The solution to each forest is a curve with the 'start' and the 'end' point. We minimize the length of the curve for that forest. Constraint: if the starting

The solution to each forest is a curve with the 'start' and the 'end' point. We minimize the length of the curve for that forest. Constraint: if the starting point of the curve is placed anywhere in that specific forest then some point of it must be outside regardless of the orientation of the curve. That's for avoiding thinking about the function of itself.