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Grokking the Coding Interview Patterns in Go

Solution: Find Longest Self-Contained Substring

Explore how to find the longest self-contained substring in a string by using hash maps to track character occurrences and expanding windows to validate unique substrings. Understand key steps and optimizations to implement an efficient O(n) time solution with constant space 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 ...