xAI Coding & Algorithms 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."
Maximize distinct values after unique ± offsets
This question evaluates combinatorial reasoning and algorithmic optimization skills, focusing on transforming arrays under distinct integer-offset con...
Define and compare smart pointers
What is a smart pointer? How do smart pointers manage ownership and lifetimes compared with raw pointers? Describe common types (unique, shared, weak)...
Contrast processes and threads
What are the differences between processes and threads? Compare memory isolation, resource ownership, scheduling, context-switch cost, inter-process c...
Explain arrays and memory layout
What is an array? How is an array represented in memory (contiguous layout, element size and alignment, indexing arithmetic). Analyze time complexitie...
Find kth element and sliding-window kth in stream
This question evaluates understanding of order statistics and selection in arrays as well as sliding-window stream processing, including maintaining k...
Implement an in-memory database with TTL and backup
In-Memory Database (Levels 1–4: TTL and Backup/Restore) Implement an in-memory database that stores records identified by a string key. Each record co...
Compute total active time per Twitter Space
This question evaluates a candidate's ability to perform event-log sessionization and time-interval aggregation across users and spaces, testing skill...
Implement a Radix Cache for Integer Sequences
Implement a RadixCache — a radix tree (prefix-compressed trie) that stores sequences of integers. In a plain trie, every node holds exactly one elemen...
Implement a parallelized sort
This question evaluates understanding of parallel algorithms, shared-memory concurrency primitives, synchronization, workload partitioning, and perfor...
Weighted LRU Cache: Capacity Counted by Item Quantity
Design a variant of the classic least-recently-used (LRU) cache. In the classic version, the capacity limits the number of items stored. In this varia...
Sort a Large Array Using Multiple Threads
Sort a Large Array Using Multiple Threads You are given a large array of integers nums and a thread count k. Sort the array in ascending order using m...
Implement dynamic batching for token decoding
You are given a black-box “simulated language model” interface that can advance many sequences in a batch. Model interface - Tokens are integers. - mo...
Identify all bad nodes with group tests
You have N nodes. Each node is either good or bad (unknown to you). You can call a function test(S) on a subset of nodes S: - test(S) = True iff all n...
Design a Least Frequently Used (LFU) Cache with O(1) Operations
Design and implement a data structure for a least frequently used (LFU) cache. Implement a class LFUCache with the following operations: - LFUCache(in...
Minimum Time to Run All Jobs with a Cooldown Between Identical Jobs
You are given a list of jobs to run on a single-core CPU, where each job is represented by an uppercase letter 'A'–'Z' in an array jobs. Jobs of the s...
Design a Fixed-Capacity Least-Recently-Used Cache
Design a Fixed-Capacity Least-Recently-Used Cache Design and implement a cache with a fixed maximum capacity that evicts the least recently used entry...
In-Memory Key-Value Database with Nested Transactions
In-Memory Key-Value Database with Nested Transactions Implement an in-memory key-value database that processes a sequence of commands and supports nes...
Constant-Time Insert, Remove, and Uniform Random Sampling
A data-sampling service maintains a dynamically changing pool of integer example IDs. Examples are continuously added and retired, and the service mus...
Greedy Longest-Match Tokenizer for an LLM Data Pipeline
You are building a text pre-processing step for a large-language-model training pipeline. Before raw text can be fed into the model, it must be split ...
Flatten and unflatten nested Python structures
This question evaluates proficiency in manipulating nested data structures, deterministic traversal and mapping between hierarchical shapes and flat i...