my $numArrays = keys %ids;
my %count = ();
my @intersection = ();
foreach my $k (keys %ids) {
    my %uniq = map { $_ => 1 } @{ $ids{$k} };
    $count[$_]++ for keys %uniq;
}
foreach my $v (keys %count) {
    push @intersection, $v if $count[$v] == $numArrays;
}

[download]
Some one can golf that I'm sure.. That's a real quick first pass.. Do you understand what its doing? If not, I can explain! :)

You might also want to check out the CPAN for cool modules like Quantum::Superpositions or just seek and you might find.

Update: Fixed solution such that multiple occurences in a single array won't skew the results per Solo's post.

-brad..

In reply to Re: intersection of N arrays by reyjrar
in thread intersection of N arrays by basscakes

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