Honorary patronage
President of the Republic of Poland, Aleksander Kwaśniewski

About IOI

The International Olympiad in Informatics (IOI) is one of the most recognized computer science competitions in the world. The competition tasks are of algorithmic nature; however, the contestants have to show such basic IT skills as problem analysis, design of algorithms and data structures, programming and testing. The winners of the IOI belong to the best young computer scientists in the world.


This year's International Olympiad in Informatics will be accompanied by an Online Contest hosted at http://contest.ioi2005.pl.

Posted tasks will be exactly the ones used during the real competition and will be graded using the same test data.

Everybody is welcome to participate. If you want more details, visit http://contest.ioi2005.pl.

The IOI is one of the six inter­na­tio­nal science Olympiads. The others are: mathematics (IMO), physics (IPhO), chemistry (IChO), astronomy (IAO) and biology (IBO). The official IOI web site is:


The first IOI was organized in Pravetz, Bulgaria, in 1989, with the assistance of UNESCO. The Olympiads in the 21'st century have taken place in Tampere, Finland (2001), Yong–In, South Korea (2002), Kenosha, Wisconsin, USA (2003), Athens, Greece (2004).

Our postcard

JPG big (804kB) small (131kB)

The 17'th International Olympiad in Informatics took place in Nowy Sącz, Poland. Over 70 countries participated.