There are N, 1 <= N <= 1,000 rectangles in the 2-D xy-plane. The four sides of a rectangle are horizontal or vertical line segments. Rectangles are defined by their lower-left and upper-right corner points. Each corner point is a pair of two nonnegative integers in the range of 0 through 50,000 indicating its x and y coordinates.
There are N, 1 <= N <= 1,000 rectangles in the
阅读背景：
POJ 1389 Area of Simple Polygons（面积并）
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