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.

1124 problems

All problems

151000 submissions

Recent submissions

1466 users

Rankings

Public Contests
Traffic (CloudFlare)

Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
bracketex 6
collectmushrooms6 5
psle 5
evenorodd 5
xorb 5

Most Submitted Problems (Past Week)
Problem Submissions
ccs 36
pressstart 35
wabot 31
dna_ioi 28
4russians 28