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%	6.6Hard	en
Shopping	0.15	811	209	182	87%	4.6Medium	en
Stack Machine	0.00	1391	30	19	63%	6.6Hard	en
Tunnelling the Earth	0.00	231	147	133	90%	2.5Easy	en