Software Engineer Coding & Algorithms Interview Questions
Practice 2,306 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"
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"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."
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"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."
Calculate transaction fees from CSV records
You are given a CSV-like multi-line string representing transactions with columns: id,reference,amount,currency,date,merchant_id,buyer_country,transac...
Apply commands to transform a matrix
You are given an integer matrix A of size n × m and a list of string commands to apply in order. Implement the commands and return the final matrix. C...
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...
Determine Straight Flush
Implement a function that determines whether a set of poker cards contains a straight flush. You are given a list of unique playing cards. Each card h...
Implement lazy array and KV store
You are asked two coding problems in the same interview round: 1. Implement a lazy array abstraction - Create a LazyArray<T> that wraps an input li...
Add two binary strings
You are given two binary strings a and b (each consisting only of characters '0' and '1'). Return their sum as a binary string. Input - a: string, len...
Design robot path boundedness with repeats
You are given a 2D grid with a set of blocked cells (obstacles) and a robot starting at (0, 0) facing north. The robot executes a finite instruction s...
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...
Implement a Cache Snapshot Printer
Implement an LRU-style cache and a snapshot-printing feature. The cache stores key-value pairs and has a fixed capacity. It should support normal cach...
Compute shortest path to collect all keys
You are given an m×n grid containing walls (#), open cells (.), a single start cell (@), up to six keys labeled 'a'–'f', and matching doors 'A'–'F' th...
Solve three algorithmic OA tasks
Task 1 (Odd-frequency string): Given an integer N in [1..200000], write an algorithm that returns any length-N string of lowercase letters (a–z) such ...
Implement iterators and write tests in Java
In Java, write everything from scratch (no IDE scaffolding): 1) Define a generic Iterator<T> interface with hasNext() and next(). 2) Implement ArrayIt...
Design time-based key-value store
Design an in-memory key-value store that supports time-based lookups. Operations Implement a class (or module) with the following methods: 1. set(key,...
Solve three coding problems
The interview note described the following coding questions: 1. Find the N-th license plate in lexicographic order - A license plate has exactly 6 ...
Solve string merge and grid path tasks
Question Given two equal-length strings s1 and s2, create a new string by iterating i = 0 … n-1, comparing s1[i] with s2[n-1-i]: append s1[i]; if the ...
Format messages with paginated suffixes
You are given a message string s and an integer width w. Split s into multiple chunks, preserving character order, and append a suffix "i/n" to each c...
Implement a match-3 board resolver
Question Implement a match-3 board resolver (the core loop of a "candy crush"-style game). You are given an m×n grid of cells. Each cell holds a value...
Design a time-windowed key-value store
Implement a time-windowed key-value store ("Windowed Map") that receives key/value updates at irregular times and only keeps entries from the most rec...
Calculate Per-User Usage Charges
Implement a billing function for an AI text API. You are given usage records for a single billing cycle. Each record contains: - user_id - input_token...
Solve Three OA Coding Tasks
This online assessment included the following coding problems: 1. Reverse the middle of vowel-bounded words You are given an array of lowercase str...