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.

1383 problems

All problems

311000 submissions

Recent submissions

2899 users

Rankings

Public Contests
Traffic (CloudFlare)

Submissions Per Day
Most Attempted Problems (Past Week)
Problem Users
addition 7
fibo 6
dinowalk 6
helloworld 5
evenorodd 4

Most Submitted Problems (Past Week)
Problem Submissions
oranges2 72
rootedlca 48
supperbox 40
fibo 37
doll_noi 34