Meta Coding & Algorithms Interview Questions

Preparing for Meta Coding & Algorithms interview questions requires focusing on algorithmic problem solving, writing production-minded code, and communicating tradeoffs under time

302 Questions 1 Company07.06.2026
Showing 20 results
Role
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Medium
Software Engineer

Compute interval mode, BST range sum, exclusive time

You are given several independent coding tasks. A) Most frequent integer covered by intervals You are given an integer range [-M, M] and a list of inc...

Coding & Algorithms
2
0
40 people solved
Oct 2, 2025
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Meta
Medium
Machine Learning Engineer

Compute nested depth sum and grid distance

Problem A: Weighted sum of integers in a nested list You are given a nested list structure that may contain integers or other nested lists. Define the...

Coding & Algorithms
9
0
68 people solved
Dec 15, 2025
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Meta
Medium
Software Engineer AI

Maximize Unique Characters from Words

You are given a list of lowercase English words. Select a subset of the words such that no character appears more than once across all selected words....

Coding & Algorithms
1
0
13 people solved
Mar 17, 2026
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Meta
Medium
Software Engineer

Find kth largest element in array

Question Given an unsorted array of integers nums and an integer k, return the k-th largest element in the array. The 1st largest element is the maxim...

Coding & Algorithms
4
0
58 people solved
Dec 8, 2025
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Meta
Medium
Software Engineer

Merge overlapping intervals

You are given a list of closed intervals on the number line, where each interval is represented as a pair of integers [start, end] with start <= end. ...

Coding & Algorithms
4
0
48 people solved
Dec 8, 2025
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Meta
Easy
Data Scientist

Compute maximum score using up to 3 categories

Problem A library runs a summer reading program. Each book a student reads earns a certain number of points, and each book belongs to a category. A st...

Coding & Algorithms
5
0
72 people solved
Dec 2, 2025
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Meta
Medium
Software Engineer

Remove minimum parentheses to balance string

Given a string s containing lowercase letters and the characters '(' and ')', remove the minimum number of parentheses so that the resulting string is...

Coding & Algorithms
1
0
37 people solved
Sep 6, 2025
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Meta
Medium
Software Engineer

Implement merge-in-place and group cyclic-equivalent strings

You are given two ascending arrays to merge in place and a separate grouping task: Part A — In-place merge without known sizes: - Array A contains sor...

Coding & Algorithms
5
0
48 people solved
Sep 6, 2025
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Meta
Medium
Machine Learning Engineer Locked

Find longest palindromic substring

This question evaluates knowledge of string algorithms and pattern recognition, focusing on identifying palindromic substrings and reasoning about tim...

Coding & Algorithms
6
0
67 people solved
Nov 28, 2025
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Meta
Hard
Machine Learning EngineerSenior+ AI Locked

Build a Friend Recommender

This question evaluates proficiency in graph algorithms, recommendation system logic, input validation, metric design, and test-driven software implem...

Coding & Algorithms
3
0
46 people solved
Mar 1, 2026
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Meta
Hard
Machine Learning EngineerSenior+ AI Locked

Find Words Containing Other Words

This question evaluates string-processing skills, knowledge of substring matching techniques and supporting data structures, and the ability to analyz...

Coding & Algorithms
1
0
30 people solved
Mar 1, 2026
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Meta
Medium
Machine Learning Engineer Locked

Solve Merge Lists and Vertical Traversal

This question evaluates proficiency with merging sorted linked lists and performing vertical traversal of binary trees, focusing on algorithms, data s...

Coding & Algorithms
7
0
51 people solved
Feb 28, 2026
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Meta
Easy
Machine Learning EngineerSenior+ Locked

Solve Tree Views, Columns, and Calculator

This multi-part question evaluates skills in binary tree traversal and view extraction, vertical column grouping and ordering of tree nodes, and parsi...

Coding & Algorithms
3
0
35 people solved
Feb 27, 2026
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Meta
Medium
Software Engineer

Group a tree by vertical columns

Group a tree by vertical columns Given the root of a binary tree, produce a vertical listing of nodes: assign each node an x-coordinate (root at x=0; ...

Coding & Algorithms
2
0
32 people solved
Aug 7, 2025
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Meta
Medium
Software Engineer

Solve PTO window and sparse unique counting

Solve PTO window and sparse unique counting Design algorithms for two problems: A) Longest vacation with limited PTO: Given an array A of characters w...

Coding & Algorithms
2
0
38 people solved
Aug 1, 2025
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Meta
Medium
Software Engineer

Design LRU cache and pick k closest points

Design LRU cache and pick k closest points 1) Design a fixed-capacity in-memory cache that evicts the least recently used key when full. Support get(k...

Coding & Algorithms
6
0
60 people solved
Jul 29, 2025
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Meta
Hard
Software Engineer

Remove minimum invalid mixed brackets

Given a string s containing letters and bracket characters from the set (), [], {}, remove the minimum number of bracket characters so that the result...

Coding & Algorithms
7
0
66 people solved
Feb 17, 2026
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Meta
Hard
Software Engineer

Connect next pointers for each tree level

You are given the root of a binary tree where each node has fields left, right, and next (initially null). For every node, set its next pointer to the...

Coding & Algorithms
2
1
27 people solved
Feb 17, 2026
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Meta
Easy
Machine Learning Engineer Locked

Solve four OA string/array/matrix/graph tasks

This multi-part prompt evaluates proficiency in core programming competencies: string parsing and character classification, simulation/greedy processi...

Coding & Algorithms
10
0
77 people solved
Feb 12, 2026
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Meta
Medium
Machine Learning Engineer Locked

Solve frequency and tree-completeness problems

These two problems evaluate competency in frequency counting and selection algorithms for identifying top-k elements and in binary tree structure anal...

Coding & Algorithms
4
0
58 people solved
Feb 12, 2026

Frequently Asked Questions

How difficult are Meta Coding & Algorithms interview questions?
Meta Coding & Algorithms questions are typically rated medium to hard and often grow tougher as you progress through rounds. Early screens usually aim to confirm correct problem solving and implementation ability, while onsite interviews expect robust algorithmic thinking, time and space optimality, and clear communication under pressure. Interviewers evaluate how you approach unfamiliar problems, move from brute force to optimized solutions, handle edge cases, and articulate complexity trade‑offs. Preparation should target speed, pattern recognition, and producing clean, testable code that can be reasoned about aloud during the interview.
Where in Meta's interview process do Coding & Algorithms questions appear, and how are they evaluated?
Coding and algorithms questions commonly appear in phone screens, technical online assessments, and the core onsite/virtual loop; they may be mixed with product or design conversations depending on role. Evaluations focus on problem decomposition, correctness, algorithmic efficiency, and code quality. Interviewers listen for clear problem statements, thoughtful trade‑offs, and how you validate solutions against edge cases and constraints. For more senior roles, emphasis shifts to selecting the right abstractions and reasoning about large inputs and performance. Communication, testing, and the ability to iterate from a simple approach to an optimized one are all part of the score.
How should I plan my interview preparation timeline for Meta Coding & Algorithms roles?
A disciplined timeline usually spans six to twelve weeks depending on experience and starting point. Begin with two to three weeks of fundamentals: solidify data structures, complexity analysis, and core algorithms. Follow with four to six weeks of focused practice on medium and hard problems, rotating topics and timing yourself, while documenting patterns and common mistakes. In the final two weeks, emphasize mock interviews, timed coding rounds, and refining communication and testing habits. Regularly review incorrect solutions to identify recurring gaps, and incorporate at least a few live mock interviews to habituate speaking through your thought process.
What key subtopics within Coding & Algorithms should I focus on for Meta interviews?
Concentrate on arrays and strings, trees and graphs (including BFS/DFS), hash maps, two‑pointer and sliding window techniques, recursion and backtracking, dynamic programming, and sorting/search algorithms. Also prepare on complexity analysis, space‑time tradeoffs, handling NULLs and edge cases, and writing robust test cases. For higher levels, emphasize understanding of algorithmic scalability, memory layout implications, and performance tuning. Equally important are clear coding style, readable variable names, and the ability to explain why a chosen data structure or algorithm best fits the constraints of the problem.
What standout tips, common pitfalls, and final advice for Coding & Algorithms interviews at Meta?
Start each problem by asking clarifying questions and describing a brute‑force approach before optimizing. Verbally outline your plan, write clean code with basic tests, and explain complexity at the end. Common pitfalls include diving into coding without validating edge cases, ignoring constraints, and failing to communicate assumptions. Avoid overfitting to memorized problems; instead, internalize patterns so you can adapt. Use mock interviews to sharpen pacing and feedback. Finally, remain calm if stuck: state hypotheses, try small examples, and iterate—interviewers value structured thinking and recoveries as much as perfect first attempts.

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