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 11
fibo 8
lunchbox 8
greeting 7
maximum 7

Most Submitted Problems (Past Week)
Problem Submissions
flip 39
nycoordinates 36
fibo 30
fun 30
lunchbox 30