Problems from Waterloo Programming Contest 2004-09-25

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Antiarithmetic? 2121 404 19% 0.01 459 261 57% 7.6
Help! 3150 453 14% 0.00 389 270 69% 6.3
Test 123 61 50% 0.00 49 37 76% 6.6
Treequivalence 57 20 35% 0.00 24 19 79% 6.4