Problems from CTU Open 2009

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Arable Area 340 75 22% 0.04 74 46 62% 8.2
Digital display 2647 902 34% 0.00 833 746 90% 2.4
Peculiar primes 711 214 30% 0.01 196 147 75% 5.9