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
adjmatrix 14
adjlist 12
party 8
isitpriming 8
helloworld 8

Most Submitted Problems (Past Week)
Problem Submissions
isitpriming 69
lunchbox 56
minimum 36
party 32
exam 31