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Solution: Find Longest Self-Contained Substring

Explore how to find the longest self-contained substring within a given string using hash maps. This lesson teaches you to track character occurrences, expand valid windows, and verify substring uniqueness efficiently. You will understand how to implement this in O(n) time and constant space, improving your problem-solving skills for coding interviews.

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 ...