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
helloworld 41
addition 35
fizzbuzz 34
exam 23
3nplus1 23

Most Submitted Problems (Past Week)
Problem Submissions
WA1 94
fizzbuzz 94
addition 91
dkdk 86
prime 75