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Determine whether all non-overlapping rectangles can be separated into three non-empty contiguous vertical or horizontal strips by placing two parallel cut lines so that no rectangle crosses a cut — equivalently, check if the rectangles' x- (or y-) projection intervals can be sorted and split into three contiguous groups by two cut positions.
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Leetcode 3394. Check if Grid can be Cut into Sections
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Source snapshot: Nov 12, 2026
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