Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Ideas	0.14	983	115	18	16%	6.1Hard	en
Shopping	0.15	811	1528	302	20%	4.7Medium	en
Stack Machine	0.00	1391	226	42	19%	6.2Hard	en
Tunnelling the Earth	0.00	253	335	155	46%	2.6Easy	en