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 17
problemsetter 15
addition 13
goodprogrammer 13
exam 11

Most Submitted Problems (Past Week)
Problem Submissions
goodprogrammer 120
add1_easy 85
spellofweakness 69
foodchain 53
prime 48