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
problemsetter 19
helloworld 17
goodprogrammer 17
addition 14
exam 11

Most Submitted Problems (Past Week)
Problem Submissions
goodprogrammer 126
add1_easy 85
spellofweakness 69
prime 54
foodchain 53