Building off my solution to an earlier problem: Re: Sub array in Array of array

use strict;
use warnings;

my %input = (
    r => [1..10],
    s => [1..10],
    t => [5..10],
    u => [11..20],
);

for my $outer (sort keys %input) {
    next if ! $input{$outer};
    my %seen = map {$_ => 1} @{$input{$outer}};
    for my $inner (grep {$_ ne $outer} sort keys %input) {
        if (! grep {!$seen{$_}} @{$input{$inner}}) {
            delete $input{$inner};
        }
    }
}

print "$_\n" for sort keys %input;

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In reply to Re: Remove the duplication in Hash values by wind
in thread Remove the duplication in Hash values by Kandankarunai

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