Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Ideas	0.14	983	100	16	16%	6.6Hard	en
Shopping	0.15	811	1521	301	20%	4.7Medium	en
Stack Machine	0.00	1391	206	41	20%	6.7Hard	en
Tunnelling the Earth	0.00	253	330	152	46%	2.6Easy	en