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"
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"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."
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"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."
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"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."
Maximize 1D deliveries within distance and minimize total distance
You are given positions on a 1D line: - people: an array of N integers (positions of people) - shops: an array of M integers (positions of milk-tea sh...
Compute final prices with next smaller discount
You are given an integer array prices of length n, where prices[i] is the original price of the i-th item. For each item i, find the first index j > i...
Merge intervals and design rating APIs
Problem 1: Merge overlapping intervals You are given a list of closed intervals intervals, where intervals[i] = [start_i, end_i] and start_i <= end_i....
Implement sequential and parallel URL requests
You are given a list of URL strings. For each URL, send an HTTP GET request and return the responses. Output format Return a list of objects: - url: t...
Solve scheduling and tree path problems
You are given three separate coding problems (asked across two rounds). For each, write a function that returns the required output. Problem 1: Max cr...
Implement array rotations and CSV keyword search
Problem A — Rotate an array left/right by k You are given an integer array nums of length n and an integer k. 1. Implement rotateLeft(nums, k) that re...
Format text into fixed-width justified lines
You are given an array of strings words (each string is a word with no spaces) and an integer maxWidth. Return a list of lines (strings) that formats ...
Solve Grid Path and Unique Substring
You are given two independent coding problems. For each problem, provide an implementation and analyze the time and space complexity. Problem 1: Find ...
Implement a persistent sharded key-value store
Problem Implement a simple key–value store that persists data on disk. You must store the data in fixed-size shards, where each shard is saved in one ...
Choose container set to minimize waste
Question A pharmaceutical company is packaging liquid medicine for shipment. Each customer order has a required volume. The company can choose exactly...
Solve two interview coding problems
This interview included two coding tasks: 1. Currency conversion graph You are given a set of directed currency exchange rates, for example: - C...
Find minimum tanks to cover all houses
You are given a string S representing a street: - 'H' = a house - '-' = an empty plot where you may place a water tank A house is considered covered (...
Implement feedback for word guessing game
You are implementing the core logic for a simple word-guessing game. There is: - A dictionary of valid words: a list of distinct lowercase strings, al...
Design a bank with scheduled payments and merges
Design an in-memory banking service that supports the following operations: ( 1) CreateAccount(accountId), ( 2) Deposit(accountId, amount), ( 3) Trans...
Determine equality of arbitrarily nested sets
Implement a function that determines whether two arbitrarily nested sets are equal. Sets are unordered and contain no duplicates; elements can be inte...
Select next Hangman letter
Given the current state of a Hangman game, implement a function that selects the next letter with the highest likelihood of appearing in the secret wo...
Find Earliest Fully Connected Time
You are given n people labeled 0 to n - 1 and a list of friendship logs. Each log has the form (timestamp, personA, personB, action), where action is ...
Populate next pointers in a perfect binary tree
You are given a perfect binary tree (all leaves at the same level; every internal node has two children). Each node has fields left, right, and next. ...
Solve maze reachability and two follow-ups
You are given three independent coding tasks. 1) Maze reachability with “rolling ball” movement Given an m x n grid maze where 0 means empty and 1 mea...
Design a snapshotable key-value store
Design and implement a snapshotable key–value map supporting the following APIs: - S(key, value): set the current value of a string key to a string va...