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Solution: Find Longest Self-Contained Substring

Explore how to identify the longest self-contained substring in a string by using hash maps to track character positions and expanding a sliding window to ensure substring validity. Learn an efficient O(n) algorithm that applies hash map logic to solve this specific string problem, essential for coding interviews focused on string manipulation and hash map patterns.

Statement

You are given a string, s, consisting of lowercase English letters. Your task is to find the length of the longest self-contained substring of s.

A substring t of s is called self-contained if:

  • t is not equal to the entire string s.

  • Every character in t does not appear anywhere else in s ...