Quick Overview

Multiply two sparse integer matrices without performing work for known zero contributions. Preprocess nonzero rows, join compatible inner indices, accumulate in a wide numeric type, and return the required dense result without mutating either input.

Multiply Two Sparse Matrices

Company: Apple

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

Overview: Multiply two sparse integer matrices without performing work for known zero contributions. Preprocess nonzero rows, join compatible inner indices, accumulate in a wide numeric type, and return the required dense result without mutating either input.

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