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
uniquenumbers 20
addition 19
ccs 17
countalp 16

Most Submitted Problems (Past Week)
Problem Submissions
sufferingprogrammer 113
addition 103
helloworld 84
squarerect 67
ccs 57