Problems from Waterloo Programming Contest 2010-07-10

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Ideas 50 6 12% 0.18 9 5 56% 7.3
Shopping 239 57 24% 0.21 34 28 82% 6.7
Stack Machine 63 16 25% 0.02 11 7 64% 6.6