How do I practice coding and algorithm questions?

Use PracHub's coding console to write, test, and debug your solutions in Python or JavaScript. View hints, test against sample inputs, and compare with official solutions.

What difficulty level is this coding question?

This is a hard difficulty Coding & Algorithms question, commonly asked during Onsite rounds at OpenAI.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at OpenAI during technical interviews.

Aggregate Recent Message Events And Active Chats

Quick Overview

Prepare for a stateful event aggregation coding prompt over chat events and active chats in a rolling five-minute window. The question is useful for discussing bounded memory, window eviction, per-user active state, and how requirements change when events arrive out of order.

Quick Overview

hard
OpenAI
Coding & Algorithms
Software Engineer

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