Problems from CTU Open 2009

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Arable Area 237 57 24% 0.04 59 37 63% 7.5
Digital display 1541 536 35% 0.00 477 425 89% 2.6
Peculiar primes 526 167 32% 0.01 154 113 73% 6.1