Quick Overview

Repeatedly remove equal adjacent character pairs until a Unicode string becomes stable. Use a stack-like single pass to expose newly adjacent duplicates, preserve pairwise run behavior such as three equal characters becoming one, and achieve linear time.

Remove All Adjacent Duplicate Pairs

Company: Whatnot

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: hard

Interview Round: Technical Screen

Overview: Repeatedly remove equal adjacent character pairs until a Unicode string becomes stable. Use a stack-like single pass to expose newly adjacent duplicates, preserve pairwise run behavior such as three equal characters becoming one, and achieve linear time.

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