Problems from Waterloo Programming Contest 2010-07-10

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Ideas	0.18	983	57	9	16%	7.2Hard	en
Shopping	0.15	811	1306	244	19%	5.3Medium	en
Stack Machine	0.02	1391	98	24	24%	6.3Hard	en
Tunnelling the Earth	0.00	293	229	112	49%	3.6Medium	en