Software Engineer Coding & Algorithms Interview Questions
Practice 2,306 real Coding & Algorithms interview questions for Software Engineer roles. From companies including Meta, Amazon, Google, Uber, Microsoft.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"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."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"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."
Simulate turn-based monster team battle
Design an object-oriented model and implement the core battle logic for a turn-based fight between two teams of monsters. The system should simulate t...
Find all cells reachable by downhill flow
Problem You are given an m x n grid heights, where heights[r][c] is the elevation of cell (r, c). A drop of water is placed at a starting cell start =...
Maximize palindromic strings after character swaps
You are given an integer n and an array of n lowercase strings arr. Operation (can be performed any number of times): choose two different strings arr...
Count Nodes Using Asynchronous Messages
You are given the identifier of a root node in a distributed network. Each node represents a separate machine. A node cannot directly inspect another ...
Decode an encoded string
Implement a decoder for an encoded string where repetition is expressed with a number followed by a bracketed substring. Rules: - A pattern k[substrin...
Implement a banking operations system
Implement a simple banking system that manages multiple accounts with initial balances. Support operations: deposit(accountId, amount), withdraw(accou...
Design a trie-based URL router with wildcards
Question Implement a URL routing matcher that supports adding route patterns and matching request paths, using a trie (prefix tree) as the core data s...
Implement an article voting tracker
Coding: Article Voting Tracker Design and implement a data structure to track users’ votes (upvote/downvote) on articles. Operations Implement functio...
Find gaps between intervals
You are given a list of integer intervals intervals, where each interval is represented as [start, end] (inclusive), and start <= end. Two intervals m...
Solve Stack Decoding and Fuel-Constrained Paths
You are given two independent coding tasks. Task 1: Decode a Repeated-Pattern String Given a valid encoded string, return its fully decoded form. The ...
Implement KV Store and Token Bucket
The coding portion covered two implementation tasks: 1. Implement a simple in-memory key-value store. Support basic operations such as: - put(key, val...
Find smallest common organization for employees
You are given an organization structure and employee-to-organization membership. Define any reasonable data structures you need. Part 1 (base) Assume ...
Implement A* Maze Search
Implement maze pathfinding in C++. You are given an m x n grid where '.' is an open cell, '#' is a wall, S is the start, and T is the target. You may ...
Find Duplicate Files
Implement a file deduplication tool. You are given a root directory containing many files. Return groups of duplicate files. Two files are duplicates ...
Sum palindrome-change costs over all substrings
This is a three-part coding screen. Each part is independent — a string-algorithms problem, a SQL aggregation problem, and a shell-parsing problem — a...
Compute peak parking lot occupancy intervals
You are given logs from a parking lot system. Each log entry has the form: [carId, time, eventType] - carId is an integer identifying a car. - time is...
Return a Package Build Order
You are given an API: `python get_dependencies(package) -> list[str] ` It returns the direct dependencies of a given package. If package A depends on ...
Implement an LRU cache
Problem Design and implement an LRU (Least Recently Used) cache that supports the following operations in average O(1) time: - get(key) -> value: Retu...
Find Shortest Paths to Target Nodes
You are given a weighted directed graph representing distances between nodes. - There are n nodes labeled from 0 to n - 1. - edges[i] = [u, v, w] mean...
Implement an LRU cache
Problem: LRU Cache Design and implement a data structure that supports an LRU (Least Recently Used) cache with a fixed capacity. Requirements Implemen...