Internet online contest series
Over the next six months we will organize six online contests as a warm-up for the 2023 season of high school programming competitions. Everyone is welcome to participate!
Each contest will be three hours long and will feature five tasks. The contestants will also have full feedback with at most 50 submissions per task. The tasks will be of widely varying difficulty; we hope that many beginner or up-and-coming contestants will participate, as well as the more experienced ones.
The first contest will be held on Saturday, November 5, starting at 14:00 (GMT/UTC). You may use Python, Pascal, C/C++ or Java as your programming language of choice.
Instructions, problems and the contest system will be located at
You can find problems, test data and solutions from previous Croatian competitions in informatics in the COCI 2006/2007 Archive, COCI 2007/2008 Archive, COCI 2008/2009 Archive, COCI 2009/2010 Archive, COCI 2010/2011 Archive, COCI 2011/2012 Archive, COCI 2012/2013 Archive, COCI 2013/2014 Archive, COCI 2014/2015 Archive, COCI 2015/2016 Archive, COCI 2016/2017 Archive, COCI 2017/2018 Archive, COCI 2018/2019 Archive, COCI 2019/2020 Archive, COCI 2020/2021 Archive, COCI 2021/2022 Archive and here.
Feel free to e-mail us at for any and all additional information.
Scientific Committee
Martina Licul and Vito Anić, chairpersons
Nikola Dmitrović
Gabrijel Jambrošić
Krešimir Nežmah
Ivan Paljak
Patrick Pavić
Evaluation and Technical Committee
Matej Ferenčević
Project Manager
Krešimir Malnar