Based on the line from point b to a point that what is in the set if it exceeds the Unvisited point b to point is less than the original value, it will fix up the mileage points.
Connected by a line from point b to point to any address in Unvisited set if the distance from point b to point less than the original value. It will change the distance to that point.
By looking at the weld line from point to point B that any address in Unvisited set if the distances from the point to the point นั้นน้อยกว่า B originals. It will modify the values distances at that point.