sub test {
    my ($array1ref, $array2ref) = @_;

    my $count = 0;
    for my $idx (0 .. $#$array1ref) {
        my $element  = $array1ref->[$idx];
        my $element2 = $array2ref->[$idx];
        if ($element eq $element2) {
            warn "$element $element2 same";
            $count++;
        } else {
            warn "$element $element2 different";
        }
    }
    return $count
}