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8 questions

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CodingMediumLeetCode 362
Design Hit Counter
Design a hit counter that records timestamps of hits and returns the number of hits in the past 5 minutes (300 seconds). The challenge is…
Companies: Adyen, Apple, Cisco, Databricks +5
Array · Binary Search · Data Stream · Design
Last reported Nov 2026
Open workspace
CodingEasyLeetCode 359
Logger Rate Limiter
Implement a logger that decides whether to print a message at a given timestamp: return true if the message hasn't been printed in the last…
Companies: Amazon, Bloomberg, Google, Microsoft +3
Data Stream · Design · Hash Table
Last reported Sep 2026
Open workspace
CodingHardLeetCode 295
Find Median from Data Stream
Maintain a data structure that supports adding integers from a stream and returning the current median efficiently for many interleaved addNum and findMedian calls. The…

Companies: Adobe, Amazon, D. E. Shaw, Intuit +4

Data Stream · Design · Heap (Priority Queue) · Sorting

Last reported Aug 2026

CodingMediumLeetCode 1429

First Unique Number

Design a data structure that, given an initial list and a stream of added numbers, returns the first integer that appears exactly once at any…

Companies: Uber

Array · Data Stream · Design · Hash Table

Last reported Jun 2026

CodingHardLeetCode 642

Design Search Autocomplete System

Design an online autocomplete system that processes characters one-by-one, returning the top 3 historically most frequent sentences that match the current prefix (ranked by…

Companies: Google, Netflix, Pinterest, Vercel

Data Stream · Depth-First Search · Design · Heap (Priority Queue)

Last reported May 2026

CodingMediumLeetCode 1472

Design Browser History

Implement a BrowserHistory class that supports visiting URLs (which clears any forward history), moving back or forward up to a specified number of steps, and…

Companies: Amazon, Bloomberg, Chime

Array · Data Stream · Design · Doubly-Linked List

Last reported Apr 2026

CodingEasyLeetCode 346

Moving Average from Data Stream

Design a data structure that, given a continuous stream of numbers and a fixed window size k, returns the moving average of the last k…

Companies: Box, Google, Meta, Spotify

Array · Data Stream · Design · Queue

Last reported Mar 2026

CodingMediumLeetCode 3829

Design Ride Sharing System

Companies: Rippling

Data Stream · Design · Hash Table · Queue