How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a Medium difficulty Coding & Algorithms question, commonly asked during Technical Screen rounds at Amazon.

What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Amazon during technical interviews.

Determine Length of Longest Unique Substring | Amazon Interview Question

Determine Length of Longest Unique Substring

Last updated: Mar 29, 2026

Quick Overview

This question evaluates string-processing skills and algorithmic problem-solving, including handling character uniqueness and performance considerations. Commonly asked in Coding & Algorithms interviews to assess a candidate's ability to implement efficient solutions and reason about time/space trade-offs, it targets practical application rather than purely conceptual understanding.

Amazon

Aug 4, 2025, 10:55 AM

Data Scientist

Technical Screen

Coding & Algorithms

Scenario

Online assessment: coding portion that follows the SQL questions.

Question

Implement a function that, given a string s, returns the length of the longest substring without repeating characters.

Hints

Use a sliding window and a hash map to track the latest index of each character.

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