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Solution: Find Longest Self-Contained Substring

Explore how to identify the longest self-contained substring in a lowercase string by tracking character occurrences with hash maps. Understand window expansion and validation techniques to ensure all characters are unique to the substring. This lesson provides a step-by-step approach with efficient time and 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 ...