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."
Solve string transform and min-move sorting
This two-part problem evaluates string manipulation and algorithmic problem-solving competencies, specifically rule-based text transformation and comp...
Solve matrix groups and recipe inventory
This pair of problems evaluates block-wise grid processing and aggregation for minimum-value selection alongside dependency-resolution and resource-al...
Compute unique-substring length and first unique index
This question evaluates proficiency in string processing and character-frequency reasoning by combining tasks that measure longest distinct-character ...
Find k-th smallest subarray sum
This question evaluates algorithmic problem-solving skills in array processing, specifically understanding of subarray sum properties, selection and r...
Bracket substrings matching any pattern
This question evaluates string manipulation and pattern-matching competency, including substring search, prioritization rules for leftmost and longest...
Solve linked list, grid BFS, and median queries
This multi-part question evaluates proficiency in in-place linked list manipulation, reasoning about shortest connections between connected components...
Solve sliding window, heap, DP, in-place tasks
This set evaluates proficiency with core algorithmic patterns—sliding-window techniques, heap-based top-k selection, dynamic programming for unbounded...
Merge collinear overlapping 2D segments
This question evaluates computational geometry skills, numerical robustness, and algorithmic implementation for merging collinear, overlapping 2D segm...
Scale Game of Life to huge matrices
This question evaluates a candidate's ability to design space-efficient, I/O-aware algorithms and streaming or external-memory techniques for processi...
Validate JSON against a protobuf-like schema
This question evaluates schema validation and data-typing skills, including understanding of JSON primitive types, recursive message structures, and c...
Evaluate ACL rules for IP and CIDR
This question evaluates a candidate's competency in IP address and CIDR arithmetic, bitwise reasoning, and algorithm design within the Coding & Algori...
Return a topological ordering of a graph
This question evaluates understanding of graph algorithms—particularly topological sorting and cycle detection—and competency in ordering dependencies...
Group GPUs by node and partition by links
This question evaluates understanding of graph algorithms and combinatorial optimization, specifically skills in graph traversal, grouping by node att...
Design playlist with add/remove/shuffle
This question evaluates data structure design and algorithmic complexity skills, focusing on managing dynamic sets, uniform random selection, and aver...
Assign tennis bookings to minimum courts
This question evaluates understanding of interval scheduling and temporal resource allocation, testing algorithm design, complexity analysis, and appr...
Implement an LRU cache
This question evaluates understanding of data structures and algorithmic optimization for constant-time cache operations, with emphasis on cache evict...
Filter ads by a single rule
This question evaluates understanding of rule-based filtering for a single-rule ad filter, including set containment for locations, numeric range chec...
Find longest common subsequence length
This question evaluates understanding of dynamic programming and sequence comparison algorithms by asking for the length of the longest common subsequ...
Implement banking, knapsack, and pagination tasks
This multi-part question evaluates stateful system design, ordered event processing and scheduling semantics for an in-memory banking command processo...
Build a hit/miss word guessing game
This question evaluates implementation skills in managing stateful systems and data structures for pattern matching, as well as algorithmic and advers...