Quick Overview

Find the longest contiguous substring containing at most two distinct characters. This portable version of the standard referenced problem defines empty input, an ASCII character domain, exact return semantics, and two examples for later cross-language console verification.

Find the Longest Substring with at Most Two Distinct Characters

Company: TikTok

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

Overview: Find the longest contiguous substring containing at most two distinct characters. This portable version of the standard referenced problem defines empty input, an ASCII character domain, exact return semantics, and two examples for later cross-language console verification.

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