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.

1324 problems

All problems

255000 submissions

Recent submissions

2320 users

Rankings

Public Contests
Traffic (CloudFlare)

Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
helloworld 28
exam 26
sumint 16
addition 15
maximum 15

Most Submitted Problems (Past Week)
Problem Submissions
exam 81
telepathy 61
curtains 55
psle 54
airplane 53