Leetcode 1743. Restore the Array From Adjacent Pairs

Given unordered adjacent pairs from an array with unique elements, reconstruct the original array by treating values as nodes in a graph and the pairs as edges, then find an endpoint (degree 1) and traverse the path to recover the sequence. Constraints: n up to 1e5 and pairs are given in arbitrary order.

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Leetcode 1743. Restore the Array From Adjacent Pairs

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