Data Scientist Coding & Algorithms Interview Questions
Practice 335 real Coding & Algorithms interview questions for Data Scientist roles. From companies including Amazon, Google, Two Sigma, Pinterest, Uber.
"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 sampling, subarray scan, and percentile estimate
This multi-part problem evaluates skills in random sampling and geometric probability for uniform 2D sampling, algorithmic array processing for findin...
Move zeros to the front
This question evaluates array manipulation and in-place algorithm competencies, including handling space-time trade-offs and preserving relative order...
Compute bus-on-time and dice-sum probabilities
This question evaluates understanding of probability concepts including a continuous uniform waiting-time model for bus arrivals and discrete outcome ...
Return sorted values after quadratic transform
This question evaluates understanding of mathematical transformations and array manipulation, specifically how applying a quadratic function affects t...
Increment Digit Array
This question evaluates a candidate's competency in array manipulation and elementary arithmetic on digit sequences, including carry propagation and h...
Implement composition and mixin utilities
This question evaluates functional programming concepts (function composition and variable-argument handling) and object-oriented serialization patter...
Count Closed Islands
This question evaluates a candidate's understanding of grid-based connectivity and the ability to detect enclosed regions, testing skills in graph rep...
Linear Interpolator with Extrapolation
Linear Interpolator with Extrapolation You are given n knot points in a 2D coordinate system, where knots[i] = [x_i, y_i]. All x-coordinates are disti...
Determine earliest collision among moving cars
You are given n cars moving over time. Each car has known initial state at time \(t=0\): - 1D case (straight road): - initial position \(x_i\) (mete...
Implement nested template string substitution
This question evaluates understanding of string processing, dependency resolution, recursive expansion, cycle detection, and efficiency techniques suc...
Maximize watched duration under consecutive-sum limit
You have a list of videos in a feed. Video i has duration d[i] (positive integer). A user has an “attention span” limit A. You want to select a subset...
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...
Solve sliding window, graph top-k, and greedy tasks
You have three coding tasks. Task 1 — Sliding window on strings: Given a string s and an integer k, find one longest substring of s that contains at m...
Optimize Travel Costs and Generate Rotational Symmetric Numbers
Scenario You are building a travel-search engine that must 1) show customers the cheapest round-trip they can book if departure and return prices vary...
Count Word Frequency and Print Top Three Words
Scenario First-round Python coding screening Question Using only basic Python, write a function that receives a list of strings and returns a dictiona...
Design Data Structure for Sparse Matrices Operations
Scenario Analytics engine stores extremely sparse numeric matrices. Question Design a data structure to store two sparse matrices and implement print(...
Determine Pin Connections Through Common Boards
Scenario Pinterest boards contain many pins; need to infer relationships between pins. Question Given the membership lists of all boards, write a func...
Design Algorithm to Minimize Payments in Expense-Sharing App
Scenario Expense-sharing app needs to settle debts among friends after a trip. Question Given a list of transactions (payer, payee, amount), design an...
Optimize Station Sequence for Maximum Car Output in Simulation
Scenario The Car-Building mini-game lets you sequence chassis, engine, and paint stations with limited buffers. Question Describe a strategy to maximi...
Compute maximum non-overlapping meetings
Assume you are given a list of meeting time intervals for a single person. Each meeting i is represented by a pair of integers [start_i, end_i], where...