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"
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"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."
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"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."
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"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."
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...
Implement a Lazy Array
This question evaluates understanding of lazy evaluation and deferred computation, implementation of iterator/generator-like abstractions, and the abi...
Crawl Same-Domain Links
Implement a Python function that crawls a website starting from a seed URL and returns all unique pages reachable within the same domain. Assume a hel...
Implement an expiring counter class
This question evaluates a candidate's competency in implementing a sliding-window expiring counter, testing knowledge of streaming algorithms, data st...
Support updates and count target-sum pairs
This question evaluates data structures and algorithmic skills for dynamic pair counting, focusing on frequency management, efficient update handling,...
Validate parentheses and find k-th largest
This pair of problems evaluates mastery of fundamental data structures and algorithmic techniques: Problem A tests understanding of stack-based parsin...
Reconstruct route from unordered travel tickets
This question evaluates understanding of directed graph concepts and sequence reconstruction, assessing the ability to reason about ordered relationsh...
Add two integer strings using digit-adder
This question evaluates proficiency in string-based arithmetic, digit-wise addition, carry propagation, and management of arbitrarily large non-negati...
Build message schema parser with size/type queries
This question evaluates parsing of a simple message schema, construction of mappings from field names to primitive types and byte sizes, and computati...
Compute total time to finish all courses
This question evaluates competency in graph algorithms and scheduling, including dependency resolution, cycle detection, and aggregation of task durat...
Minimize travel time with optional meeting point
This question evaluates a candidate's understanding of graph shortest-path computation and meeting-point optimization, testing skills in handling weig...
Validate a JSON-like string
This question evaluates parsing and string-processing skills, focusing on structural validation of JSON-like text including matching and nesting of br...
Minimize reduction cost and validate equal-sum pairs
This two-part question evaluates array manipulation and algorithmic problem-solving skills: the first task focuses on optimizing cumulative operation ...
Find where to cut cake into equal areas
This question evaluates geometric area computation, handling of piecewise-constant profiles formed by adjacent rectangles, and attention to numerical ...
Find viewing direction that sees most points
This question evaluates computational geometry skills, angular normalization and counting within a sector, and the ability to design algorithms that s...
Resolve user roles across account hierarchy
This question evaluates understanding of hierarchical data structures, role-based access control semantics, and set/map operations for computing effec...
Calculate transaction fees from CSV records
This question evaluates parsing and processing of structured transaction data, implementing multi-dimension fee computation rules (provider-, transact...