hardDSA

Alien Dictionary: given sorted words in an alien language, how do you derive the character order?

Q: Alien Dictionary: given sorted words in an alien language, how do you derive the character order?

**Core concept.** Alien Dictionary: given sorted words in an alien language, how do you derive the character order? 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

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Core concept. Alien Dictionary: given sorted words in an alien language, how do you derive the character order? is a classic interview signal.

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