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Solution: Find Longest Self-Contained Substring

Explore how to find the longest self-contained substring within a string by using hash maps to track first and last character occurrences. Understand how to expand and validate substrings efficiently, applying this approach to solve algorithmic problems involving unique character constraints.

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 ...