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."
Solve sliding-window and heap problems
Question Design an algorithm using a sliding window to compute the maximum sum of any contiguous subarray of length k; explain time- and space-complex...
Calculate Conversion Rate from Ad Clicks to Page Visits
user_events | user_id | event_time | event_type | ad_id | |---------|----------------------|------------|-------| | 1 | 2023-01-01 10:...
Determine Maximum Path Length in Directed Acyclic Graph
Scenario A backend service represents task dependencies as a directed graph; you need to understand how deep the longest dependency chain can get. Que...
Find Minimum Path Sum in Integer Triangle
Scenario Tech interview round 1 – dynamic programming challenge Question Given a triangle of integers, find the minimum path sum from top to bottom. A...
Design Algorithm for Longest Substring with K Distinct Characters
Scenario Tech interview round 2 – sliding-window algorithm Question Design an algorithm that finds the length of the longest substring containing at m...
Create SQL Queries for Sales and Customer Analysis
SALES +----------+----------+------------+------------+----------+---------+ | sale_id | store_id | product_id | sale_date | quantity | revenue | +-...
Derive Key Business Metrics Using SQL or Python
Orders +----------+-------------+------------+---------+------------------+ | order_id | customer_id | order_date | amount | product_category | +----...
Compute User Retention and Analyze Event Data
user_events +---------+---------------------+------------+-------+ | user_id | event_time | event_type | page | +---------+-----------------...
Explain MySQL to MS SQL Server query syntax differences.
transactions | id | user_id | amount | txn_date | |----|---------|--------|----------| | 1 | 1001 | 25.00 | 2023-07-01 | | 2 | 1002 | 40.00 ...
Determine Growth of Pirated Theme Installations Over Years
merchants +-------------+------------+ | merchant_id | join_date | +-------------+------------+ | 1 | 2020-01-02 | | 2 | 2020-03-...
Identify Transactions During 'Golden' Membership Period
transaction +-----------+---------+------------+---------+ | trans_id | user_id | trans_date | amount | +-----------+---------+------------+--------...
Analyze Posting Behavior by Cohort and Date
creator_post +------------+---------+------+ | post_date | user_id | post | +------------+---------+------+ | 2023-01-01 | 111 | 1 | | 2023-01...
Calculate Monthly Revenue from Orders in 2023
orders | id | order_date | customer | |----|------------|----------| | 1 | 2023-01-03 | 101 | | 2 | 2023-02-14 | 102 | | 3 | 2023-02-20 | 101 | o...
Calculate Monthly Conversion Rate and Average Order Value
page_views +-----------+---------+---------------------+ | user_id | page_id | view_timestamp | +-----------+---------+---------------------+ |...
Retrieve Top Five Ads by Conversions in 30 Days
ads ad_id | advertiser_id | created_at 1 | 101 | 2024-06-01 2 | 102 | 2024-06-03 3 | 101 | 2024-06-10 ad_i...
Recommend two-hop follows in Python
Given a directed "follows" graph as a Python dict[str, list[str]], implement recommend_two_hop(graph, user) that returns the set (or a sorted list) of...
Write SQL for active follow connections
Table: follow_events(requester_id INT, target_id INT, event STRING CHECK (event IN ('request_follow','follow_success','follow_reject','unfollow')), ev...
Count changed nodes in N-ary trees
Question Given two N-ary trees (old and new versions) where each node has a key (string), value (int), and list of children, compute how many nodes ar...
Find most frequent log user
Question You are given a list of log entries in string format, where each entry contains a username and an access timestamp separated by a delimiter (...
Find largest island area
Question Given a 2D grid of 0s and 1s, find the largest area of a connected group of 1s (island) using 4-directional adjacency; return that area. (Var...