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
addition 29
helloworld 29
platonic 20
reverse 20
platonic2 18

Most Submitted Problems (Past Week)
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beareatrabbit 113
addition 78
psle 76
platonic5 73
sufferingprogrammer 70