Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Ideas	0.14	983	21	12	57%	6.9Hard	en
Shopping	0.15	811	211	184	87%	4.6Medium	en
Stack Machine	0.00	1391	31	21	68%	5.8Hard	en
Tunnelling the Earth	0.00	231	154	139	90%	2.5Easy	en