Implement A Contiguous Memory Allocator With Free-Block Coalescing

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Quick Overview

Review a contiguous memory allocator coding prompt with malloc, free, first-fit allocation, block coalescing, and a best-fit follow-up. The interview topic emphasizes interval management, allocated-block maps, fragmentation, secondary indexes, and complexity trade-offs.

Implement A Contiguous Memory Allocator With Free-Block Coalescing

Company: OpenAI

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

Overview: Review a contiguous memory allocator coding prompt with malloc, free, first-fit allocation, block coalescing, and a best-fit follow-up. The interview topic emphasizes interval management, allocated-block maps, fragmentation, secondary indexes, and complexity trade-offs.

Read the full OpenAI Software Engineer interview experience this question came from

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OpenAI
Jun 5, 2026
mediumSoftware EngineerTechnical ScreenCoding & Algorithms
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