Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Ideas	0.14	983	86	13	15%	7.2Hard	en
Shopping	0.15	811	1503	297	20%	4.8Medium	en
Stack Machine	0.00	1391	194	41	21%	6.7Hard	en
Tunnelling the Earth	0.00	273	299	143	48%	2.9Medium	en