Meta Software Engineer Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Solve delimiter and CSV tasks
The interview included two coding tasks: 1. Validate bracket sequences. Given a string consisting only of the characters (, ), [, ], {, and }, determi...
Implement fast power and k-palindrome
The phone screen included two coding tasks: 1. Fast exponentiation Given a floating-point number x and a signed integer n, compute x raised to th...
Implement an in-memory database with record locking
Implement an in-memory key–record database that supports basic CRUD on fields plus an exclusive lock per record. You are given a sequence of queries. ...
Implement array parity and tree level views
Implement the following coding tasks. 1. Check whether all values occur an even number of times - Input: an integer array nums. - Output: return...
Extend BFS maze solver with keys and arrows
Problem You are given a rectangular maze represented as a 2D grid of characters. Implement and iteratively fix/extend a solver that finds a shortest p...
Construct a BST and read spiral order
The coding round reportedly included two algorithmic tasks: 1. Rebuild a binary search tree from a preorder sequence - You are given an array of di...
Select words to maximize unique characters
Problem You are given an array of strings words. You may choose any subset of these strings and concatenate the chosen strings in any order. Your goal...
Solve array, tree, and maze problems
The onsite interview included the following algorithmic tasks: 1. Building visibility from the right: Given an integer array heights, where heights[i]...
Determine feasibility and clean parentheses string
You are given two independent coding tasks. 1) Check if all courses/tasks can be completed You have n courses labeled 0..n-1 and a list of prerequisit...
Solve maze reachability and two follow-ups
You are given three independent coding tasks. 1) Maze reachability with “rolling ball” movement Given an m x n grid maze where 0 means empty and 1 mea...
Implement an in-memory key-field-value DB with TTL
In-Memory DB with TTL + Scan + Backup/Restore Implement an in-memory database storing records by (key, field) -> value with optional TTL. Data model /...
Find top-K frequent elements in a stream
You receive a large stream of items (e.g., integers or strings) that may not fit in memory. Design an algorithm that can return the top K most frequen...
Check and infer custom alphabet
You are working with an unknown language that uses a custom alphabetical order, such as ['a', 'd', 'c', 'b', ...]. Implement the following: 1. Check s...
Implement BFS-based maze solver
Maze Printing and BFS Solver You are given a 2D grid representing a maze. Each cell of the grid is one of: - '#' – wall (cannot be passed) - '.' – emp...
Design an O(1) recency-evicting cache
Design and implement a fixed-capacity in-memory cache that supports get(key) and put(key, value) in average O( 1) time. When capacity is exceeded, evi...
Solve maze tasks and compute shortest routes
You are given two coding exercises from an interview loop. Problem A: Incremental “maze” codebase tasks (AI-assisted) You inherit an existing codebase...
Extend cloud file system with copy and compression
In-Memory Cloud File System V2: Copy, Capacity Updates, Compress/Decompress Design an in-memory file system with per-user quotas and additional operat...
Design a bank system with scheduled transfers
Bank System (OOD): Accounts, Transfers, Scheduling, Top Spending, Merge Design an in-memory banking system that supports: - account creation - deposit...
Implement a versioned in-memory DB with CAS and history
In-Memory DB V2: TTL + Compare-And-Set/Delete + Historical Reads Implement an in-memory database keyed by (key, field) supporting TTL, conditional upd...
Design an in-memory cloud file system
In-Memory Cloud File System (OOD) Design an in-memory cloud file system that supports files owned by users with storage quotas. Data model / rules - E...