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Tasks of Past IOIs

Here is the list of competition tasks for past IOIs:

1. IOI1989 11. IOI1999
2. IOI1990 12. IOI2000
3. IOI1991 13. IOI2001
4. IOI1992 14. IOI2002
5. IOI1993
15. IOI2003
6. IOI1994 16. IOI2004
7. IOI1995 17. IOI2005
8. IOI1996 18. IOI2006
9. IOI1997 19. IOI2007
10. IOI1998 20. IOI2008
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