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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ bitwise fc postderef say signatures state };
use List::Util qw{max};
my @examples = (
[ 12, 12, 30, 24, 24 ],
[ 72, 48, 24, 5 ],
[ 12, 18, 24 ],
);
for my $example (@examples) {
my $output = complete_day($example);
my $input = join ', ', $example->@*;
say <<~"END";
Input: \@hours = ($input)
Output: $output
END
}
sub complete_day ($durations) {
my @output;
my @durations = $durations->@*;
for my $i ( 0 .. -1 + scalar @durations ) {
for my $j ( $i + 1 .. -1 + scalar @durations ) {
my $d = $durations[$i] + $durations[$j];
push @output, [ $durations[$i], $durations[$j] ] if $d % 24 == 0;
}
}
return scalar @output;
}
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