Interview Questions
Practice the exact questions companies are asking right now.
"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."
Delete One Character Type to Minimize Unique Segments
Problem Implement min_unique_segments_after_deletion(s) for a nonempty lowercase English string. Choose exactly one character value that appears in s ...
Generate Every Ordered Sum Using Ones and Twos
Generate every ordered string of ones and twos whose digit values sum to a target integer, with no duplicates and lexicographic output. The problem te...
Count Pairs of Strings with Disjoint Character Sets
Count Pairs of Strings with Disjoint Character Sets Problem Implement countDisjointStringPairs(words) -> count. Count unordered index pairs (i, j) wit...
Debug Feature Updates in a Laptop Management CLI
Debug Feature Updates in a Laptop Management CLI You are debugging a command-line laptop management system. Each laptop belongs to one or more users a...
Implement a Time-Aware Banking System
Implement a Time-Aware Banking System Design an in-memory banking component in four increments. It must create accounts, accept deposits, transfer fun...
Validate a Balanced INDENT and DEDENT Token Stream
Validate a Balanced INDENT and DEDENT Token Stream Problem A tokenizer has already converted a document into a sequence of tokens. Two token values ha...
Design Permission-Aware Retrieval for Design Files
Design Permission-Aware Retrieval for Design Files Design a search system for a design-editing agent. Users and agents issue short queries, typically ...
Prevent Duplicate Payments Under High Load
This system design question tests a candidate's ability to reason about idempotency, distributed consistency, and fault tolerance in high-throughput p...
Design a Superhero Dispatch System
Design the backend for a superhero rescue marketplace — a dispatch platform that connects civilians in distress with nearby superheroes. Civilians rep...
Implement a Merkle Tree for Repository Contents
Implement a Merkle tree over the contents of a cloned repository. The tree should let a client and server compare repository state efficiently by exch...
Build a Self-Service Market Data Discovery and Support Layer
Build a Self-Service Market Data Discovery and Support Layer An analyst asks where to find Bloomberg company identifiers and the associated figures ne...
Design Direct File Uploads for a Chat Application
Design Direct File Uploads for a Chat Application Design file uploads for an existing chat application. Clients should upload file bytes directly to a...
Evaluate Dependent Variable Assignments
Evaluate Dependent Variable Assignments Problem Implement evaluate_assignments(expressions). Each input string assigns one variable to a sum of intege...
Find Each User's Earliest Seven-Day Activity Streak
Find Each User's Earliest Seven-Day Activity Streak Write one PostgreSQL SELECT statement or CTE query. Do not create, alter, or modify tables. Schema...
Implement a Consistent Hash Ring
Implement a Consistent Hash Ring Design a consistent-hashing component that maps arbitrary keys to backend nodes and minimizes remapping when nodes ar...
Design a Threshold-Based Database Partition Rebalancer
Design a Threshold-Based Database Partition Rebalancer You are given database partitions and a size threshold. Oversized partitions should be split in...
Design a Prompt Sharing Product
Design a Prompt Sharing Product The source separately reports a product-design interview about prompt sharing, including user flow, database schema, s...
Prevent Vanishing Gradients in Deep Networks
Prevent Vanishing Gradients in Deep Networks Clarifying Questions to Ask - Are we discussing feed-forward networks, recurrent networks, or both? - Sho...
Find the Most Frequently Used Meeting Room
Find the Most Frequently Used Meeting Room Problem Implement mostBookedRoom(roomCount, meetings) -> roomId. Rooms are numbered 0 through roomCount - 1...
Find the Lowest Common Ancestor in a Binary Tree
Find the Lowest Common Ancestor in a Binary Tree Problem Implement lowestCommonAncestor(left, right, root, first, second) -> nodeId. The binary tree h...