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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Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
helloworld 15
card 14
brick 13
psle 13
addition 13

Most Submitted Problems (Past Week)
Problem Submissions
rarwall 100
exponentiate 54
prefixsums 54
card 51
lightningrod 48