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Determine whether a set of 2D points is symmetric about some vertical line x = c — i.e., whether for every point its mirrored point across that line also appears in the set. This requires finding a candidate center line and efficiently verifying pairwise reflections (commonly via hashing or grouping) across all points.
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Coding · Array · Euclidean Algorithm · Geometry
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Leetcode 356. Line Reflection
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Source snapshot: Nov 12, 2026
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