Here you can find some interesting links

• Polish Olympiad in Informatics
  http://www.oi.edu.pl/
  
  
• International Olympiad in Informatics
  http://olympiads.win.tue.nl/ioi
  
  
• CEOI 2003
  http://www.ceoi2003.de/
  
  
• CEOI 2002
  http://cs.science.upjs.sk/ceoi/
  
  
• CEOI 2001
  http://ceoi.inf.elte.hu/
  
  
• CEOI 2000
  http://ceoi.ubbcluj.ro/
  
  
• CEOI 1999
  http://www.fi.muni.cz/ceoi/
  
  
• CEOI 1998
  http://pubwww.srce.hr/hsin/ceoi98/
  
  
• CEOI 1997
  http://www.mimuw.edu.pl/OI/ceoi97/
  
  
• CEOI 1996
  http://turing.fmph.uniba.sk/www/ceoi/
  
  
• CEOI 1995
  http://ceoi.inf.elte.hu/95/