Leetcode 3009. Maximum Number of Intersections on the Chart

Given multiple series plotted over the same x-coordinates, compute the maximum number of pairwise intersections among the piecewise-linear lines formed by connecting points across x — essentially counting line crossings between adjacent x-columns. This requires efficiently counting inversions/crossings (sweep-line, BIT/segment-tree or order-statistic structure) to handle large inputs.

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Mid November, 2025

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