Problems from Waterloo Programming Contest 2004-09-25

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Antiarithmetic?	0.01	258	3147	584	19%	6.9Hard	en
Help!	0.00	371	4929	698	14%	5.5Hard	en
Test	0.00	880	553	212	38%	4.2Medium	en
Treequivalence	0.01	961	163	30	18%	7.8Hard	en