Solution: Longest Word With All Prefixes
Explore how to implement a trie to solve the problem of finding the longest word built one prefix at a time from a list. Understand trie node structure, insertion, and validation methods to identify valid words efficiently, and learn to return the lexicographically smallest longest 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:
words.length...