Quick Overview

Interleave three equal-length strings by taking the character at each index from the first, second, and third string in order. Preserve arbitrary Unicode characters, handle empty inputs, and build the result efficiently without quadratic repeated concatenation.

Interleave Three Equal-Length Strings

Company: Upstart

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: easy

Interview Round: Online Assessment

Overview: Interleave three equal-length strings by taking the character at each index from the first, second, and third string in order. Preserve arbitrary Unicode characters, handle empty inputs, and build the result efficiently without quadratic repeated concatenation.

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