Software Engineer Coding & Algorithms Interview Questions
Practice 2,306 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."
Solve vertical order & diameter variants
Question LeetCode 314. Binary Tree Vertical Order Traversal LeetCode 543. Diameter of Binary Tree – modified to return the number of nodes (edges + 1)...
Determine blockage and parse HTML tokens
Question Given a set of 2-D circular stones, determine whether they can completely block the width of a river. You may define the input format. Given ...
Compute sliding window sums by tag
Question Given a list of datapoints where each datapoint has tags, a timestamp, and a value, write a function that, for a specified tag t and window s...
Implement tree ops and LRU cache
Question Implement set(index) and clear(index) for the leaves of a full binary tree initially filled with 0s, where a parent node becomes 1 only when ...
Implement string-path file system operations
Question LeetCode 1166. Design File System – extended to support Create(path, value), Get(path), Set(path, value) and Delete(path) with validation rul...
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...
Deduplicate a Linked List
Given a singly linked list, remove duplicate values in-place. Variant A (sorted list): delete repeated nodes so each value appears once using O( 1) ex...
Explain Java DI, AOP, and transactions
Explain how dependency injection and AOP proxies are implemented in a modern Java framework such as Spring: bean lifecycle (creation, post-processing,...
Implement Markdown-to-HTML parser
Implement a function that converts a plain-text string into HTML supporting only these features: ( 1) Paragraphs: two or more consecutive newline char...
Design a key-value store with getLast
Design and implement an in-memory key–value store with this API: add(key, value), get(key), remove(key), and getLast(). The operation getLast() must r...
Implement weighted random index picker
Design a class WeightedPicker that is initialized with an array of positive integer weights w and supports pick() that returns an index i with probabi...
Content Safety Filter
Content Safety Filter You are building a content-safety component for a messaging platform. The system receives a stream of chat messages and must dro...
Moderator System with Ranking, Communities, and Demotion
You are designing a system that tracks moderator privileges for an online community using a time-ordered log of moderation actions. Each log record ca...
Character Frequency Count in a String
Character Frequency Count in a String Given a string s, count how many times each character occurs in it and return the per-character frequencies. Pro...
Longest Substring Without Repeating Characters
Longest Substring Without Repeating Characters Given a string s, find the length of the longest substring that contains no repeating characters. A sub...
In-Memory File System: Create, Track Duplicates, and List
In-Memory File System: Create, Track Duplicates, and List Implement an in-memory file system that supports creating files and folders and listing the ...
Minimize Cost for Feature-Capable Models
You are given n machine learning models. Model i has a positive integer cost cost[i] and a two-character binary string featureAvailability[i] describi...
Maximum Sum Skyline
Maximum Sum Skyline You are laying out a row of n decorative pillars along a straight walkway. The pillars are numbered 0 through n - 1 from left to r...
Implement a JSON Parser
Implement a JSON Parser Write a parser that takes a single string containing one JSON value and returns the corresponding in-memory data structure. Yo...
Course Prerequisite Feasibility
Course Prerequisite Feasibility You are given an integer n representing the number of courses, labeled from 0 to n - 1. You are also given a list prer...