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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say postderef signatures state };
use List::Util qw{ sum0 };
my @examples = (
[ 1, 2, 3, 45 ],
[ 1, 12, 3 ],
[ 1, 2, 3, 4 ],
[ 236, 416, 336, 350 ],
);
for my $example (@examples) {
my @ints = $example->@*;
my $ints = join ',', @ints;
my $output = element_digit_sum(@ints);
say <<"END";
Input: \@ints = ($ints)
Output: $output
END
}
sub element_digit_sum (@ints) {
my @digits = map { split //, $_ } @ints;
my $element_sum = sum0 @ints;
my $digit_sum = sum0 @digits;
return abs $element_sum - $digit_sum;
}
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