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."
Compute product of array except self
Given an integer array nums, return an array out where out[i] equals the product of all elements in nums except nums[i]. Do it in O(n) time using cons...
Find minimum and most frequent number efficiently
Given an unsorted integer array, write functions to: (a) find the minimum value; and (b) find any value that occurs most frequently (if multiple value...
Traverse levels selecting nodes meeting a predicate
Given the root of a binary tree and a predicate P(value) that returns true for certain node values, return a list of lists where the i-th list contain...
Design a constrained in-memory file system
Design an in-memory hierarchical file system. Implement: 1) addFile(String path): Given a UNIX-style absolute path like "/path/to/somewhere/file.txt",...
Solve frequency sort and all-pairs sum
Task 1 — Frequency-based string reorder: Given a string s containing ASCII characters, return a new string whose characters are ordered by decreasing ...
Find and remove duplicate files
Given a directory tree that may not fit in memory, detect and optionally remove duplicate files. Define the algorithm, including how you handle very l...
Find latency pairs with minimal difference
Given an array of integers representing network latencies, return all increasing pairs [a, b] such that b − a equals the minimal absolute difference b...
Implement JSON parsing and HTTP integration tasks
You are completing an “integration” exercise for a mapping service ("BikeMap"). You may use Google, but you must implement everything in code (you can...
Maximize number with one digit swap
Given a non-negative integer n (as an int or string), perform at most one swap of two digits to produce the maximum possible value. Return the resulti...
Find first unique character
Given a lowercase/uppercase alphanumeric string s, return the index of the first character that appears exactly once; if none exists, return -1. Provi...
Merge overlapping intervals
You are given an array of intervals, where each interval is represented as a pair of integers [start, end] with start <= end. The intervals may be uns...
Guide a mouse to find cheese with APIs
You are controlling a mouse in an unknown 2D grid maze. Some cells are blocked (walls), some are open, and at most one open cell contains a piece of c...
Generate outputs for images and pipelines
You are given m input images and n processing pipelines. - Each pipeline is an ordered list of k operations (e.g., resize, rotate, crop, blur, color t...
Detect Winners in Nested Tic-Tac-Toe
Implement functions for two related board-evaluation problems. Part 1: Classic Tic-Tac-Toe Given a 3 x 3 board represented by characters 'X', 'O', and...
Implement a longest-match tokenizer
You are given: - A vocabulary that maps strings to integer token IDs. - An input string text. Tokenize text from left to right using greedy longest-ma...
Find optimal commute mode in a city graph
You are designing a route planner that suggests the best way to commute between two points in a city using different transportation modes. The city is...
Implement Billing Coding Exercises
You are interviewing for a software engineering role at a payments company. The coding rounds focused on practical billing workflows. Implement the fo...
Implement templated string replacement
You are given: 1. A dictionary (map) of placeholder keys to values, for example: `python values = { "db_host": "example.com", "db_port": 5001 } ` ...
Find Kth Unique Maximum
You are given two integer arrays sorted in non-decreasing order. Each array may contain duplicates, and the same value may appear in both arrays. Find...
Build an Expense Policy Rule Engine
Implement a simplified expense-policy rule engine. An expense record contains: - amount: number - category: string - merchant: string - country: strin...