269. Alien Dictionary

There is a new alien language that uses the English alphabet. However, the order among the letters is unknown to you.

You are given a list of strings words from the alien language's dictionary, where the strings in words are sorted lexicographically by the rules of this new language.

Return a string of the unique letters in the new alien language sorted in lexicographically increasing order by the

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Yaokun Lin @ MachineLearningQuickNotes

Yaokun Lin @ MachineLearningQuickNotes

Actuary | ML Practitioner | Apply Tomorrow's Technology to Solve Today's Problems

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