Problems from Waterloo Programming Contest 2004-09-25

Name
Fastest
Shortest
Authors
Full Solves
Ratio
Difficulty
Languages
Antiarithmetic?0.0125867841561%6.7Harden
Help!0.0037158842071%5.6Harden
Test0.0088020616078%4.0Mediumen
Treequivalence0.01961452453%8.0Harden