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
cooperation2 18
addition 17
physics 16
maximum 15
sumint 15

Most Submitted Problems (Past Week)
Problem Submissions
economics 238
physics 136
cooperation2 124
expansion 85
problemsetter 77