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  1. or download this
    sub sortQ2
    {
    ...
        sortQ2($s, $m-1, $dst) if ($s < $m - 1);
        sortQ2($m+1, $e, $dst) if ($m + 1 < $e);
    }
    
  2. or download this
    use Data::Alias;
    
    ...
        ($s < $m - 1) && sortQ2($s, $m-1, $dst);
        ($m + 1 < $e) && sortQ2($m+1, $e, $dst);
    }