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.

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Most Attempted Problems (Past Week)
Problem Users
rabbitjoke 36
sort2 29
mao2 27
helloworld 24
eatingkids 23

Most Submitted Problems (Past Week)
Problem Submissions
eatingkids 318
mao2 285
sort2 200
mathematics 96
rabbitjoke 72