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
lunchbox 27
bananasmoothie 23
helloworld 22
addition 20
boxispull 19

Most Submitted Problems (Past Week)
Problem Submissions
nicewelltakethat 108
bananasmoothie 88
lunchbox 85
plantingpotatoes2 79
addition 64