Problems from Waterloo Programming Contest 2004-09-25

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Antiarithmetic?	0.01	258	3064	579	19%	6.8Hard	en
Help!	0.00	371	4760	669	14%	5.4Medium	en
Test	0.00	880	522	200	38%	4.5Medium	en
Treequivalence	0.01	961	146	27	18%	7.9Hard	en