Problems from Waterloo Programming Contest 2004-09-25

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Antiarithmetic?	0.01	258	3167	588	19%	6.9Hard	en
Help!	0.00	371	4955	701	14%	5.6Hard	en
Test	0.00	880	577	223	39%	4.2Medium	en
Treequivalence	0.01	961	168	30	18%	7.9Hard	en