Problems from Waterloo Programming Contest 2007-09-23

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Carpool 324 58 18% 0.00 55 42 76% 5.9
Exchange Rates 350 97 28% 0.00 108 89 82% 5.6
Pseudoprime numbers 1295 538 42% 0.00 470 417 89% 3.4