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."
Flatten and unflatten nested Python structures
This question evaluates proficiency in manipulating nested data structures, deterministic traversal and mapping between hierarchical shapes and flat i...
Group words that map to same phone digits
Problem On a classic phone keypad (T9), letters map to digits: - 2: ABC, 3: DEF, 4: GHI, 5: JKL, - 6: MNO, 7: PQRS, 8: TUV, 9: WXYZ Given a list of lo...
Reverse a Singly Linked List
Reverse a finite singly linked list represented by nested two-item Python lists. Reuse the existing node objects without allocating replacements, and ...
Find Conflicting Events
This question evaluates algorithmic problem-solving in coding and algorithms, focusing on grouping, sorting, and sliding-window techniques applied to ...
Kth Largest Perfect Binary Subtree
This question evaluates a candidate's ability to combine tree traversal with structural validation, requiring recognition of perfect binary subtrees a...
Implement Stock Price Query APIs
You are given an initial collection of stock price records. Each record contains: - symbol: a stock name or ticker string - timestamp: initially a cal...
Implement Server Number Allocation
This question evaluates the ability to design efficient stateful data structures and algorithms for resource allocation, focusing on management of per...
Find the Kth Largest in Two Sorted Arrays
You are given two arrays sorted in ascending order and an integer k. Return the kth largest element among all elements from both arrays combined. Coun...
Build a Flexible Expense Rules Engine
This question evaluates designing extensible rule engines, predicate composition, data modeling for expense- and trip-level aggregation, and reasoning...
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...
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...
Implement 3x3 matrix transforms and rotation
Implement 3x3 matrix transforms and rotation For a 3x3 matrix, write Python code to: (a) transpose it in-place; (b) swap any two rows and any two colu...
Find top-K frequent elements in a stream
You receive a large stream of items (e.g., integers or strings) that may not fit in memory. Design an algorithm that can return the top K most frequen...
Compute Total Manual Distance
This question evaluates array processing, state simulation, and algorithmic reasoning for deterministic stepwise processes, including handling unsorte...
Traverse a Matrix in Spiral Order
Traverse a Matrix in Spiral Order Problem Given an m x n matrix, return all elements in clockwise spiral order. Begin at the top-left corner, move rig...
Simulate In-Place Cellular State Updates
This question evaluates a candidate's ability to implement grid-based state transitions and manage in-place updates with strict space constraints, ass...
Implement a uniq-like function
Implement a function similar to the Unix uniq utility. You are given a sequence of strings representing lines of text in the order they appear in a fi...
Reveal a Minesweeper Board
Implement the reveal operation for a Minesweeper board. Correctly handle mine clicks, numbered cells, and recursive empty-region expansion across all ...
Shortest Path in a Grid with Limited Obstacle Removal
This question evaluates a candidate's ability to extend classic breadth-first search into a state-augmented shortest-path problem, where the state inc...
Maximum Sum Skyline
This question tests algorithmic problem-solving with array optimization under a mountain (single-peak) shape constraint. It evaluates practical applic...