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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maximum 18
addition 17
helloworld 17
fizzbuzz 17
paint 15

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goodprogrammer 72
prefixsums 59
gcd 46
3nplus1 43
swapsort 41