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.

1849 problems

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Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
helloworld 67
addition 34
problemsetter 31
typoswap 30
slimes 25

Most Submitted Problems (Past Week)
Problem Submissions
helloworld 197
addition 140
problemsetter 122
fibo 122
fraud 121