Coding & Algorithms Interview Questions
Practice 3,469 real coding and algorithms interview questions reported from interviews at Meta, Amazon, Google, Uber and Microsoft. The mix follows what these loops actually ask: arrays and strings, hash maps, two pointers and sliding windows, binary search, linked lists, trees and graphs, BFS and DFS, recursion and backtracking, dynamic programming, heaps and priority queues, and the occasional design-a-data-structure round. Roughly four in five are rated medium, which is where most technical screens sit; 477 are hard and cluster in onsite loops. 3,033 of them open in a console where you can run your solution against the test cases in Python, Java, C++ or JavaScript. 2,712 come from Software Engineer interviews, with the rest from Machine Learning Engineer, Data Scientist and Data Engineer loops, and 404 were set as take-home projects rather than live sessions.
"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."
Implement a CSV dataset join
Implement joinDataSet(fieldName, customerFile, processorFile, skipUnmatched). You are given two datasets represented as List<String>, where: - custome...
Find minimum time to cross bridge with flashlight
This question evaluates algorithmic problem-solving and optimization skills, including modeling constrained state transitions, reasoning about trade-o...
Find smallest common organization for employees
The question evaluates competency in hierarchical and graph data structures, including tree lowest-common-ancestor reasoning, DAG ancestor minimality,...
Maintain median of a data stream
Design a data structure that supports: - addNum(int x): Add an integer from a stream. - findMedian(): Return the median of all inserted numbers so far...
Implement Three Research Coding Tasks
This multi-part question evaluates skills in differentiable linear algebra and automatic differentiation safety, memory- and buffer-aware numerical im...
Design a circular queue data structure
This question evaluates understanding of circular buffer data structures and the ability to implement fixed-capacity queue operations with O(1) time a...
Support room moves and query top-k fastest
This question evaluates understanding of dynamic data structure design and ordering semantics, specifically maintaining per-room FIFO arrival order, c...
Implement trie-based autocomplete
This question evaluates understanding and implementation of trie data structures for prefix-based retrieval, testing competencies in string algorithms...
Solve common array/graph interview problems
This multi-part question evaluates proficiency in array and matrix manipulation, graph traversal and shortest-path reasoning for word transformations,...
Implement CSAT tracking and call timing
This question evaluates skills in designing efficient streaming/rolling-window data structures and stateful updates for real-time metrics, alongside p...
Find max node-value range across components
This question evaluates understanding of undirected graph connectivity and component-wise aggregation, specifically the ability to identify connected ...
Compute distance to nearest taxi in grid
This question evaluates understanding of graph traversal and shortest-path reasoning on grids, algorithmic problem-solving for computing distances fro...
Compute infection spread time
This question evaluates understanding of grid-based graph traversal and propagation dynamics, testing competencies in breadth-first search concepts, s...
Return nodes on a tree diameter path
This question evaluates understanding of graph algorithms and tree properties, specifically the ability to identify and reconstruct a longest simple p...
Design a token manager with lazy expiration
This question evaluates time-based data structure design and algorithmic reasoning for managing expiring items, focusing on hashing, timestamp orderin...
Solve Two OA Algorithm Problems
The post describes two separate coding questions from an online assessment: 1. Greedy deletion by minimum value Given an integer array nums, repeate...
Parse a protobuf-like schema and answer queries
This question evaluates proficiency in parsing grammar-like schemas, scope-based name resolution for nested types, symbol-table construction, and desi...
Solve jump maximization and palindromic path queries
This pair of problems evaluates algorithmic problem-solving skills: the first assesses array-based path optimization and stateful score maximization u...
Find maximum-occurring character in a string
This question evaluates proficiency in string manipulation and frequency counting, including correct handling of tie-breaking by earliest first occurr...
Convert an IP range to minimal CIDRs
This question evaluates understanding of IPv4 address encoding, binary and bitwise operations, and optimal interval covering for expressing consecutiv...