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."
Implement a Unique Lines Command
Implement a simplified version of the Unix uniq command. Given an input text file, output the file contents with consecutive duplicate lines collapsed...
Find User Airport at a Time
You are given a list of flight records. Each record contains: - user_id: the traveler identifier - departure_airport: the airport where the flight sta...
Implement a Recipe Cart
You are building a shopping cart for a cooking app. The system is initialized with: - A recipe catalog: each recipe_name maps to a list of ingredients...
Add One to Digit Array
You are given an array of decimal digits representing a non-negative integer. The most significant digit is at index 0, and the array contains no lead...
Fix a Corrupted Bootloader Instruction
You are given a bootloader program as a list of text instructions. Each instruction has an opcode and a signed integer value, such as plus +1 or jump ...
Collapsible Code Editor: Brace Matching and Toggle
Collapsible Code Editor: Brace Matching and Toggle You are building a feature for a code editor. The editor holds source code written in a curly-brace...
Least Frequently Used (LFU) Cache
Least Frequently Used (LFU) Cache Design and implement a data structure for a Least Frequently Used (LFU) cache that supports get and put operations i...
Course Schedule Feasibility
Course Schedule Feasibility You are registering for numCourses courses, labeled 0 to numCourses - 1. Some courses have prerequisites: before you can t...
Implement Employee Management and Expression Evaluation
You are asked to solve two independent coding tasks. Task 1: Employee management hierarchy Implement an EmployeeDirectory class that maintains a compa...
Shortest Path in a Grid with Blocked Cells
Shortest Path in a Grid with Blocked Cells You are given an m x n grid that represents a floor plan. Each cell is one of: - 0 — an open cell you can w...
Implement an In-Memory File System
Implement an in-memory file system directory management tool. Your tool should support the following operations: 1. Create a file in a directory. 2. C...
Infection Spread on a Grid (Cellular Automaton)
Infection Spread on a Grid (Cellular Automaton) You are simulating how an infection spreads across a 2D grid of cells over a sequence of discrete time...
Implement stream queries and bounded-difference subarrays
Solve both coding tasks. Task 1: Track the first non-repeated number in a stream Design a data structure that supports a stream of integers. Implement...
Implement 2048 Game Logic
Implement the core movement logic for the 2048 game. You are given an n x n integer board where 0 represents an empty cell and every nonzero value rep...
Design an in-memory banking system
Implement an in-memory banking system (e.g., in Java) that supports the following operations on user accounts. Assume user IDs are unique strings and ...
Implement Courier Delivery Cost Tracking
Design and implement a small in-memory cost-tracking service for food-delivery couriers. Each courier has a unique driverId and an hourlyRate. A deliv...
Count Candies from Unlockable Boxes
You are given an object-oriented representation of boxes in a house. Initially, exactly one box is physically accessible. Each Box has: - A unique id....
Minimize Circular Redistribution Cost
You are given n warehouses arranged in a circle. products[i] is the number of products initially stored at warehouse i. You may choose exactly one glo...
Boolean Expression Tree with Leaf Flips
Boolean Expression Tree with Leaf Flips You are given a boolean expression represented as a tree. - Each leaf node holds a boolean value: true or fals...
Implement a Circular Buffer
Implement a fixed-capacity circular buffer. A circular buffer stores elements in insertion order, supports removal of the oldest element, and reuses s...