Problems from Waterloo Programming Contest 2004-09-25

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Antiarithmetic? 2316 435 19% 0.01 509 285 56% 7.8
Help! 3531 505 14% 0.00 436 304 70% 6.2
Test 182 83 46% 0.00 74 54 73% 6.3
Treequivalence 91 29 32% 0.00 30 22 73% 7.5