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 hard difficulty Coding & Algorithms question, commonly asked during Onsite rounds at Pinterest.

What role is this question designed for?

This question is commonly asked for Machine Learning Engineer candidates at Pinterest during technical interviews.

Support room moves and query top-k fastest

Last updated: Jun 27, 2026

Quick Overview

This question evaluates understanding of dynamic data structure design and ordering semantics, specifically maintaining per-room FIFO arrival order, constant-time room counts, and efficient top-k retrieval based on hierarchical priorities.