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.

1997 problems

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railway 13
splithunny 6
party 6
foreveralone 6
hacking 5

Most Submitted Problems (Past Week)
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railway 58
veryeasymath 35
spellofweakness 28
stickytape 24
hungrycats 22