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
helloworld 28
exam 26
sumint 16
addition 15
maximum 15

Most Submitted Problems (Past Week)
Problem Submissions
exam 81
telepathy 61
curtains 55
psle 54
airplane 53