Problems from Waterloo Programming Contest 2007-09-23

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Carpool 355 61 17% 0.00 59 45 76% 6.7
Exchange Rates 395 113 29% 0.00 123 103 84% 5.2
Pseudoprime numbers 1785 733 41% 0.00 642 561 87% 3.6