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~8h total · Updated weekly · Last refresh Jul 24

Top 50 loops Interview Questions

The most frequently asked loops questions across all roles and companies, ranked by real interview frequency. Updated weekly.

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Sliding Window Rate Limiter

Medium

Use a hash map of queues to implement a per-client sliding-window rate limiter over timestamped API requests.

network requestsArraysloops

Recently asked

Palantir technologies

Reverse Array In Place

Easy

Reverse an array in place using a two-pointer approach without built-in reverse helpers.

RecursionArraysloops

Recently asked

NiCE

Reverse a Singly Linked List

Easy

Problem Given the head of a singly linked list, reverse the list and return the new head. Each node contains an integer value and a next pointer. The func...

RecursionLinked Listsloops

Recently asked

Accenture

Print Even Numbers in Array

Easy

Explain how to loop through an array and print only even numbers using a modulo check in Python.

even numbersArraysloops

Recently asked

BMW Group

First Unique Element Index

Easy

Use a hash table frequency count to return the index of the first unique element in an array.

Basic AlgorithmsloopsData Structures

NTT DATA

Rate-Limited Concurrent Web Scraper

Medium

Explain how to design a concurrent scraper that obeys rate limits using async requests, backoff, and adaptive scheduling.

network requestsloopsData Structures

Veeva Systems

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