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Interview questions by company and topic | SysRound

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7 questions

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CodingHardLeetCode 460
LFU Cache
Implement an LFU cache with O(1) average-time get and put operations that evicts the least-frequently-used key when capacity is exceeded, breaking ties by least-recently-used…
Companies: Amazon, Apple, Cisco, Goldman Sachs +3
Design · Doubly-Linked List · Hash Table · Linked List
Last reported Nov 2026
Open workspace
CodingMediumLeetCode 146
LRU Cache
Implement an LRUCache that supports O(1) average-time get(key) returning the value or -1 and put(key, value) which inserts or updates a key and, if capacity…
Companies: Adobe, Amazon, Anthropic, Apple +29
Data Structure Design · Design · Doubly-Linked List · Hash Table
Last reported Oct 2026
Open workspace
CodingHardLeetCode 432
All O`one Data Structure
Design a data structure that supports incrementing and decrementing string counts (removing keys when their count drops to zero) and can return any key with…

Companies: Atlassian, LinkedIn, Meta, Microsoft +2

Design · Doubly-Linked List · Hash Table · Linked List

Last reported Oct 2026

CodingHardLeetCode 716

Max Stack

Design a stack data structure that supports standard push, pop, and top operations, along with a getMax operation that retrieves (but does not remove) the…

Companies: Confluent, Everpure, LinkedIn, Walmart Labs

Design · Doubly-Linked List · Linked List · Ordered Set

Last reported Oct 2026

CodingMediumLeetCode 430

Flatten a Multilevel Doubly Linked List

Companies: Adobe, Amazon, Bloomberg, Microsoft

Depth-First Search · Doubly-Linked List · Linked List

Last reported Sep 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

CodingMediumLeetCode 1797

Design Authentication Manager

Manage tokens that expire timeToLive seconds after creation/renewal, supporting generate, renew (only if the token is still unexpired), and countUnexpiredTokens (with…

Companies: Adobe, OpenAI

Design · Doubly-Linked List · Hash Table · Linked List

Last reported Feb 2026