public double DistanceTo(City other)
{
var dx = other.LocationX - LocationX;
var dy = other.LocationY - LocationY;
return Math.Sqrt(dx * dx + dy * dy);
}
public Tour Swap(int indexOfCity1, int indexOfCity2)
{
var copy = new City[_route.Length];
_route.CopyTo(copy, 0);
var s = copy[indexOfCity1];
copy[indexOfCity1] = copy[indexOfCity2];
copy[indexOfCity2] = s;
return new Tour(copy);
}