Implement Python Function for Longest Unique Substring Length
Company: Amazon
Role: Data Scientist
Category: Coding & Algorithms
Difficulty: Medium
Interview Round: Onsite
##### Scenario
Real-time text analytics service enforcing uniqueness constraints
##### Question
Implement a Python function returning the length of the longest substring without repeating characters. Follow-up: modify it to return all substrings that meet this criterion.
##### Hints
Sliding window with hash map for indices; for follow-up, track start positions and collect substrings of max length.
Quick Answer: This question evaluates string manipulation and algorithmic problem-solving skills by requiring a Python implementation to determine the length of the longest substring without repeating characters, with an optional follow-up to extract all maximal substrings.
