Alien Dictionary Order

Coding

Derive the alien dictionary order from a sorted list of alien words.

Input: words = ["z","x","z"]

Output: "" (Empty String)

Explanation: The letter 'z' cannot come before 'x' and then suddenly after 'x', creating a cycle and making the dictionary invalid.

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Interview question asked to Software Engineers interviewing at GitLab, Kabbage, Bounce and other companies. Original question asked: Alien Dictionary Order.