private int SquaredDistanceToNearestNeighbour(int[] point)
{
IntMath fy = new IntMath();
var nodeNearestNeighbours = tree.GetNearestNeighbours(point, tree.Count());
var nodeNearestNeighbour = nodeNearestNeighbours.First(x => x.Point != point);
var nodeNearestNeighbourPoint = nodeNearestNeighbour.Point;
return(fy.DistanceSquaredBetweenPoints(nodeNearestNeighbourPoint, point));
}