# 223. Rectangle area

[Leetcode](https://leetcode.com/problems/rectangle-area/)

Given the coordinates of two rectilinear rectangles in a 2D plane,
return the total area covered by the two rectangles.

The first rectangle is defined by its
bottom-left corner (ax1, ay1) and its
top-right corner (ax2, ay2).

The second rectangle is defined by its
bottom-left corner (bx1, by1) and its
top-right corner (bx2, by2).