Problems from Waterloo Programming Contest 2004-09-25

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Antiarithmetic? 2179 419 19% 0.01 475 271 57% 7.6
Help! 3162 455 14% 0.00 391 272 70% 6.4
Test 133 67 50% 0.00 56 42 75% 6.7
Treequivalence 89 28 31% 0.00 28 21 75% 7.3