Solution: Longest Word With All Prefixes
Explore how to solve the longest word with all prefixes problem by building and traversing a trie. Understand how to verify all prefixes exist in the word list and select the longest lexicographically smallest valid word.
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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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