4. The algorithm:Input: A set S of n planar points.Output: The distance between two closest points. Step 1: Sort points in S according to their y-values.Step 2: If S contains only one point, return infinity as its distance.Step 3: Find a median line L perpen
5. Step 5: For a point P in the half-slab bounded by L-d and L, let its y-value be denoted as yP . For each such P, find all points in the half-slab bounded by L and L+d whose y-value fall within yP+d and yP-d. If the distance d between P and a point in t