Leetcode 850. Rectangle Area II
Compute the union area of up to 200 axis-aligned rectangles with coordinates up to 1e9, counting overlapping regions only once and returning the result modulo 1e9+7. This is typically solved with an x-axis sweep line that accumulates area using the total covered y-length at each x-interval (maintained via interval merging or a segment tree after coordinate compression).
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Late October, 2024
Mid-level
Calculate the total area covered by the union of multiple rectangles
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