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 29
addition 19
fizzbuzz 18
3nplus1 17
exam 17

Most Submitted Problems (Past Week)
Problem Submissions
helloworld 77
catfight 66
addition 64
party_noi 62
fizzbuzz 57