Find the Longest Substring Without Repeated Characters

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Quick Overview

Implement the length of the longest contiguous substring whose ASCII characters are all distinct. Focus on contiguous-range reasoning, repeated-character boundaries, empty inputs, case sensitivity, and linear-time scalability for long strings.

Find the Longest Substring Without Repeated Characters

Company: Netflix

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

Overview: Implement the length of the longest contiguous substring whose ASCII characters are all distinct. Focus on contiguous-range reasoning, repeated-character boundaries, empty inputs, case sensitivity, and linear-time scalability for long strings.

Read the full Netflix Software Engineer interview experience this question came from

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Netflix
Jul 31, 2026
mediumSoftware EngineerTechnical ScreenCoding & Algorithms
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