private static float Swap2OptDistance(List <ExploreCell> tour, CellsDistancer distances, int i, int k)
{
var tour_indices = tour.Select(x => x.GlobalId).ToList();
tour_indices.Reverse(i, k - i + 1);
float travel_distance = 0;
if (tour_indices.Count > 2)
{
for (int n = 0; n < tour_indices.Count - 1; ++n)
{
travel_distance += distances.GetDistance(tour_indices[n], tour_indices[n + 1]);
}
}
return(travel_distance);
}