Alien Dictionary
Explore how to solve the Alien Dictionary problem by using topological sorting to determine the order of unique letters in an alien language. Learn to analyze word lists, handle multiple valid orderings, and implement your solution in JavaScript to prepare for coding interviews.
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Statement
You are given a list of words written in an alien language, where the words are sorted lexicographically by the rules of this language. Surprisingly, the aliens also use English lowercase letters, but possibly in a different order.
Given a list of words written in the alien language, return a string of unique letters sorted in the lexicographical order of the alien language as derived from the list of words.
If there’s no solution, that is, no valid lexicographical ordering, you can return an empty string "".
If multiple valid orderings exist, you may return any of them. ...