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.

1967 problems

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Most Attempted Problems (Past Week)
Problem Users
helloworld 28
addition 25
platonic 18
platonic2 16
psle 15

Most Submitted Problems (Past Week)
Problem Submissions
beareatrabbit 78
isitpriming 73
platonic5 72
addition 72
psle 69