Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Ideas	0.14	983	78	13	17%	7.1Hard	en
Shopping	0.15	811	1495	296	20%	4.9Medium	en
Stack Machine	0.00	1391	187	41	22%	6.6Hard	en
Tunnelling the Earth	0.00	273	292	143	49%	2.9Medium	en