Solution: Longest Word With All Prefixes
Explore how to use trie data structures to efficiently find the longest word whose every prefix is also present in a given list. Learn to implement the trie, validate prefixes, and select the longest lexicographically smallest valid word. Understand the time and space complexity involved.
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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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