Algorithm 2 PN_VC Search Algorithm

$x$ = $x_0$

Random select a VC in EBP_VC

Check out PN_VC of this VC

Allocate PN_VC to $s_j$ and update $x$

Connectivity constraint check and assurance algorithm, $x$ → $x_1$

Compactness constraint assurance, $x_1$ → $x_2$

If $F\left(x_2\right)$ < $F\left(x_0\right)$

$x_0$ = $x_2$

else

$x_0$ = $x_0$