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Interview questions by company and topic | SysRound

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4,878 questions

Showing 601–625

CodingMediumLeetCode 133
Clone Graph
Given a reference to a node in a connected undirected graph, produce a deep copy that recreates every node and its adjacency lists. Ensure cycles…
Companies: LinkedIn, Meta
Last reported Apr 2026
Open workspace
CodingMediumLeetCode 162
Find Peak Element
Find any index of a "peak" (an element strictly greater than its neighbors, with array ends treated as -∞) in an integer array where adjacent…
Companies: Adobe, Meta
Array · Binary Search
Last reported Apr 2026
Open workspace
CodingMediumLeetCode 1257
Smallest Common Region
Given lists where each entry names a parent region followed by its immediate subregions and two region names, find their smallest common region — the…

Page 25 of 196

Companies: Airbnb

Array · Binary Lifting · Breadth-First Search · Depth-First Search

Last reported Apr 2026

CodingDifficulty not specified

Bounding Box Overlap

Given a main axis-aligned bounding box (x1, y1, x2, y2) and a list of other axis-aligned bounding boxes, write a function that computes the total…

Companies: Qsc

Last reported Apr 2026

CodingHard

Implement Persistent KV Store Serialization

Companies: OpenAI

Database Internals · Key-Value Stores

Last reported Apr 2026

CodingMediumLeetCode 1438

Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Find the length of the longest contiguous subarray whose maximum minus minimum is ≤ limit; the key challenge is maintaining the window's current min and…

Companies: MongoDB, Uber

Array · Heap (Priority Queue) · Monotonic Queue · Ordered Set

Last reported Apr 2026

CodingDifficulty not specifiedLeetCode 680

Valid Palindrome II

Determine whether a string can become a palindrome by deleting at most one character: use a two-pointer scan from both ends and allow a single…

Companies: Meta, Microsoft

Last reported Apr 2026

CodingMedium

Implement a Least-Recently-Used Cache

Companies: Anthropic

Last reported Apr 2026

CodingHard

Compute Exclusive Time from Stack Events

Companies: Anthropic

Last reported Apr 2026

CodingHard

Group Duplicate Files by Content

Companies: Anthropic

Last reported Apr 2026

CodingMediumLeetCode 199

Binary Tree Right Side View

Return the values visible when viewing a binary tree from its right side — i.e., the rightmost node at each depth, ordered top to bottom…

Companies: Meta

Last reported Apr 2026

CodingHardLeetCode 2444

Count Subarrays With Fixed Bounds

Count the number of contiguous subarrays whose minimum equals minK and maximum equals maxK. The main challenge is to efficiently (O(n)) scan the array, partitioning…

Companies: Adobe, Uber

Array · Monotonic Queue · Queue · Sliding Window

Last reported Apr 2026

CodingDifficulty not specified

Design a Sliding-Window Event Stream Processor with Checksum Validation and Average Payload Length

Design an event processor for an unbounded stream where each event has an id, timestamp, payload string, and checksum, with events potentially arriving out of…

Companies: Box

Last reported Apr 2026

CodingMedium

Generate Function Profiling Events from Stack Samples

Companies: Anthropic

Simulation & State Machines · Stacks & Queues

Last reported Apr 2026

CodingMedium

Implement Social Graph Snapshot Queries

Companies: OpenAI

Data Structure Design · Graphs

Last reported Apr 2026

CodingDifficulty not specified

Leaky Bucket Rate Limiter

Implement a leaky bucket rate limiter with a fixed drain rate and finite capacity, supporting a `try_acquire(n)` method that returns whether a request is allowed…

Companies: Box

Last reported Apr 2026

CodingHardLeetCode 32

Longest Valid Parentheses

Find the length of the longest well-formed (balanced) parentheses substring in a string of '(' and ')', handling nested and adjacent valid segments; this typically…

Companies: Amazon, Meta, Microsoft, Uber

Bracket Sequences · Dynamic Programming · Stack · String

Last reported Apr 2026

CodingMediumLeetCode 323

Number of Connected Components in an Undirected Graph

Given n labeled nodes and a list of undirected edges, determine how many connected components the graph contains. This requires grouping nodes reachable from each…

Companies: Amazon, Uber

Last reported Apr 2026

CodingMediumLeetCode 50

Pow(x, n)

Compute x raised to the integer power n (n may be negative and within 32-bit bounds), returning a double. The challenge is to handle negative…

Companies: Meta

Last reported Apr 2026

CodingMedium

Build a File-Backed Key-Value Store

Companies: OpenAI

File & Media Storage · Key-Value Stores

Last reported Apr 2026

CodingDifficulty not specifiedLeetCode 1135

Connecting Cities With Minimum Cost

Given n cities and a list of undirected weighted connections, find the minimum total cost to connect all cities (or return -1 if it's impossible)…

Companies: LinkedIn, Meta

Last reported Apr 2026

CodingEasy

Implement Chat Event Counter

Companies: OpenAI

Last reported Apr 2026

CodingDifficulty not specifiedLeetCode 449

Serialize and Deserialize BST

Design algorithms to serialize a binary search tree into a compact string and deserialize it back to the exact original tree. Leverage the BST ordering…

Companies: LinkedIn, Microsoft

Last reported Apr 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

CodingDifficulty not specifiedLeetCode 1287

Element Appearing More Than 25% In Sorted Array

Given a non-decreasing integer array that contains exactly one value occurring in more than 25% of elements, return that value. The sorted order lets you…

Companies: Meta

Last reported Apr 2026