Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:
OK, I have a nice, easy question that will let you show off
your cleverness (I could do this easily by brute force, but
I want some efficiency, as I will have to do it thousands of
times).
I have some random strings (actually hex strings, but I would like to see a more general case). I want to find the number of unique characters in the string.
f(0101010101) should return 2
f(1234567812) should return 8
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