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Longest Happy Prefix

Explore how to find the longest happy prefix of a string, a crucial substring pattern where the prefix also appears at the end. This lesson helps you understand and implement hash map techniques to efficiently solve this challenge, building skills to handle similar string problems in coding interviews.

Statement

Given a string, s, find the longest happy prefix. If no such prefix exists, return an empty string "".

Note: A happy prefix of a string is a non-empty substring at the beginning that also appears at the end (but not the entire string itself).

Constraints:

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