Problems from Waterloo Programming Contest 2004-09-25

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Antiarithmetic?	0.01	258	3221	597	19%	6.8Hard	en
Help!	0.00	371	5016	709	14%	5.6Hard	en
Test	0.00	880	598	230	38%	4.1Medium	en
Treequivalence	0.01	961	187	31	17%	8.6Hard	en