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
ny_mathexam 39
nylunchtime 36
helloworld 17
goodseq 17
addition 17

Most Submitted Problems (Past Week)
Problem Submissions
addition 77
pigeonhole 70
exam 67
ny_mathexam 55
goodseq 48