LinkedIn Coding & Algorithms Interview Questions

LinkedIn Coding & Algorithms interview questions typically focus on clean, production-minded problem solving rather than trick puzzles. Interviews evaluate algorithmic thinking, data-structure choice, complexity trade‑offs, and communication: you’ll be expected to write correct, readable code in a shared editor (CoderPad or similar), explain time/space complexity, and walk through edge cases and tests. Expect an initial 45–60 minute technical screen with one or two coding problems and a later virtual onsite with multiple rounds that probe depth, follow-up optimizations, and your ability to iterate under feedback. For effective interview preparation, practice core patterns (two pointers, sliding window, DFS/BFS, heaps, dynamic programming) and rehearse explaining your thought process aloud while coding. Time-boxed mock interviews replicate pressure and reveal gaps; review common pitfalls like off‑by‑one errors, null handling, and inefficient data structures. Emphasize clear variable names, incremental testing, and trade‑off discussion during the interview—these signal seniority and team fit as much as a correct final solution.

51 Questions 1 Company06.23.2026
Showing 20 results
Role
LinkedIn logo
LinkedIn
Medium
Software Engineer

Process Mutable Matrix Sum Queries

You are given a 2D integer matrix and a list of queries. There are two query types: - set r c v: update the value at row r and column c to v - get r1 ...

Coding & Algorithms
2
0
27 people solved
Apr 6, 2026
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer Locked

Implement K-Means and Explain Convergence

Implement K-means clustering in Python and explain convergence. Covers assignment and update steps, stopping criteria, empty clusters, objective funct...

Coding & Algorithms
6
0
45 people solved
May 3, 2025
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer

Generate uniform 0–6 from biased coin

You are given a function: - int getRandom01Biased() returns 0 with probability p and 1 with probability 1-p, where p is unknown and may be any value i...

Coding & Algorithms
14
0
109 people solved
Feb 18, 2026
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

Solve Cache, Window, and Heap Problems

You may be asked to solve multiple algorithmic problems in coding rounds: 1. Frequency-based cache: Implement a cache with get(key) and put(key, value...

Coding & Algorithms
0
0
14 people solved
Feb 16, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Compute inverse-depth weighted sum of nested lists

Inverse-Depth Weighted Sum of a Nested List You are given a nested list of integers. Each element is either: - an integer, or - another nested list. D...

Coding & Algorithms
19
1
127 people solved
Feb 11, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Analyze time and space complexity

Analyze time and space complexity For any algorithm you implement, analyze its time and space complexity using Big-O notation. Derive and justify the ...

Coding & Algorithms
5
0
60 people solved
Jul 31, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Find the k-th largest element in an array

Given an integer array nums and an integer k, return the k-th largest element in the array. Notes: - The k-th largest element is the element that woul...

Coding & Algorithms
11
0
87 people solved
Nov 21, 2025
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+ Locked

Solve substring and top‑K pair problems

This multi-part question evaluates algorithm design and data-structure proficiency across string processing (minimum window substring), pair-selection...

Coding & Algorithms
11
0
82 people solved
Oct 13, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Minimize adjacent-color assignment cost

Minimize adjacent-color assignment cost You are given H linear items (e.g., houses) and an H×C cost matrix where cost[i][c] is the cost of assigning c...

Coding & Algorithms
4
0
82 people solved
Aug 10, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Count islands and distinct shapes

Question LeetCode 200. Number of Islands LeetCode 694. Number of Distinct Islands https://leetcode.com/problems/number-of-islands/description/ https:/...

Coding & Algorithms
4
0
20 people solved
Jul 29, 2025
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer

Find shortest word transformation with caching

Find shortest word transformation with caching You are given a start word and an end word of equal length, and a dictionary of valid words. In one mov...

Coding & Algorithms
10
0
95 people solved
Jul 16, 2025
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer

Compute total covered interval length

Compute total covered interval length Given a list of integer intervals [l, r) (half-open), compute the total length covered by at least one interval....

Coding & Algorithms
13
0
107 people solved
Jul 16, 2025
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

Design a Randomized Multiset

Implement a data structure for integers that allows duplicate values and supports the following operations in expected O(1) time: - insert(val): Add o...

Coding & Algorithms
3
0
43 people solved
Apr 2, 2026
LinkedIn logo
LinkedIn
Easy
Software Engineer AI Locked

Debug Queues and Solve Arrays

This multi-part question evaluates competencies in data structures (heap invariants and in-place array manipulation), concurrent programming (designin...

Coding & Algorithms
7
0
96 people solved
Mar 10, 2026
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer

Sample index from weighted probability distribution

Given an array weights[0..M-1] representing a discrete distribution over M outcomes, implement a function sampleIndex(weights) that returns an index i...

Coding & Algorithms
4
0
77 people solved
Feb 18, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Design O(1) insert/delete and frequency-weighted random

Problem Design a data structure that supports the following operations in average \(O(1)\) time: 1. add(x) -> bool - Inserts value x into the colle...

Coding & Algorithms
14
1
199 people solved
Feb 12, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Check perfect square using binary search

Perfect Square Check (Binary Search) Given a positive integer n, determine whether it is a perfect square (i.e., there exists an integer x such that x...

Coding & Algorithms
10
2
145 people solved
Feb 11, 2026
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer Locked

Sample index from probability distribution

This question evaluates proficiency in randomized algorithms and probability-based sampling, along with algorithmic preprocessing and data-structure d...

Coding & Algorithms
31
0
217 people solved
Feb 11, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer Locked

Find dictionary words matching a phone digit string

This question evaluates familiarity with phone-keypad character-to-digit mappings, string pattern matching, and efficient filtering of dictionary word...

Coding & Algorithms
11
1
109 people solved
Jan 12, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

Design a stack with max removal

Design a stack-like data structure for integers that supports the following operations efficiently: - push(x): insert x onto the stack. - pop(): remov...

Coding & Algorithms
4
0
53 people solved
Jan 1, 2026

Frequently Asked Questions

How difficult are LinkedIn Coding & Algorithms interview questions?
LinkedIn Coding & Algorithms interview questions typically span a range from easy to hard, but many land in the medium-to-hard category for software engineering roles. Interviewers are less interested in memorized solutions and more focused on your ability to decompose problems, reason about complexity, and deliver correct, well-tested code under time constraints. Expect algorithmic patterns like two pointers, DFS/BFS, heaps, and dynamic programming to appear, often with additional constraints that push you to optimize. If you can clearly explain tradeoffs, write clean code and handle edge cases, you’ll be well positioned even for tougher problems.
What is the typical LinkedIn interview process and where do Coding & Algorithms questions appear?
LinkedIn’s technical hiring process usually begins with a recruiter screen and then one or more technical interviews that include Coding & Algorithms challenges. These problems commonly appear in online assessments or take-home tasks used early to filter candidates, in remote technical phone or video screens where you code in a shared editor, and in onsite or final loop interviews where two focused coding rounds assess algorithmic problem solving. Depending on level, you may also face system design or behavioral interviews, but Coding & Algorithms is the throughline for most engineering roles and is evaluated at multiple stages.
How long should I prepare for LinkedIn Coding & Algorithms interviews (timeline)?
Preparation time varies by experience and current skill level, but a focused six to twelve week plan is a practical target for most candidates preparing for LinkedIn Coding & Algorithms interviews. Early weeks should refresh core data structures and algorithmic patterns, the middle weeks should emphasize solving representative problems and timed practice on shared editors, and the final weeks should focus on mock interviews, systematizing common templates, and polishing communication. If you’re already strong, three to four weeks of deliberate practice and mock interviews can suffice. Consistent, deliberate practice beats last-minute cramming.
What key subtopics within Coding & Algorithms should I prioritize for LinkedIn interviews?
Prioritize mastery of arrays and strings, pointer techniques and sliding windows, hash maps for frequency and lookup problems, and linked lists for in-place manipulations. Trees and graphs with BFS/DFS, common traversal patterns, and shortest-path reasoning are frequently tested. Dynamic programming and greedy approaches appear on more challenging problems, while heap and priority-queue use cases and union-find show up in specialized tasks. Equally important are understanding algorithmic complexity, writing correct edge-case handling for nulls and bounds, and producing readable, testable code that an interviewer can follow and discuss.
Any standout tips and common pitfalls for LinkedIn Coding & Algorithms interviews?
Start each question by asking clarifying questions and restating constraints so you and the interviewer share expectations. Sketch a clear approach before coding; if time is limited, implement a correct brute force then iterate to an optimized solution while explaining tradeoffs. Test with example inputs including edge cases and watch for off-by-one errors, null values, and overflow. Avoid over-optimizing prematurely and don’t get stuck on micro-optimizations that obscure correctness. During remote rounds, practice in the collaborative editor you’ll use and communicate continuously: silence is often interpreted as confusion, so narrate decisions and invite feedback when uncertain.

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