Problems from Waterloo Programming Contest 2004-09-25

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Antiarithmetic?	0.01	258	3236	600	19%	6.7Hard	en
Help!	0.00	371	5019	710	14%	5.5Hard	en
Test	0.00	880	607	235	39%	4.1Medium	en
Treequivalence	0.01	961	194	31	16%	8.7Hard	en