Solution: Longest Word With All Prefixes
Explore how to use a trie data structure to identify the longest word in a list where every prefix is also a word. Learn to build and traverse a trie, validate words efficiently, and handle lexicographical order when multiple candidates share length.
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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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