Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Ideas	0.14	983	94	14	15%	6.7Hard	en
Shopping	0.15	811	1513	299	20%	4.8Medium	en
Stack Machine	0.00	1391	202	41	20%	6.7Hard	en
Tunnelling the Earth	0.00	253	317	150	47%	2.7Easy	en