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.

1999 problems

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Most Attempted Problems (Past Week)
Problem Users
helloworld 13
addition 13
exam 13
sumint 13
prefixsums 11

Most Submitted Problems (Past Week)
Problem Submissions
guessproblem 130
firstabc 62
3nplus1 56
prime 51
cuberoot 43