Quick Overview

Group encoded event rows by a caller-specified ordered list of attributes and return the nested counts as canonical compact JSON. This challenge tests dynamic map depth, field-position resolution, deterministic key sorting, repeated combinations, portable serialization, empty input, and output-aware complexity.

Group Events by an Ordered Attribute List

Company: Mixpanel

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

Overview: Group encoded event rows by a caller-specified ordered list of attributes and return the nested counts as canonical compact JSON. This challenge tests dynamic map depth, field-position resolution, deterministic key sorting, repeated combinations, portable serialization, empty input, and output-aware complexity.

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