Find the Number of Ways to Place People I

Description

You are given a 2D array points of size n x 2 representing integer coordinates of some points on a 2D plane, where points[i] = [xi, yi].

Count the number of pairs of points (A, B), where

- A is on the upper left side of B, and

- there are no other points in the rectangle (or line) they make (including the border), except for the points A and B.

Return the count.