Solution: Longest Word With All Prefixes
Explore how to use the trie data structure to solve the problem of finding the longest word in an array whose every prefix is also present. Learn to build and traverse a trie to validate words efficiently, ensuring you can identify the longest and lexicographically smallest valid word by checking prefix completeness.
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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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