Problems from Waterloo Programming Contest 2010-07-10

Name
Fastest
Shortest
Total
Acc.
Ratio
Difficulty
Languages
Ideas0.14983731216%7.2Harden
Shopping0.15811129924519%5.0Mediumen
Stack Machine0.0013911824123%6.7Harden
Tunnelling the Earth0.0027326412748%2.9Mediumen