Interview Questions
Practice the exact questions companies are asking right now.
Questions
9.8k
Companies
511
Updated
08.16.2026
9.8k Questions 511 Companies08.16.2026
PLTCHK
"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"
_The_TaNk_
"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"
ChrisSenior SWE, LinkedIn
"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."
sleepy33
"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."
JakeSenior ML Engineer, Lyft
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
nuggetlord
"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."
CarlosFull Stack, Shopify
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
boba.tea.vibes
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
AndySWE-II, Google
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
couchpotato99
"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."
ShrutiData Engineer, Salesforce
"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."
midnightramen
"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."
BiancaFrontend Eng, Figma
"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."
tambrahm007
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
toa
"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."
Showing 20 results
Role
Medium
Software EngineerFind lowest common ancestor in tree
You are given the root of a binary search tree (BST) and two distinct nodes p and q that are guaranteed to exist in the tree. Task (BST case): - Find ...
Coding & Algorithms
6
0
56 people solved
Nov 19, 2025
Medium
Software EngineerInternSolve tree diameter and grid path problems
You are interviewing for a software engineer / ML intern role and are given the following algorithmic problems. --- Question 1: Longest Path in a Tree...
Coding & Algorithms
2
0
38 people solved
Nov 18, 2025
Medium
Machine Learning EngineerDesign LFU cache with distributed extension
Problem You are asked to design and implement a data structure that behaves like an in-memory cache with a Least Frequently Used (LFU) eviction policy...
Coding & Algorithms
4
0
35 people solved
Nov 18, 2025
Medium
Software EngineerCount integer pairs satisfying 1/x + 1/y = 1/N
You are given a positive integer N (\(1 \le N \le 10^6\)). Consider the Diophantine equation: \[ \frac{1}{x} + \frac{1}{y} = \frac{1}{N}, \] where x a...
Coding & Algorithms
6
0
56 people solved
Nov 17, 2025
Hard
Software EngineerMaximize stock profit with one or two trades
You are given an array prices where prices[i] is the price of a given stock on day i (0-indexed). You want to maximize your profit by choosing when to...
Coding & Algorithms
5
0
82 people solved
Nov 17, 2025
Easy
Data EngineerImplement most_frequent_key without using max()
Problem (Python OOP) You are given two classes. Parent precomputes frequency counts of items (as strings) from an input list. `python class Parent: ...
Coding & Algorithms
10
0
88 people solved
Nov 16, 2025
Hard
Data ScientistInternImplement Univariate Linear Regression with Ordinary Least Squares
Implement univariate (simple) linear regression fitted in batch with the ordinary least squares (OLS) closed-form solution. You must implement the for...
Coding & Algorithms
0
0
4 people solved
Nov 15, 2025
Hard
Data ScientistInternMaximum-Product Simple Path in a Complete Directed Graph
You are given a complete directed graph with n nodes labeled 0 through n - 1. For every ordered pair of distinct nodes (i, j), there is a directed edg...
Coding & Algorithms
0
0
5 people solved
Nov 15, 2025
Hard
Data ScientistInternCount Distinct Island Shapes in a Binary Grid
You are given an m x n binary grid grid, where grid[i][j] is either 0 (water) or 1 (land). An island is a maximal group of 1-cells connected 4-directi...
Coding & Algorithms
0
0
7 people solved
Nov 15, 2025
Medium
Software EngineerCompute last-5-minute QPS in memory
Problem You are building a lightweight in-memory component that tracks the query load (QPS) of a service. Design a data structure with two operations:...
Coding & Algorithms
5
0
97 people solved
Nov 14, 2025
Easy
Software EngineerInternDiscuss overfitting, contrastive learning, transformers
You are interviewing for an applied scientist role and are asked several theory questions. 1. Overfitting - Define overfitting and underfitting in ...
Machine Learning
4
0
41 people solved
Nov 14, 2025
Medium
Software EngineerFind longest subsequence of x that is a substring of y
Given two strings x and y, compute the maximum length of a string s such that: - s is a subsequence of x (can delete zero or more characters from x wi...
Coding & Algorithms
24
1
178 people solved
Nov 13, 2025
Medium
Data ScientistFind top-paid employee per department
Given the following tables: 1) employees - employee_id INT PRIMARY KEY - employee_name VARCHAR 2) employee_department - employee_id INT - department_i...
Data Manipulation (SQL/Python)
4
0
39 people solved
Nov 12, 2025
Easy
Software EngineerDesign a time-versioned key-value store and find common free time
You are given two coding tasks. Task 1: Time-versioned key-value store Design an in-memory data structure that supports: - set(key, value, timestamp):...
Coding & Algorithms
4
0
32 people solved
Nov 12, 2025
Medium
Machine Learning EngineerRotate a Matrix In Place
Given an n x n matrix of integers, rotate the matrix 90 degrees clockwise. Implement the function in Python. You may use a straightforward approach wi...
Coding & Algorithms
0
0
8 people solved
Nov 11, 2025
Hard
Software EngineerImplement three interview-style coding tasks
You are given three separate coding tasks, all focused on algorithm and data-structure design. --- Task 1: Longest Bounded-Difference Subarray You are...
Coding & Algorithms
15
0
132 people solved
Nov 11, 2025
Medium
Software EngineerDetermine if subarray sums to target
You are given an array of non-negative integers and a non-negative integer target. Determine whether there exists a contiguous subarray (continuous se...
Coding & Algorithms
7
0
59 people solved
Nov 11, 2025
Hard
Software EngineerFind single element when others repeat k times
You are given a sorted array of integers nums in non-decreasing order, and an integer k ≥ 2. Every value in nums appears exactly k times in a row, exc...
Coding & Algorithms
6
0
49 people solved
Nov 9, 2025
Hard
Software EngineerCompute subarray span for each element
You are given an integer array nums of length n. For each index i (0 <= i < n), define ans[i] as the maximum possible length of a contiguous subarray ...
Coding & Algorithms
6
0
57 people solved
Nov 9, 2025
Medium
Software EngineerDesign an in-memory database with TTL and backups
You are asked to implement a small in-memory “database” that evolves across 4 parts. In each part you may reuse your previous code and only add/extend...
Coding & Algorithms
32
0
288 people solved
Nov 8, 2025