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."
Infection Spread Time on a Grid
Infection Spread Time on a Grid You are given an m x n grid where every cell holds one of three integer values: - 0 — an empty cell that can never be ...
Solve several coding interview problems
This set of problems evaluates proficiency in string processing and combinatorial parsing, arbitrary-precision arithmetic using string representations...
Decode an encoded string
Implement a decoder for an encoded string where repetition is expressed with a number followed by a bracketed substring. Rules: - A pattern k[substrin...
Match payments to invoices with fallback rules
This question evaluates a candidate's ability to design robust record-matching logic that handles identifier-based matches, fallback heuristics, and n...
Find linked user records by weighted similarity
This question evaluates skills in similarity-based record linkage, weighted field scoring, and graph connectivity analysis within the Coding & Algorit...
Validate CSV rows under multiple verification rules
This question evaluates skills in CSV parsing, string normalization and multi-rule data validation, covering whitespace handling, length checks, case-...
Implement array rotations and CSV keyword search
Problem A — Rotate an array left/right by k You are given an integer array nums of length n and an integer k. 1. Implement rotateLeft(nums, k) that re...
Return Binary Tree Nodes in Vertical Order
Return Binary Tree Nodes in Vertical Order A binary tree has nodes numbered from 0 through n - 1, with node 0 as the root. Arrays left and right conta...
Find Duplicate Files
Implement a file deduplication tool. You are given a root directory containing many files. Return groups of duplicate files. Two files are duplicates ...
Maximize area between vertical lines
This question evaluates algorithmic reasoning with arrays and the ability to optimize pairwise measurements, specifically assessing understanding of h...
Expand Nested Repetition Expressions
This question evaluates understanding of string parsing and nested structure handling, including skills in recursion, stack-based parsing, tokenizatio...
Implement Validation and String Compression
This question evaluates string processing, input validation, tokenization, hierarchical string manipulation, and algorithmic complexity analysis skill...
Detect fraud events and extract PII
This question evaluates skills in parsing nested event data, extracting and deduplicating PII fields, and performing key-based correlation to detect r...
Count ways to make change (DP)
This question evaluates understanding of dynamic programming and combinatorial counting, focusing on unbounded coin usage and counting order‑independe...
Rebalance shard ranges under overlap limit
This question evaluates skills in interval and range management, constraint enforcement, and algorithmic problem solving related to overlapping intege...
Simulate meeting-room bookings and return busiest room
This question evaluates a candidate's competence in scheduling and resource-allocation algorithms, focusing on simulation of interval-based bookings, ...
Implement a crypto order management system
You are building an in-memory crypto order management system. You must parse commands from standard input and print outputs for query commands. Order ...
Implement a custom list with iterator and map
This question evaluates proficiency in data structures and generic collection implementation, specifically list operations, iterator semantics, and hi...
Solve three coding rounds
This multi-part question evaluates algorithmic problem-solving and practical implementation skills, covering grid geometry and distance metrics for ne...
Answer common graph, grid, and array tasks
This set of problems evaluates algorithmic skills across arrays, graph theory, and grid/matrix traversal—covering sliding-window and contiguous-segmen...