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Grokking the Coding Interview Patterns in JavaScript

Solution: Find Longest Self-Contained Substring

Explore how to find the longest self-contained substring in a string by using hash maps to track first and last occurrences of characters. Learn to expand and validate windows to ensure substrings meet the unique character criteria while optimizing time and 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 ...