Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Ideas	0.14	983	22	13	59%	6.2Hard	en
Shopping	0.15	811	208	180	87%	4.7Medium	en
Stack Machine	0.00	1391	29	18	62%	6.3Hard	en
Tunnelling the Earth	0.00	253	142	128	90%	2.6Easy	en