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Solution: Find Longest Self-Contained Substring

Explore how to identify the longest self-contained substring by using hash maps to track first and last character occurrences. Understand how to expand and validate substring windows while maintaining uniqueness constraints, all with linear time complexity and constant space usage.

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 ...