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.

1900 problems

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Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
helloworld 20
minimum 19
addition 19
maximum 19
flamethrower 17

Most Submitted Problems (Past Week)
Problem Submissions
typo 44
minimum 43
addition 43
cuberoot 43
prefixsums 42