Inspired by the fact that 2013 is the first year since 1987 which has four unique digits, what's your best code to
determine the number of unique digits in a number?
Here's what I ended up with, skipping the %unique method:
$y = 2013;
($y = join('',sort(split(//,$y)))) =~ tr/0-9//s;
print "unique digits: " . length($y) . $/;
I'm sure there's something smarter.
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