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 21
numbergame 20
belittle 20
cny 18
addition 16

Most Submitted Problems (Past Week)
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nostatement 277
firefighting 103
fraud 96
cny 62
fibo 58