Problems from Waterloo Programming Contest 2004-09-25

Name
Fastest
Shortest
Total
Acc.
Ratio
Difficulty
Languages
Antiarithmetic?0.01258320759719%6.8Harden
Help!0.00371499670814%5.6Harden
Test0.0088059823038%4.1Mediumen
Treequivalence0.019611873117%8.6Harden