Software Engineer Coding & Algorithms Interview Questions
Practice 2,712 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."
How to find the cheapest flight within K stops
This question evaluates understanding of graph algorithms and constrained shortest-path modeling, focusing on reasoning about weighted directed edges,...
Compute final prices with next smaller discount
You are given an integer array prices of length n, where prices[i] is the original price of the i-th item. For each item i, find the first index j > i...
Implement LRU/LFU cache with custom eviction
This question evaluates proficiency in cache design and data-structure implementation, focusing on eviction policies (LRU, LFU), metadata tracking for...
Determine balanced k values in a permutation
You are given a permutation p of the integers 1..n. For a number k (where 1 <= k <= n), call k balanced if there exists a contiguous subarray p[l..r] ...
Implement worker time and payroll tracker
This question evaluates skills in designing in-memory data structures and algorithms for temporal event handling, interval arithmetic, stateful toggle...
Find minimum moves to solve the 15-puzzle
This question evaluates understanding of state-space search, heuristic reasoning, and solvability analysis for combinatorial sliding puzzles, testing ...
Implement idempotent request handling with idempotency keys
This question evaluates understanding of idempotency semantics, idempotency-key handling, concurrency control, synchronization, and in-memory TTL-base...
Extend a BFS maze solver stepwise
This question evaluates proficiency in grid-based graph traversal and pathfinding, covering BFS mechanics, stateful reachability with keys and doors, ...
Solve maze tasks and compute shortest routes
This multi-part question evaluates proficiency in grid-based pathfinding and shortest-path reasoning, debugging and incremental code extension, handli...
Group points by distance threshold
This question evaluates understanding of geometric graph construction and connectivity, computational geometry concepts such as Euclidean distance, an...
Can you visit all rooms and score parentheses?
Problem 1: Visit all locked rooms with keys There are n rooms labeled 0..n-1. All rooms are locked except room 0. - When you enter room i, you find a ...
Minimize operations to reduce integer to zero
This question evaluates algorithmic problem-solving and integer-manipulation skills, specifically assessing the ability to reason about operation coun...
Answer suffix maximum-frequency queries
This question evaluates algorithm design skills and array-processing competency for answering repeated queries efficiently, focusing on time and space...
Determine escape path with blockers and spreading fire
This question evaluates graph traversal and grid-based pathfinding skills, including connectivity analysis, obstacle handling, and reasoning about tim...
Find bounding boxes of connected houses
This question evaluates grid traversal and connected-component identification skills, specifically handling ragged 2D arrays, 4-directional adjacency,...
Compute sparse dot product and count islands
You are asked to solve two coding problems. Problem 1: Sparse vector dot product Given two vectors A and B of the same length n (potentially large, e....
Implement a fixed-capacity generic circular buffer
This question evaluates knowledge of data structure design, generic types, in-place memory allocation, and constant-time FIFO operations required for ...
Implement a single-thread task scheduler API
This question evaluates understanding of task scheduling, timing semantics, deterministic ordering, single-thread concurrency control, and data struct...
Merge intervals and design rating APIs
This question evaluates algorithmic problem-solving for interval manipulation and stateful data-structure design for maintaining and ordering agent av...
Find the longest palindromic substring
Problem Given a string s, find the longest contiguous substring of s that is a palindrome (reads the same forward and backward). Input - A string s co...