The basic thought of this method is that it can be assured that the start meeting point is at the beginning point and the end meeting point is at the end point of this searching road through enlarging or decreasing to be as integer.

• 该法的基本思想是：通过增大或者减小取整的方法来保证起始相遇点在起始点，终止相遇点在该搜索段的终止点。