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Interview questions by company and topic | SysRound

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4,878 questions

Showing 751–775

CodingDifficulty not specified
Thread-Safe Message Queue Implementation
Implement a thread-safe message queue that supports one producer and multiple consumers. The solution should correctly handle concurrent access and synchronization between the…
Companies: NVIDIA
Last reported Feb 2026
Open workspace
CodingDifficulty not specified
Count Special Palindromic Substrings
Given a string, count the number of special palindromic substrings where a special palindrome is defined as either having all identical characters or having all…
Companies: 6sense
Last reported Feb 2026
Open workspace
CodingHard
Implement a Contiguous Memory Allocator with Primitive Lists
Companies: OpenAI

Page 31 of 196

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 123

Best Time to Buy and Sell Stock III

Given daily stock prices, find the maximum profit achievable with at most two non-overlapping buy-sell transactions (you must sell before buying again). Expect to exploit…

Companies: Meta, Oracle

Last reported Feb 2026

CodingMedium

Design plant-infection algorithms

Companies: OpenAI

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 1239

Maximum Length of a Concatenated String with Unique Characters

Given an array of lowercase strings, choose a subsequence (order preserved) whose concatenation contains only unique characters and return the maximum possible length of that…

Companies: Meta

Last reported Feb 2026

CodingDifficulty not specified

Multi-Source BFS with Obstacles and Variable Weights

Given a grid with trucks, obstacles, and boundary dispatch points, find the minimum time to dispatch all trucks using BFS propagation. Follow-up involves weighted propagation…

Companies: Amazon

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 3686

Number of Stable Subsequences

Count the number of subsequences of nums that do not contain three consecutive elements of the same parity, returning the result modulo 1e9+7. With n…

Companies: Meta

Last reported Feb 2026

CodingMedium

Compute Plant Infection Stabilization

Companies: OpenAI

Grids & Matrices · Simulation & State Machines

Last reported Feb 2026

CodingDifficulty not specified

Evaluate and Simplify Mathematical Expressions

Design an algorithm to parse, evaluate, and simplify mathematical expressions. The expressions may contain arithmetic operators (+, -, *, /), variables, and parentheses. Handle…

Companies: Google, HubSpot, Meta

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 1832

Check if the Sentence Is Pangram

Check whether a lowercase string is a pangram by verifying it contains all 26 English letters at least once. This can be done in O(n)…

Companies: Goldman Sachs

Last reported Feb 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

CodingMediumLeetCode 874

Walking Robot Simulation

Simulate a robot on an infinite grid executing turn commands and unit-step moves, stopping any step that would hit an obstacle and updating its facing…

Companies: Apple, Meta, Shopify

Array · Hash Table · Simulation

Last reported Feb 2026

CodingMediumLeetCode 152

Maximum Product Subarray

Find the contiguous subarray with the largest product in an integer array; because negatives and zeros can flip signs, you must track both the running…

Companies: LinkedIn, Microsoft

Array · Dynamic Programming

Last reported Feb 2026

CodingEasy

Simulate a Turn-Based Two-Player Game

Companies: OpenAI

Low-Level Design (OOP) · Simulation & State Machines

Last reported Feb 2026

CodingEasyLeetCode 1614

Maximum Nesting Depth of the Parentheses

Given a valid parentheses string, compute its maximum nesting depth — the largest number of parentheses that are open at the same time. (Equivalent to…

Companies: Meta, Rippling

Bracket Sequences · Stack · String

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 65

Valid Number

Determine whether a given string matches the grammar of a numeric literal: an optional sign, then either an integer or a decimal (allowing formats like…

Companies: LinkedIn, Meta

Last reported Feb 2026

CodingMedium

Implement a web crawler using a provided API

Companies: Anthropic

Graphs

Last reported Feb 2026

CodingMedium

Implement an in-memory DB with TTL backup/restore

Companies: Anthropic

Data Structure Design

Last reported Feb 2026

CodingHard

Implement type AST and infer generics

Companies: OpenAI

Parsing & Interpreters

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 1749

Maximum Absolute Sum of Any Subarray

Find the maximum absolute sum of any contiguous subarray (possibly empty) in an integer array — i.e., the maximum of the largest subarray sum and…

Companies: Upstart

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 1375

Number of Times Binary String Is Prefix-Aligned

Given a permutation flips describing the order in which bits in an all-zero length-n binary string are turned to 1, count how many steps i…

Companies: Salesforce

Last reported Feb 2026

CodingDifficulty not specifiedLeetCode 83

Remove Duplicates from Sorted List

Companies: Salesforce

Last reported Feb 2026

CodingDifficulty not specified

Minimum Water Tanks for Houses

Given a string representing houses ('H') and empty spaces ('-'), determine the minimum number of water tanks needed such that each house has a tank…

Companies: Geico

Last reported Feb 2026

CodingDifficulty not specified

Find Balanced Numbers in a Permutation

Given a permutation P of length N, determine for each k (1 ≤ k ≤ N) if k is balanced, where k is balanced if…

Companies: Uber

Last reported Feb 2026