Find the total area covered by two rectilinear rectangles in a 2D plane.
Each rectangle is defined by its bottom left corner and top right corner as shown in the figure.
在坐標中,求兩個長方形的總面積
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解題思路:分別求兩個長方形的面積,然后看兩個長方形是否相交,如果不相交,直接返回面積和;如果相交,求出相交面積。