Grand temple question

i didn’t understood the question can you please explain it to me in detail

Imagine a city made up of cells. You are given the coordinates of some points. Now if you have been given a point ( a, b) then a river flows in vertical manner at x = a and a river flows in horizontal manner at y = b. Consider the same for all the points. Now the entire city is divided into rectangles of different areas. Here a rectangle consists of cells who either have a river or a city border on each of the 4 sides and no river flows within it. You need to find the largest area.

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