Software Engineer Coding & Algorithms Interview Questions
Practice 2,712 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."
Mark and Compact a Heap-Indexed Subtree
Mark and Compact a Heap-Indexed Subtree An interview report describes an array-encoded tree, marking a target and its descendants with -1, then moving...
Find a Canonical Shortest Round Trip Through Flights
Find a Canonical Shortest Round Trip Through Flights Problem Implement shortestRoundTrip(flights, start) -> route. Each element of flights is a direct...
Deep-Copy a Linked List with Random Pointers
Clone a linked list whose records use arbitrary IDs for next and random pointers. Translate every identity and pointer through supplied fresh IDs whil...
Shortest Path in a Grid with Blocked Cells
This question tests a candidate's practical grasp of graph traversal algorithms applied to 2D grid problems, specifically BFS for unweighted shortest-...
Count Squares from Points in the Plane
Implement count_squares(points). Given distinct 2D points with integer coordinates, count the unique squares whose four corners all occur in the input...
Solve common string and subarray problems
You are given three coding tasks: 1) Reverse a string - Input: a string s. - Output: the string with characters in reverse order. 2) Maximum sum of a ...
Determine Whether P's Position Is Unique
You are given an R x C rectangular grid and a set of named entities. Each entity must be placed in exactly one distinct cell. You are also given a col...
Count Connected Friend Groups
Count Connected Friend Groups You are given an n x n symmetric adjacency matrix. is_connected[i][j] == 1 means person i and person j are directly conn...
Solve tree and DP problems
This coding round contained two algorithm questions: 1. Deepest shared ancestor in a binary tree You are given the root of a binary tree and two ...
Maximize correct guesses in a hat line puzzle
This question evaluates logical reasoning about information constraints, group strategy design, and combinatorial encoding in the Coding & Algorithms ...
Implement follow graph with snapshots and recommendations
Design and implement an in-memory “social network” component that supports following/unfollowing, point-in-time (snapshot) queries, and a simple recom...
Solve stock profit and vertical tree traversal
You have a 60-minute coding interview with two algorithm questions: 1) Max profit from one stock trade - Input: an integer array prices, where prices[...
Solve Rooms and Top-K Streams
This question evaluates algorithmic problem-solving skills across interval scheduling/resource allocation and streaming top-k maintenance, testing com...
Implement crawler, dedup, and persistent LRU
Implement crawler, dedup, and persistent LRU LeetCode 1236. Web Crawler: Crawl web pages starting from a given URL within the same hostname. LeetCode ...
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...
Design an In-Memory Spreadsheet Engine
This question tests a candidate's ability to design a dependency-tracking data structure with efficient cache invalidation, drawing on graph traversal...
Shortest Bridge to Connect Two Islands
You are given an n x n grid where each cell is either water (0) or land (1). Land cells that are adjacent horizontally or vertically belong to the sam...
Solve three algorithmic OA problems
This is an online assessment (Codility-style, 150 minutes) consisting of three independent coding problems. Solve each one separately; they do not sha...
Solve four design-leaning coding problems
You are given four independent interview-style coding tasks. For each task, implement the requested function/class with clear inputs/outputs and reaso...
Merge Message Context Windows
This question evaluates a candidate's skill in designing efficient algorithms and appropriate data-structure use for merging overlapping message conte...