Software Engineer Coding & Algorithms Interview Questions
Practice 2,743 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."
Validate a 9×9 grid under constraints
This question evaluates the ability to perform constraint validation on a fixed-size 9×9 grid, testing skills in matrix/array handling, duplicate dete...
Implement wildcard querySelector to extract URL
This question evaluates implementation skills for a simplified selector engine, DOM traversal and manipulation, wildcard attribute pattern matching, a...
Compute dot product of sparse vectors
This question evaluates proficiency with sparse data representations and algorithmic efficiency by requiring the dot product to be computed from lists...
Generate all permutations of an array
This question evaluates understanding of permutation generation, recursion and backtracking techniques, along with skills in state-space exploration a...
Implement a Maximum-Tracking Stack
Design a stack-like data structure that supports the following operations efficiently: - push(x): Push integer x onto the stack. - pop(): Remove and r...
Count paths with prime-ending jumps
You are given an integer n representing the top of a staircase, where you start at step 0 and want to land exactly on step n. In one move, you may jum...
Detect Trigger and Resolve Events
You are given transaction logs sorted by non-decreasing timestamp. Each log record has four fields: - timestamp: integer time in seconds - merchant_id...
Count unique Morse-code word transformations
Given an array of lowercase strings words. Each letter 'a' to 'z' has a corresponding Morse code string (standard 26-letter mapping). A word’s transfo...
Find conflicting pair using black-box run()
This question evaluates algorithm design and query-complexity reasoning, focusing on efficient search strategies for identifying an interacting pair v...
Find best-matching binary pattern with wildcards
This question evaluates pattern-matching and string-algorithm skills, including handling wildcards and variable-length matches, priority-based rule se...
Select the best dasher for an order
You need to assign an order to a dasher. Input: - An order with a pickup location (x, y). - A list of dashers, each with: - id - current location ...
Decode Ambiguous Morse Messages
You are given a mapping from Morse patterns to lowercase English letters. Implement two related functions: 1. Deterministic decoding with character an...
Count substrings and generate TOC
Solve the following two coding problems. 1. Count valid binary substrings Given a string s consisting only of '0' and '1', count how many substrings s...
Can two names match with ≤2 swaps?
You are given two restaurant names represented as strings s and t of equal length (same character set, case-sensitive). In one operation, you may swap...
Find top/bottom-k words in list or stream
You are given words (strings) either as a finite list or as an unbounded stream. 1) List version: Given an array words and an integer k, return: - the...
Return sorted squares of a sorted array
This question evaluates array-processing and algorithmic optimization skills, including handling negative values, element-wise transformations, and pr...
Find max node-value range across components
This question evaluates understanding of undirected graph connectivity and component-wise aggregation, specifically the ability to identify connected ...
Calculate Courier Earnings
Design a function to calculate total courier pay from a set of delivery orders. Assume time is represented as integer minutes, and intervals are half-...
Compute distance of each node to a cycle
This question evaluates proficiency in graph algorithms, including understanding unicyclic graph structure, cycle identification, and computing minimu...
Compute meeting rooms and evaluate RPN
This multi-part question evaluates interval reasoning and resource-allocation skills for meeting room scheduling alongside stack-based expression eval...