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.

1862 problems

All problems

660000 submissions

Recent submissions

6444 users

Rankings

Public Contests
Traffic (CloudFlare)

Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
potatosalad 19
descsort 17
helloworld 15
gcd 15
addition 13

Most Submitted Problems (Past Week)
Problem Submissions
potatosalad 52
guessproblem 39
sandd 39
helloworld 38
fibo 37