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Number of islands with DFS vs BFS vs Union-Find — trade-offs?

Q: Number of islands with DFS vs BFS vs Union-Find — trade-offs?

**Core concept.** Number of islands with DFS vs BFS vs Union-Find is a classic interview signal. Input n steps Optimal O(n log n) Result Verified How it works — use optimal structure, maintain invariants, handle empty/single/duplicate. Brute O(n²) vs optimal O(n) or O(n log n). | | Brute | Optimal | |---|---|---| | Time |

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Core concept. Number of islands with DFS vs BFS vs Union-Find is a classic interview signal.

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