Solution: Longest Word With All Prefixes
Discover how to implement a trie to solve the problem of finding the longest word with all its prefixes present in a given list. Learn to insert words, validate prefix completeness, and select the longest lexicographically smallest word, strengthening your problem-solving skills for coding interviews.
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Statement
You are given an array of strings, words. Your task is to find the longest string in words such that every prefix of this string is also present in words.
A prefix of a string is any leading substring. For example, the prefixes of "apple" are "a", "ap", "app", and "appl".
If multiple valid strings have the same maximum length, return the lexicographically smallest one.
If no such string exists, return an empty string
"".
Constraints:
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