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.

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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
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 ...
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...
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...
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...
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...
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 ...
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...
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...
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...
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:/...
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...
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....
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...
Debug Queues and Solve Arrays
This multi-part question evaluates competencies in data structures (heap invariants and in-place array manipulation), concurrent programming (designin...
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...
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...
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...
Sample index from probability distribution
This question evaluates proficiency in randomized algorithms and probability-based sampling, along with algorithmic preprocessing and data-structure d...
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...
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...