Introduction
A very interesting problem, indeed. I presume, not a complex one either. Here is what the problem statement looks like. "Given a set of N points in a plane, find the closest pair points". A question which is always asked in interviews in various forms, here we will not just look at the solution but will also understand the intuition behind the solution.
In the adjoining image, we have five points (A, B, C, D, E) in the plane. As a result of the solution we need to return one pair which has the smallest distance between them. Of course there can be multiple such pairs, we a...

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