If the sets of integers and/or strings are unique, that is w/o repetitions AND if you don't care about the order, then better use a hash to hold the data.

your problem could easily be solved with:

%hash=@array;
@ints = keys %hash;
@strs = values %hash;
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for the second case (unique strings) use reverse

%hash= reverse @array;
@strs = keys %hash;
@ints = values %hash;
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test in debugger:

  DB<103> %hash = reverse qw/1 A 2 B 3 C 4 D 5 E/
 => ("E", 5, "D", 4, "C", 3, "B", 2, "A", 1)
 
  DB<104> keys %hash
 => ("A", "C", "D", "B", "E")
 
  DB<105> values %hash
 => (1, 3, 4, 2, 5)
[download]