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Grokking the Coding Interview Patterns in Python

Solution: Find Longest Self-Contained Substring

Explore how to find the longest self-contained substring in a given string by using hash maps to track character occurrences. Understand how to adjust substring windows dynamically and validate uniqueness to solve substring problems efficiently with linear time complexity.

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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 ...