Playing with grids

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The engineers at Google love to come up with different games which stretch the mind and make you think hard. The other day while playing chess, one of the engineers challenged his opponent to tell him the number of rectangles that are contained in the chessboard. Being Google, the chessboards they have here are not necessarily of the standard 8x8 size. Rather they can be of any arbitrary size M x

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solution.cppC++17

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