First I'd like to say that this is pretty clever:
foreach my $e (@array1, @array2) {
$union{$e}++ && $intersect{$e}++
}
To solve your problem, just use an array of references to your set arrays:
my @sets = (\@array1, \@array2, ...);
for my $i (0..$#sets) {
for my $j ($i+1..$#sets) {
compute_stuff($sets[$i], $sets[$j]);
}
}
Your union/intersection code will now look like:
sub union_intersection {
my ($set1, $set2) = @_;
my (%union, %intersection)
for my $e (@$set1, @$set2) { ... }
...
}
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