Problems from Waterloo Programming Contest 2004-09-25

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Antiarithmetic?	0.01	258	3035	565	19%	6.9Hard	en
Help!	0.00	371	4427	644	15%	5.8Hard	en
Test	0.00	880	479	188	39%	4.5Medium	en
Treequivalence	0.01	961	146	27	18%	7.9Hard	en