sub nn { my @x = @_[0, 1]; @_ = sort { abs $x[0] - $x[1] < abs $a - $b or @x = ($a, $b); $a <=> $b; } @_; @x } sub nn { () = sort { abs $_[0] - $_[1] < abs $a - $b or @_ = ($a, $b); $a <=> $b; } @_; @_ }