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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say postderef signatures state };
use List::Util qw{ uniq };
my @examples = (
[ 4, 4, 2, 4, 3 ],
[ 1, 1, 1, 1, 1 ],
[ 4, 7, 1, 10, 7, 4, 1, 1 ],
);
for my $e (@examples) {
my @ints = $e->@*;
my $ints = join ',', @ints;
my $output = unequal_triplets(@ints);
say <<~"END";
Input: \@ints = ($ints)
Output: ($output)
END
}
sub unequal_triplets (@ints) {
my $c = 0;
for my $i ( 0 .. -1 + scalar @ints ) {
for my $j ( $i + 1 .. -1 + scalar @ints ) {
for my $k ( $j + 1 .. -1 + scalar @ints ) {
next if $ints[$i] == $ints[$j];
next if $ints[$i] == $ints[$k];
next if $ints[$j] == $ints[$k];
$c++;
}
}
}
return $c;
}
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