Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Ideas	0.18	983	68	9	13%	7.2Hard	en
Shopping	0.15	811	1299	245	19%	5.0Medium	en
Stack Machine	0.00	1391	182	41	23%	6.7Hard	en
Tunnelling the Earth	0.00	273	262	125	48%	2.9Medium	en