G'day BrowserUk,
Using your 5 subarrays, I selected the middle one ([ 0, 10, 11, 19 ]): that should find the first and last subarrays as being the only ones not containing any of the integers: 0, 10, 11, 19.
I don't believe this should consume huge amounts of memory:
#!/usr/bin/env perl -l
use strict;
use warnings;
my @AoA = (
[ 2, 13, 3, 16 ],
[ 10, 1, 11, 6 ],
[ 0, 10, 11, 19 ],
[ 6, 1, 19, 15 ],
[ 17, 6, 18, 12 ],
);
my $selected = $AoA[2];
my %unique = map { $_ => 1 } @$selected;
print "@$_" for grep { ! map { $_ ? $_ : () } @unique{@$_} } @AoA;
Output:
2 13 3 16
17 6 18 12
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