The problems are grouped into four categories: algebra (A), combinatorics (C), geometry
(G), and number theory (N). Within each category, the problems are arranged in ascending
order of estimated difficulty, although of course it is very hard to judge this accurately.
http://ifile.it/v0uopha/imo_2003.pdf
http://rapidshare.com/files/232423858/imo_2003.rar
