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Leetcode 694. Number of Distinct Islands

Given a binary grid, count how many distinct island shapes (connected components of 1s via 4-directional adjacency) appear, treating two islands as identical if they match up to translation (but not rotation/reflection). The key challenge is to normalize each island's shape (e.g., by relative coordinates or a traversal signature) so you can deduplicate shapes efficiently.

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Oracle

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Mid November, 2025

Oracle

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