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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Implement Document Predicate APIs
Design a simple document service that stores text documents identified by filename. Implement these APIs: - InsertDoc(filename, content): store or ove...
Determine Exact Layover Booking
This question evaluates a candidate's competency in algorithmic problem solving, numerical precision handling, and combinatorial selection under exact...
Maximize Boundary-Difference Subarray Sum
Given an integer array nums and an integer k, find the maximum possible sum of a non-empty contiguous subarray whose first and last elements differ by...
Count People Reaching the Boundary
You are given a 1-dimensional line segment with a right boundary at position L. There are N people with initial positions p1, p2, ..., pN, and there i...
Build a File-Backed Key-Value Store
This question evaluates a candidate's understanding of persistent key-value storage, in-memory versus on-disk state management, serialization/deserial...
Implement Terminal Tabs and Split Panels
Implement a data structure that models a terminal application with multiple tabs and split panels. Requirements: - A Terminal can create and store mul...
Implement Chat Event Counter
Design an in-memory counter for chat activity. You need to implement a class with the following two methods: `text processEvent(userId: string, chatId...
Find the Next Larger Palindrome
Given a positive integer n, return the smallest integer strictly greater than n whose decimal representation is a palindrome. A palindrome reads the s...
Implement SQL Table and DNA Ordering
Two independent coding exercises were asked. Solve both. Problem A: CSV-backed in-memory table Build a tiny in-memory relational table initialized fro...
Print a Centered Pascal Triangle
Given a positive integer height, generate the first height rows of Pascal's triangle and print them as a centered text triangle. Formatting requiremen...
Implement a DAG task graph
This question evaluates competency with directed acyclic graphs, graph algorithms (topological sorting), dependency modeling, and implementing data st...
Simulate and Construct Tournament Rankings
You are given a single-elimination tournament represented by an array of ranks. The array is a permutation of the integers 1..n, where a smaller numbe...
Solve Union-Find, Graph, and Stream Problems
Solve the following independent coding problems. 1. Merge Product Categories You are given a list of tuples (productA, productB). Each tuple means the...
Assign Pins to Shortest Columns
You are given a list of pins, where each pin has a height, and a fixed number of columns in a masonry-style layout. Process the pins in their original...
Find the Critical Path
You are given a project represented as a directed acyclic graph of tasks. Each task has: - a unique task name - a list of prerequisite task names - a ...
Build a Pivot Table Aggregator
Implement a function that builds a pivot table from a list of records. Each record contains a row_key, a column_key, and a numeric value. Requirements...
Solve Linked-List and Iterator Problems
You are asked to solve two coding problems. Problem 1: Detect shared nodes between possibly cyclic linked lists You are given the heads of two singly ...
Find Shortest Paths to Target Nodes
You are given a weighted directed graph representing distances between nodes. - There are n nodes labeled from 0 to n - 1. - edges[i] = [u, v, w] mean...
Solve two interview coding problems
The interview included two coding problems. Problem 1: Find valid robot locations in a grid You are given a 2D grid containing empty cells and obstacl...
Infer an Unknown Alphabet Order
You are given a list of words that is already sorted according to an unknown alphabet. Derive one valid ordering of the characters in that alphabet. R...