Welcome to Codebreaker!

Codebreaker is the official platform for Singapore Informatics Olympiad training and contests. We have run selection for the International Olympiad in Informatics for the delegations of Singapore and Indonesia, as well as countless official national and school training programmes.

1866 problems

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Most Attempted Problems (Past Week)
Problem Users
helloworld 16
sadtrainer 14
lunchbox 13
contestcalc 12
GSS 11

Most Submitted Problems (Past Week)
Problem Submissions
lunchbox 63
helloworld 59
sadtrainer 53
bananasmoothie 45
foodchain 45