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JDK 1.4 is on the top at my list for Christmas...

I've tried to submit problem 197 (Cubes) 10 times just getting 'compile error'. I've tried to remove the HashSet, to remove the StringBuffer and modified the type casting from int to char. What could be wrong? It surely can't be the switch-statement, can it?

Here's the code:

[java]
import java.io ...