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.

1445 problems

All problems

358000 submissions

Recent submissions

3269 users


Public Contests
Traffic (CloudFlare)

Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
ippt 103
staircase 93
monsters 86
flipcards 75
breakfast 64

Most Submitted Problems (Past Week)
Problem Submissions
monsters 552
flipcards 477
helloworld 385
flip 359
ippt 302