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."
Implement three interview-style coding tasks
You are given three separate coding tasks, all focused on algorithm and data-structure design. --- Task 1: Longest Bounded-Difference Subarray You are...
Determine if subarray sums to target
You are given an array of non-negative integers and a non-negative integer target. Determine whether there exists a contiguous subarray (continuous se...
Find single element when others repeat k times
You are given a sorted array of integers nums in non-decreasing order, and an integer k ≥ 2. Every value in nums appears exactly k times in a row, exc...
Compute subarray span for each element
You are given an integer array nums of length n. For each index i (0 <= i < n), define ans[i] as the maximum possible length of a contiguous subarray ...
Design an in-memory database with TTL and backups
You are asked to implement a small in-memory “database” that evolves across 4 parts. In each part you may reuse your previous code and only add/extend...
Find longest common ordered restaurant list
You have two delivery drivers who each have a pickup plan represented as a list of restaurant IDs (strings). Because there is only one car, the combin...
Bottom-Insertion Connect Game: Detect the First k-in-a-Row Winner
Two players, B and R, take turns dropping pieces onto a board that covers the upper half-plane of an integer grid. Columns are indexed by arbitrary in...
How would you sort filenames with numeric segments?
You are given a list of filename strings (e.g., "file10.txt", "file2.txt", "10file.txt"). Implement a custom sort for these strings using a comparator...
Find shortest path in a Fibonacci-ordered tree
You are given a recursively-defined binary tree T(order) whose shape depends only on order (not on node values). Nodes are labeled 0..N-1 using preord...
Implement an LRU cache
Design and implement an in-memory cache that evicts entries using the Least Recently Used (LRU) policy. The cache should store key–value pairs and sup...
Determine whether points form squares
Problem: Square detection and counting from point coordinates You are given points on a 2D plane with integer coordinates. Part A — Validate a single ...
Compute servers needed for daily recurring jobs
You operate a cluster of identical servers that run recurring daily jobs. For a single day, you are given a list of job execution intervals. Each inte...
Minimize calls to find all bad test pairs
You have \(n\) atomic tests \(t_1, t_2, \dots, t_n\). You are given access to a black-box function: `python bool runTest(set<Test> S) ` which behaves ...
Find shared objects across two log files
You are given two large log files representing activity on two different days. Each line of each log has three fields: - timestamp: a time value (you ...
Implement a per-user API rate limiter
You are building an API gateway that must enforce per-user rate limits. Task Implement a rate limiter with the following API: - RateLimiter(int maxReq...
Find shortest substring with n unique letters
Problem You are given a string s consisting of lowercase English letters and an integer n (1 ≤ n ≤ 26). Find the length of the shortest contiguous sub...
Find K-th Largest and Longest Vacation
Solve the following two coding problems. 1. Find the k-th largest element Given an integer array nums and an integer k, return the element that wou...
Find k pairs with smallest sums
You are given two sorted integer arrays arr1 and arr2 (each sorted in non-decreasing order), and an integer k. Consider all possible pairs formed by t...
Find right-side view of binary tree
You are given the root of a binary tree. From the right side of the tree, at each depth you can see exactly one node: the rightmost node at that depth...
Implement nested object path lookup
This question evaluates parsing and traversal of nested maps and arrays, robust error handling for missing keys and out-of-bounds indices, and reasoni...