Coding & Algorithms Interview Questions
Practice 3,469 real Coding & Algorithms interview questions for 2026. Covers companies like Meta, Amazon, Google, Uber, and Microsoft. Real questions from actual interviews with detailed solutions — ideal for focused interview preparation. Coding & Algorithms interview questions are the single most common technical gate for software engineering roles and are used to evaluate problem framing, algorithm selection, complexity trade-offs, correctness, edge-case reasoning, and clear communication under time pressure. Expect this category to appear in early technical screens and repeatedly across onsite loops at companies that weight it heavily (notably Meta, Google, and Amazon). Interviews will test arrays and strings, trees and graphs, dynamic programming, hashing and two‑pointer techniques, and the candidate’s ability to test and optimize code in a shared editor. Prepare with timed mock interviews, practice in the same editor you’ll use live, and build a progressive schedule that moves from fundamentals to medium/hard problems; typical candidates invest several weeks to a few months of focused practice depending on seniority and target company.
"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."
Explain C++ vector, unordered_map, and virtual functions
Explain C++ vector, unordered_map, and virtual functions In C++, explain: - The amortized and worst-case time complexity of vector::push_back, and how...
Find the Minimum in a Rotated Sorted Array
Find the Minimum in a Rotated Sorted Array A strictly increasing array of distinct integers has been rotated at an unknown pivot. Return its minimum v...
Maximum Profit with Unlimited Stock Transactions
Maximum Profit with Unlimited Stock Transactions Given daily stock prices, compute the maximum profit from any number of buy-and-sell transactions. Yo...
Implement a simple service with tests
Implement a simple service with tests You're given a short written specification for a small service class (no external dependencies). Implement the c...
Count distinct palindromic subsequences
Given a string s consisting of lowercase English letters, compute how many distinct palindromic subsequence strings of lengths 2, 3, and 4 can be form...
Determine if chasing points will meet
You are given N points in 2D, indexed 0..N-1, forming a cycle. - At time t = 0, point i is at coordinates (xi, yi). - All points move simultaneously a...
Determine Safe Bomb Defusal
This question evaluates competency in graph traversal, state-space search, reachability analysis, and handling safety constraints within finite state ...
Implement Byte Formatting and Cafeteria Billing
This question evaluates precision in numeric formatting and unit conversion for byte sizes, along with stateful simulation of capacity-constrained eve...
Find Final Ball Holder
This question evaluates understanding of functional graphs, cycle detection, and handling large-step transitions in deterministic mappings where repea...
Implement Plus One
This question evaluates proficiency in array manipulation, elementary arithmetic operations such as carry propagation, and careful handling of edge ca...
Find the Best Commute Mode
This question evaluates competency in grid-based pathfinding, graph traversal, and multi-criteria optimization of path time and cost within the Coding...
Debug a driver assignment bug
Given a service that selects the best delivery driver ("dasher") for an order, users report incorrect assignments. With a provided codebase and failin...
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 PyTorch training loop
Implement a basic PyTorch training loop You are given a PyTorch neural network model, a DataLoader that yields (inputs, targets) batches, an optimizer...
Return Top K Relevant Apps
This question evaluates algorithmic problem-solving around aggregation and ranking, testing skills in computing aggregated relevance scores, determini...
How do you escape the circle?
A dog runs continuously along the boundary of a circle of radius 1 at speed 4. You start at an arbitrary point strictly inside the circle and can run ...
Implement LRU and LFU caches
Implement two in-memory cache classes with fixed capacity: 1. Recent-use cache - get(key): return the value for key, or -1 if the key does not exis...
Find k closest values in a BST
Find k closest values in a BST Given a binary search tree with n nodes and a real target t, return k node values whose distances to t are smallest. Im...
Implement Dependency-Aware Task Scheduler
This question evaluates skills in designing and implementing data structures and algorithms for priority scheduling, dependency resolution, and dynami...
Implement core graph algorithms for graphics
Implement core graph algorithms for graphics Given a scene or dependency graph, implement topological sort, BFS/DFS, and shortest path (Dijkstra). Dis...