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Interview questions by company and topic | SysRound

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4,878 questions

Showing 676–700

CodingMediumLeetCode 122
Best Time to Buy and Sell Stock II
Given daily stock prices, compute the maximum profit you can achieve with unlimited buy/sell operations while holding at most one share at a time (you…
Companies: Apple, Bloomberg, Meta, Oracle
Array · Dynamic Programming · Greedy
Last reported Mar 2026
Open workspace
CodingHardLeetCode 273
Integer to English Words
Convert a non-negative integer to its English words representation. The core challenge is chunking the number into three-digit groups (ones, thousands, millions, billions)…
Companies: Amazon, Microsoft
Math · Recursion · String
Last reported Mar 2026
Open workspace
CodingMediumLeetCode 518
Coin Change II

Page 28 of 196

Given unlimited coins of specified denominations, count how many distinct combinations (order irrelevant) sum to a target amount. This is a classic unbounded knapsack /…

Companies: Pinterest

Last reported Mar 2026

CodingEasy

Design a Versioned Social Follow Graph with Friend Recommendations

Companies: OpenAI

Last reported Mar 2026

CodingDifficulty not specified

Implement Tetris Game Logic

Design and implement the core game logic for a Tetris game, including piece movement, rotation, line clearing, and collision detection. Focus on the data structures…

Companies: Microsoft

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 1825

Finding MK Average

Maintain a sliding window of the last m stream elements and, after discarding the smallest k and largest k values, return the integer average of…

Companies: Google, Meta

Last reported Mar 2026

CodingDifficulty not specified

Generate Uniformly Random Acyclic Maze

Given an n×m grid with a starting point and exit point, generate a uniformly random acyclic maze where all paths are equally likely to be…

Companies: Uber

Last reported Mar 2026

CodingHardLeetCode 10

Regular Expression Matching

Determine whether a pattern p (with '.' matching any single character and '*' meaning zero or more of the preceding element) matches the entire string…

Companies: Amazon, Microsoft

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 804

Unique Morse Code Words

Convert each word into its Morse-code string by concatenating the fixed per-letter encodings, and return how many distinct transformations appear across the list — a…

Companies: Oscar Health

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 2655

Find Maximal Uncovered Ranges

Given a set of possibly overlapping, unsorted intervals within a domain (e.g., [lower, upper]), compute the maximal uncovered ranges—the complement segments not covered by any…

Companies: Google

Last reported Mar 2026

CodingMedium

Implement a crash-resilient LRU cache

Companies: Anthropic

Caching · Data Structure Design · Database Internals · System Design

Last reported Mar 2026

CodingMediumLeetCode 64

Minimum Path Sum

Given an m×n grid of non-negative numbers, find the minimum-sum path from the top-left to bottom-right when you may only move right or down. This…

Companies: Goldman Sachs, Oracle

Array · Dynamic Programming · Matrix

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 112

Path Sum

Determine whether a binary tree contains a root-to-leaf path whose node values add up to a given targetSum. (A leaf is a node with no…

Companies: Amazon, Meta, Oracle

Last reported Mar 2026

CodingMediumLeetCode 567

Permutation in String

Check whether any substring of s2 of length |s1| is a permutation of s1 (i.e., has the same character multiset). The core challenge is to…

Companies: Apple, Meta

Hash Table · Sliding Window · String · Two Pointers

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 2126

Destroying Asteroids

Given a starting mass and asteroid masses, determine whether you can order collisions so the planet can sequentially absorb every asteroid (absorbing requires current mass…

Companies: Meta

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 806

Number of Lines To Write String

Given an array widths mapping each lowercase letter to its pixel width and a string s, pack characters sequentially into lines with a maximum width…

Companies: Google

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 109

Convert Sorted List to Binary Search Tree

Companies: Meta

Last reported Mar 2026

CodingMedium

Design an Editable Text Buffer

Companies: OpenAI

Data Structure Design · Stacks & Queues

Last reported Mar 2026

CodingDifficulty not specified

Merge Log Streams and Verify Completeness

Given multiple log streams, merge them into a final log and verify that all entries from the original streams are present in the merged result…

Companies: Microsoft

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 1836

Remove Duplicates From an Unsorted Linked List

Companies: Oracle, Salesforce

Last reported Mar 2026

CodingMediumLeetCode 62

Unique Paths

Count the number of distinct monotonic paths from the top-left to the bottom-right of an m×n grid when you may only move right or down…

Companies: Amazon, Meta, Microsoft, Oracle

Last reported Mar 2026

CodingMediumLeetCode 863

All Nodes Distance K in Binary Tree

Given a binary tree and a target node value, return all node values at distance K from the target. The challenge is to traverse both…

Companies: Amazon, Meta, Microsoft, TikTok

Binary Tree · Breadth-First Search · Depth-First Search · Hash Table

Last reported Mar 2026

CodingMedium

Find Minimum Compatible Version

Companies: OpenAI

Binary Search

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 2737

Find the Closest Marked Node

Given an undirected tree (or graph) where nodes can be toggled "marked," support operations that mark/unmark nodes and queries that ask for the shortest distance…

Companies: DoorDash

Last reported Mar 2026

CodingDifficulty not specifiedLeetCode 2933

High-Access Employees

Given timestamped accesses per employee, find all employees who made three or more accesses within any one-hour period (accesses exactly 60 minutes apart do not…

Companies: PayPal

Last reported Mar 2026