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.
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Generate Tower of Hanoi moves
You are given n disks of different sizes stacked on peg A (largest at bottom). You have two other pegs, B and C. You may move one disk at a time, and ...
Compute Latencies and Search Grid Path
You are given two coding tasks from an internship interview. Task 1: Compute Message Latency from CSV Logs Two systems, ComputeA and ComputeB, exchang...
Construct a BST and read spiral order
The coding round reportedly included two algorithmic tasks: 1. Rebuild a binary search tree from a preorder sequence - You are given an array of di...
Evaluate an arithmetic expression
Write a function that evaluates a mathematical expression given as a string. Requirements: - Supports non-negative integers and whitespace. - Supports...
Implement Employee Validation and Snake
This interview covered two coding tasks: 1. Employee validation - Implement a function that validates a collection of employees against a set of bu...
Evaluate a Piecewise Linear Function
This question evaluates understanding of linear interpolation, numerical reasoning with ordered 2D points, and input validation when computing values ...
Parse Query Parameters Into a Map
Implement a function that parses the query portion of a GET URL and returns a map from query keys to parsed values. Input is a string that may start w...
Implement Parallel Image Processing
Build an image-processing utility in Python using the Pillow library. You are given a collection of image file paths and an output directory. For each...
Implement 2048 Game Logic
Implement the core movement logic for the 2048 game. You are given an n x n integer board where 0 represents an empty cell and every nonzero value rep...
Implement a Timestamped Counter
This question evaluates the ability to design and implement time-indexed counting data structures, reason about strictly increasing timestamps and que...
Simulate a rover fleet
This question evaluates skills in simulation design, state management, grid-based movement logic, and handling constraints such as obstacles, boundari...
Optimize a Fifteen-Sum Card Strategy
This question evaluates algorithmic problem-solving, debugging, simulation-based testing, and strategy optimization using techniques such as search, m...
Implement Factorial and Squares
Question In a live coding interview, write two Python functions and be ready to discuss their behavior. 1. factorial(n): Given a non-negative integer ...
Solve DFS grid and keypad problems
You may be asked to solve one or more DFS/backtracking problems: 1. Grid connectivity problem: Given an m x n grid where 1 represents land and 0 repre...
Implement a disk space manager with eviction
Design and implement an in-memory disk space manager that stores datasets by datasetId with a given size (e.g., in MB). The manager has a fixed total ...
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...
Merge overlapping weekly time intervals
You are given a list of time intervals representing meetings. Each interval is a pair of strings in the format: - "<Day> <H>:<MM>" (24-hour time) - <D...
Compute letter frequencies from encoded string
Problem You are given an encoded string s representing a string of lowercase English letters (a–z). The encoding follows these rules: 1. Letters a to ...
Check whether brackets are balanced
This question evaluates a candidate's competency in string processing and bracket-matching concepts, testing familiarity with linear-time algorithms a...
Solve sliding-window and disjoint-string-pairs tasks
This question evaluates proficiency in string-processing algorithms, sliding-window techniques, efficient set or bitmask representations, and combinat...