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."
Solve three array/string/graph coding tasks
You are given three separate coding tasks. Implement each as a function. 1) Merge three sorted arrays Input: Three integer arrays A, B, C, each sorted...
Find palindrome-forming string pairs
Given an array of distinct lowercase strings words, return all index pairs (i, j) with i != j such that the concatenation words[i] + words[j] is a pal...
Merge two sorted linked lists
Given the heads of two singly linked lists sorted in non-decreasing order, merge them into a single sorted singly linked list and return its head. Imp...
Parse and evaluate nested expressions with validation
Design and implement a parser/evaluator for a parenthesized expression language where the input string may be invalid. The language uses spaces as tok...
Compute and optimize average wait time
You are given n pickup orders for a grocery delivery counter. Each order i is described by orders[i] = [arrival_i, service_i] in minutes, where arriva...
Implement string matching with follow-up
Question Given a text T and a pattern P, implement a function firstIndex(T, P) that returns the starting index of the first occurrence of P in T, or -...
Solve Five Coding Problems
The interview included several coding tasks. Solve each of the following and discuss time and space complexity: 1. Given a 2D grid where '1' represent...
Implement Disease and Friend Snapshot Models
You are asked to solve two independent coding problems. Problem 1: Simulate disease spread on a contact graph There are n people labeled 0 through n -...
Implement in-memory DB querying
Question Implement an in-memory database that supports: 1. Querying the whole table and returning only selected columns (projection). 2. Adding WHERE ...
Implement cloud storage with quotas and compression
Problem Implement an in-memory cloud storage service that supports multiple users, per-user storage quotas, changing quotas with eviction, and file co...
Implement node messaging and path discovery
You have a network where each node knows only its parent and its children and can send messages to its parent and children. 1) Implement a sendMessage...
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 three interview-style coding tasks
You are given three separate coding tasks, all focused on algorithm and data-structure design. --- Task 1: Longest Bounded-Difference Subarray You are...
Place Pieces on a Grid
Given integers n and m, and an ordered list figures where each element is one of "A", "B", "C", "D", or "E", construct an n x m integer matrix grid. T...
Build a least-recently-used cache
Implement a fixed-capacity key-value cache with least-recently-used eviction. Requirements: - get(key) returns the value for key, or -1 if the key doe...
Implement a sliding-window rate limiter
Problem Design and implement an in-memory rate limiter using a sliding time window. You are given a stream of requests. Each request has: - key (e.g.,...
Compute interval mode, BST range sum, exclusive time
You are given several independent coding tasks. A) Most frequent integer covered by intervals You are given an integer range [-M, M] and a list of inc...
Solve Two OA Coding Problems
The online assessment included two coding problems: 1. In-place character run compression - You are given an array of characters. - Compress con...
Maximize total bandwidth of data channel pairs
You are optimizing how information flows through a network of processing nodes. There are n processing nodes. The bandwidth capability of the i-th nod...
Minimize operations to reduce price difference
You are managing an inventory of products and want to adjust their prices. There are n products. The price of the i-th product is given by an integer ...