 June 2024 |