Solution: Longest Word With All Prefixes
Understand how to use a trie data structure to find the longest word in a list such that every prefix of the word exists in the list. Explore trie construction, prefix validation, and lexical ordering to solve this common coding interview problem efficiently.
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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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