A couple thoughts:

• You might have rectangles with the same area, so your hash should key on the coordinates, not the area. E.g. $NetAreaHash{$MinX,$MinY,$MaxX,$MaxY} = $Area (the commas in the hash key combine to make a unique key).

• For checking overlap, if any vertex of rectangle A is within rectangle B then they overlap. If no vertex of A is within B, B might still be entirely contained within A, so check one vertex of B to see if it's within A.

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