850. Rectangle Area II

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You are given a 2D array of axis-aligned rectangles. Each rectangle[i] = [xi1, yi1, xi2, yi2] denotes the ith rectangle where (xi1, yi1) are the coordinates of the bottom-left corner, and (xi2, yi2) are the coordinates of the top-right corner. Calculate the total area covered by all rectangles in the plane. Any area covered by two or more rectangles should only be counted once. Return the total

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solution.cppC++17

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