Solution: Longest Word With All Prefixes
Explore how to implement a trie to find the longest word where every prefix is also a word in the list. Understand trie construction, prefix validation, and selecting the longest lexicographically smallest word. This lesson helps you master prefix tree usage for complex string problems in 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:
words.length...