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."
Report Where a Value Appears
Report Where a Value Appears Given a target and an even-length integer list, return four binary flags describing whether the target occurs: 1. at an e...
Remove Duplicate Integers While Preserving Order
Remove Duplicate Integers While Preserving Order Return the distinct integers from an input list in the order of their first appearance. Function Sign...
Compute a Point Set's Bounding Rectangle
Compute a Point Set's Bounding Rectangle Given two-dimensional integer points, return the smallest axis-aligned rectangle containing every point. Repr...
Find Two-Word Compound Words
Given a list of unique lowercase words, return every word that can be formed by concatenating exactly two other words from the same list. For each com...
Implement Regular Expression Matching
Implement Regular Expression Matching Determine whether an entire input string matches a pattern containing lowercase letters and two special symbols:...
Unify Stock-Trading Profit Variants
Unify Stock-Trading Profit Variants Given daily stock prices, return the maximum profit when you may complete at most max_transactions buy-then-sell t...
Find the Nearest Target Character and Support Streaming Updates
Given an array of characters and a target character, return the distance from each index to the nearest target occurrence, or -1 if the target never a...
Return All Nodes Reachable from a Starting Vertex
Given directed edges and a starting vertex, return all vertices reachable from the start, including the start. The graph may contain cycles. Implement...
Simulate Alternating Stick Collection for a Nest
A bird is building a nest in a forest represented by an array forest. Positive integers are sticks, where the integer value is the stick length. Zeroe...
Count Length-3 Chat Substrings with a Vowel
You are developing an automatic moderation system for a chat application that detects simple linguistic patterns. Given a string chatMessage, count ho...
Count the Ways to Split a Digit String into Primes
You are given a string s consisting of decimal digits ('0'–'9') that represents a positive integer. Count the number of ways to split s into a sequenc...
Find a Valid Task Execution Order with Dependencies
You are building the task scheduler for a CI/build system. There are n build tasks labeled from 0 to n - 1. Some tasks cannot start until certain othe...
Increment a Digit-Array Integer by One
Increment a Digit-Array Integer by One You are given a non-empty array digits in which each element is a single decimal digit (0-9). The array represe...
Count the Ways to Decode a Numeric Cipher
A substitution cipher maps each uppercase English letter to a number: 'A' → 1, 'B' → 2, …, 'Z' → 26. To encode a word, every letter is replaced by its...
Identify a Target Word with Repeated Minimax Guesses
Identify a Target Word with Repeated Minimax Guesses A hidden target is guaranteed to be one of the supplied words. You may repeatedly submit any word...
Thread-Safe Token-Bucket Rate Limiter
Thread-Safe Token-Bucket Rate Limiter Design and implement a thread-safe rate limiter using the token bucket algorithm. The limiter is shared by many ...
Group Anagrams
Group Anagrams Given an array of strings words, group together all strings that are anagrams of one another and return the groups. Two strings are ana...
Smallest Covering Window in a String
Smallest Covering Window in a String You are given two strings, source and target. Return the shortest contiguous substring of source that contains ev...
Sort a String of Clothing Sizes
Sort a string containing only S, M, and L into size order in linear time. Extend the discussion to custom token orderings, unknown-size behavior, empt...
Same-Domain Web Crawl (BFS)
This question evaluates a candidate's ability to implement graph traversal using breadth-first search while applying a domain-matching filter and dedu...