Solution: Longest Word With All Prefixes
Explore how to use a trie data structure to find the longest word in an array such that every prefix is also in the list. Learn to build a trie, validate prefixes efficiently, and identify the longest valid word considering lexicographical ordering.
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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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