Software Engineer Coding & Algorithms Interview Questions
Practice 2,712 real Coding & Algorithms interview questions for Software Engineer roles. From companies including Meta, Amazon, Google, Uber, Microsoft.
"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."
Compute Top-K word frequencies under a path
Compute Top-K word frequencies under a path Given a filesystem path that may contain nested subdirectories and files, compute the top K most frequent ...
Sort Three Categories In Place
You are given an array items containing only the values 0, 1, and 2, where each value represents a category. Rearrange the array in-place so that all ...
Compute Earliest Bus Arrival
This question evaluates proficiency with shortest-path algorithms and time-dependent graph modeling, focusing on reasoning about travel times combined...
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...
Process auth requests with fraud rules
Question Implement a function that, given a list of Authorization Requests (timestamp_seconds, unique_id, amount, card_number, merchant), outputs a hu...
Retain Top K Elements
Given a list of integers nums and an integer k, return a new list formed from the original list after removing every element except the k largest elem...
Implement an In-Memory File Storage System
Implement an in-memory file storage service. You need to support files identified by a unique full path string, such as "/docs/a.txt". Each file has a...
Implement Random Connectivity and Grid Routing
This entry contains two independent coding problems. Problem 1: Uniformly connect node groups You are given k non-empty, disjoint groups of unique nod...
Determine Whether Queries Can Zero Array
This question evaluates competency in array manipulation, range updates, and feasibility under constraints, focusing on reasoning about sequential int...
Design a Balloon Festival Simulator
Implement a class BalloonFestival with the following API and rules. Goal Track hot air balloons (yours and competitors), evolving wind fields, and bal...
Simulate document assignment to indexers
You are given a system with m parallel indexers (workers), numbered from 0 to m-1. Documents arrive over time and are placed in a processing queue. Ea...
Design order stream with state transitions
Design order stream with state transitions Implement an in-memory order stream service with operations: add(order), delete(order_id), pause(order_id),...
Group Duplicate Files by Content
Group Duplicate Files by Content Given a snapshot of files, return groups of paths whose complete contents are identical. The interview report preserv...
Solve String Addition and Expression Evaluation
This question evaluates string manipulation and parsing skills for numeric computation, covering addition of integers represented as character arrays ...
Implement a sliding-window rate limiter
Implement an in-memory sliding-window rate limiter. You are given a stream of requests, each with a timestamp in milliseconds. Part 1: Per-user limit ...
Determine Whether a Binary Tree Is a Valid BST
Determine Whether a Binary Tree Is a Valid BST Problem Given a binary tree, determine whether the entire tree satisfies the strict binary-search-tree ...
Solve Subarray Sum and Local Minimum
Two coding problems were reported in the same phone-screen round: 1. Count target-sum subarrays. Given an integer array nums and an integer k, return ...
Highlight Exact Source Matches
You are given a string text and a list of strings sources. For every exact occurrence of any string in sources within text, wrap the matched character...
Serialize and deserialize a binary tree
This question evaluates competency in designing robust serialization formats and manipulating binary tree data structures, including preservation of s...
Return a topological ordering of a graph
This question evaluates understanding of graph algorithms—particularly topological sorting and cycle detection—and competency in ordering dependencies...