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.

1899 problems

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Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
helloworld 19
maximum 15
flamethrower 15
addition 15
fizzbuzz 15

Most Submitted Problems (Past Week)
Problem Submissions
prefixsums 62
goodprogrammer 59
lightningrod 49
leftright 41
minimum 40