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leetcode-cn/problem (Chinese)/矩形面积 II [rectangle-area-ii].html
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<p>给你一个轴对齐的二维数组&nbsp;<code>rectangles</code>&nbsp;。 对于&nbsp;<code>rectangle[i] = [x1, y1, x2, y2]</code>，其中（x1，y1）是矩形&nbsp;<code>i</code>&nbsp;左下角的坐标，<meta charset="UTF-8" />&nbsp;<code>(x<sub>i1</sub>, y<sub>i1</sub>)</code>&nbsp;是该矩形 <strong>左下角</strong> 的坐标，<meta charset="UTF-8" />&nbsp;<code>(x<sub>i2</sub>, y<sub>i2</sub>)</code>&nbsp;是该矩形&nbsp;<strong>右上角</strong> 的坐标。</p>
<p>给你一个轴对齐的二维数组&nbsp;<code>rectangles</code>&nbsp;。 对于&nbsp;<code>rectangle[i] = [x1, y1, x2, y2]</code>，其中&nbsp;<code>(x<sub>i1</sub>, y<sub>i1</sub>)</code>&nbsp;是该矩形 <strong>左下角</strong> 的坐标，<meta charset="UTF-8" />&nbsp;<code>(x<sub>i2</sub>, y<sub>i2</sub>)</code>&nbsp;是该矩形&nbsp;<strong>右上角</strong> 的坐标。</p>
<p>计算平面中所有&nbsp;<code>rectangles</code>&nbsp;所覆盖的 <strong>总面积 </strong>。任何被两个或多个矩形覆盖的区域应只计算 <strong>一次</strong> 。</p>