Similar to other solutions, but using grep and sort:
@array = qw (aa bb cc aa aa cc cc dd aa aa);
grep {$count{$_}++} @array;
print "$_ - $count{$_}\n" foreach sort keys %count;

[download]
Or search for "count unique array" in Super Search :-)

In reply to Re: Counting unique elements in an array by tirwhan
in thread Counting unique elements in an array by Anonymous Monk

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