Problems from CTU Open 2009

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Arable Area 294 65 22% 0.04 67 42 63% 8.1
Digital display 2114 725 34% 0.00 658 590 90% 2.4
Peculiar primes 624 189 30% 0.01 174 129 74% 5.9