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
exponentiate 31
helloworld 29
binarycoins 29
addition 22
samelength 20

Most Submitted Problems (Past Week)
Problem Submissions
telepathy 207
becomingred 157
binarycoins 133
subtaskstitching 125
primefactorization 117