How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a Medium difficulty Coding & Algorithms question, commonly asked during Technical Screen rounds at Akuna Capital.

What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Akuna Capital during technical interviews.

Compute statistics in data stream

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of streaming data structures and statistical aggregation, specifically maintaining max, mean, and mode for an unbounded integer stream.

Medium
Akuna Capital
Coding & Algorithms
Data Scientist

Akuna Capital

Aug 4, 2025, 10:55 AM

Data Scientist

Technical Screen

Coding & Algorithms

Question

Design a data structure that supports computing the current max, mean, and mode for an unbounded integer data stream. Estimate the memory usage of your design; assume the integers lie in the range 1–1001. Modify the design to return the max, mean, and mode for only the most recent k elements using a sliding-window approach.

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