January 28, 2013 at 8:00 AM (UTC)
Five for week 20 (2012-2013)
Upsolve
Jan 28, 2013
Ended 13 years ago
Unknown
5.5
days
5
Problems
- Start time
- January 28, 2013 at 8:00 AM (UTC)
- End time
- February 2, 2013 at 8:00 PM (UTC)
- Format
- IOI, 5 problems, 5.5 days