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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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

"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."
Merge two N-ary trees by key rules
You are given two N-ary trees A and B. Each node has: - key (string): unique among siblings (i.e., within a node’s children list, no two children shar...
Solve six algorithmic problems
Answer the following independent algorithmic prompts. For each, explain your approach, justify data structures, analyze time/space complexity, and pro...
Solve common string and subarray problems
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Find the k-th largest element in an array
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Implement a stack supporting max and popMax
Design a data structure that behaves like a stack but also supports retrieving and removing the current maximum value. Implement a class MaxStack with...
Count connected land components in a grid
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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...
Implement fast sampling for weighted k-sided die
You must sample from a categorical distribution over k outcomes with probabilities p1..pk (sum to 1) without using built-in categorical samplers. You ...
Group words that map to same phone digits
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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 move you may change exactly one letter to form a n...
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 color c to item i. Adjacent items cannot ...
Compute graph distance and impacted services
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Compare heap and stack memory
Compare heap and stack memory. Explain how each is allocated and freed, typical lifetimes of data stored there, access patterns and performance charac...
Find k closest values in a BST
Given a binary search tree with n nodes and a real target t, return k node values whose distances to t are smallest. Implement an algorithm with O(log...
Validate parentheses with one or three bracket types
Problem Given a string s consisting only of bracket characters, determine whether it is valid. A string is valid if: - Every opening bracket has a cor...
Solve substring and top‑K pair problems
Problem A: Smallest window containing all characters Given two strings s and t, find the shortest substring of s that contains all characters of t wit...
Implement stream random sampling in Python
You are given an unbounded stream of items that cannot be stored entirely in memory. Write Python code to maintain a uniform random sample from the st...
Analyze time and space complexity
For any algorithm you implement, analyze its time and space complexity using Big-O notation. Derive and justify the best, average, and worst-case comp...
Differentiate Java final, finalize, finally
Differentiate Java's final, finalize, and finally. Define what final means for variables, methods, and classes and give examples; explain what finaliz...
Determine sanitized palindrome in string
Write a function that determines whether a string is a palindrome after removing non-alphanumeric characters and ignoring case (e.g., punctuation, whi...