Coding & Algorithms Interview Questions
Practice 3,469 real Coding & Algorithms interview questions for 2026. Covers companies like Meta, Amazon, Google, Uber, and Microsoft. Real questions from actual interviews with detailed solutions — ideal for focused interview preparation. Coding & Algorithms interview questions are the single most common technical gate for software engineering roles and are used to evaluate problem framing, algorithm selection, complexity trade-offs, correctness, edge-case reasoning, and clear communication under time pressure. Expect this category to appear in early technical screens and repeatedly across onsite loops at companies that weight it heavily (notably Meta, Google, and Amazon). Interviews will test arrays and strings, trees and graphs, dynamic programming, hashing and two‑pointer techniques, and the candidate’s ability to test and optimize code in a shared editor. Prepare with timed mock interviews, practice in the same editor you’ll use live, and build a progressive schedule that moves from fundamentals to medium/hard problems; typical candidates invest several weeks to a few months of focused practice depending on seniority and target company.
"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."
Measure Water Trapped Between Elevations
Measure Water Trapped Between Elevations Given a list of nonnegative integer elevations where each bar has width one, return the total number of unit ...
Evaluate a Formula AST with Variables
Evaluate a Formula AST with Variables Extend a Boolean-formula evaluator so the AST may contain variable references. Resolve each variable from a supp...
Find a Valid Course Order
This question evaluates graph algorithm skills—specifically topological ordering, directed cycle detection, and analysis of time and space complexity....
Compute Graph Spread and Portfolio Trades
This question evaluates graph traversal and data-manipulation competencies, combining connected-component analysis on undirected graphs with map-based...
Implement a Sparse Matrix Class
This question evaluates the ability to design and implement efficient sparse data structures and perform matrix operations, testing knowledge of spars...
Build a Searchable Sentence Index
This question evaluates a candidate's ability to design and implement in-memory text indexes and related data structures, covering inverted indexing, ...
Implement Last-Click Attribution APIs
This question evaluates a candidate's ability to implement stateful, time-windowed event matching and attribution, testing skills in data structures, ...
Solve Flower Placement and Directory Deletion
This question evaluates combinatorial constraint-satisfaction and permutation/matching skills for the flower-placement grid alongside filesystem trave...
Expand Nested Repetition Expressions
This question evaluates understanding of string parsing and nested structure handling, including skills in recursion, stack-based parsing, tokenizatio...
Implement Memory Allocation and In-Memory Records
This question evaluates implementation skills in memory management and in-memory data modeling, covering first-fit allocation semantics, free/merge be...
Find Neighboring Records by Identifier
This question evaluates understanding of ordered data traversal and efficient lookup design, assessing competency with data structures, indexing and r...
Count Squares Formed by Segments
Count Squares Formed by Segments You are given axis-aligned line segments with integer coordinates. Each segment is represented by two endpoints. One ...
Implement Store Autocomplete
This question evaluates string matching, prefix search, and data structure selection skills by requiring an autocomplete method that returns entries b...
Simulate a Rank-Based Tournament
This question evaluates ability to simulate tournament pairing and single-elimination progression using array manipulation and data structures while p...
Implement Several Core Algorithmic Components
This multi-part problem evaluates core competencies in data structures and algorithm design (LRU cache, grid pathfinding and earliest-feasible-time an...
Merge Overlapping Time Intervals
You are given a list of closed time intervals. Each interval is represented as [start, end], where start <= end. Write a function that returns the sma...
Implement EMA Crossovers and Root Solvers
This question evaluates time-series data manipulation and vectorized pandas operations for EMA crossovers, numerical methods and error analysis for im...
Implement Interval Overrides and Top-K Strings
This question evaluates interval manipulation and merging for half-open time ranges with overrides, plus frequency-counting and top-k string selection...
Filter People by Optional Criteria
Filter People by Optional Criteria Implement filter_people(people, min_age, max_age, occupations, min_salary, max_salary). Each item in people is a di...
Merge Accounts by Shared Email
Merge Accounts by Shared Email Each account record begins with a person's name followed by one or more email addresses. Two records belong to the same...