Software Engineer Coding & Algorithms Interview Questions
Practice 2,295 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."
Design robot path boundedness with repeats
You are given a 2D grid with a set of blocked cells (obstacles) and a robot starting at (0, 0) facing north. The robot executes a finite instruction s...
Calculate Circular Route Query Distance
You are given a circular route with n stops numbered 0 to n - 1. The array distances has length n, where distances[i] is the clockwise distance from s...
Merge Sorted Arrays
You are given two related tasks about sorted integer arrays. 1. Implement a function that takes two arrays sorted in nondecreasing order and returns a...
Compute ring window max and deletion indices
Part A — Ring window maximum: You are given n computers arranged in a circle, represented by an array of bits (1 = on, 0 = off), and an integer k (1 <...
Implement a thread-safe rate limiter
Design and implement a per-user API rate limiter. Requirements: - Method: boolean allow(String userId, long nowMillis) returns whether the request is ...
Implement Wordle-style word guessing solver
Implement a program to solve a Wordle-style word guessing game. The game has a hidden target word of fixed length L (e.g., 5) drawn from a known dicti...
Check if all substrings are anagrams of words
You are given a string s (letters only) and access to an English dictionary dict (a set of valid words). Return true if every contiguous substring of ...
Implement list and grid transformation tasks
You are given three independent coding tasks (as in an online assessment). Implement each as a separate function. 1) Uppercase–lowercase difference In...
Rotate a 3×3 digit grid by 180°
Problem You are given a 3×3 grid of digits (characters '0'–'9'), represented as an array of 3 strings of length 3. When the entire grid is rotated by ...
Maximize sum without choosing adjacent elements
Problem You are given an integer array nums where nums[i] is the value in position i. Select a subset of indices such that no two selected indices are...
Implement price-based order matcher
Design and implement a price-based order matcher for unit-sized orders. You are given an array orders where each element is [type, price]: type = 1 de...
Implement toy-language types and generic substitution
Problem: Toy Language Type System (Printing + Generic Resolution) You are implementing a small type system for a custom “Toy Language”. Types can be: ...
Find Top Hashtags
You are given two arrays of length n: - tweets[i]: the content of the i-th tweet as a string - timestamps[i]: the publish time of the i-th tweet as an...
Implement Kac ring with O(1) color and kstep
You are implementing a Kac ring dynamical system. Model - There are N positions arranged in a circle, indexed clockwise: 0, 1, ..., N-1. - Each positi...
Solve meeting and tree problems
The interview included two coding tasks: 1. Merge meeting intervals You are given a list of meeting intervals [[start, end], ...], not necessarily ...
Build a concurrent web crawler
Implement a web crawler that starts from a given URL and visits every reachable page on the same host. You are given: - start_url: a string representi...
Implement an in-memory SQL-like table
Problem Implement a simple in-memory database for one table. All values are strings. Each row is identified by a rowKey (string). Each row contains co...
Compute shortest path in cyclic graph
Problem: Shortest Path in a Graph With Cycles You are given a directed weighted graph that may contain cycles. - There are n nodes labeled 0..n-1. - Y...
Return dictionary words matching a prefix
You are given a list of strings words (a dictionary) and a string prefix. Return all words in words that start with prefix. Clarifications/constraints...
Determine if a 14-tile hand is winning
You are given an integer array tiles of length 14 representing a Mahjong-like hand. Each integer is a tile value from 1 to 9 (single suit). You may re...