Problems from Waterloo Programming Contest 2007-09-23

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Carpool 313 55 18% 0.00 51 40 78% 6.4
Exchange Rates 317 95 30% 0.00 102 87 85% 4.5
Pseudoprime numbers 1155 470 41% 0.00 411 363 88% 3.5