Quick Overview

Return the leftmost longest contiguous substring whose characters are all unique. Handle empty input, ASCII and case-sensitive semantics, large strings, actual-substring output, streaming constraints, and the distinction among bytes, characters, and graphemes.

Longest Substring Without Repeated Characters

Company: Cisco

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: easy

Interview Round: Technical Screen

Overview: Return the leftmost longest contiguous substring whose characters are all unique. Handle empty input, ASCII and case-sensitive semantics, large strings, actual-substring output, streaming constraints, and the distinction among bytes, characters, and graphemes.

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