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Given directed pairs [u,v] as edges, order all pairs so each edge's end equals the next edge's start — this is equivalent to finding an Eulerian trail/path in the directed multigraph formed by the pairs (existence is guaranteed).
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Coding · Array · Backtracking · Bit Manipulation
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Leetcode 2097. Valid Arrangement of Pairs
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Source snapshot: Nov 12, 2026
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