Coding & Algorithms Interview Questions
Practice 3,429 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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"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
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Time-Based Key-Value Store
This question evaluates the ability to design a data structure that supports versioned storage and efficient point-in-time lookups. It tests binary se...
Moderator System with Ranking, Communities, and Demotion
This question tests practical data structure design and object-oriented system modeling, requiring the implementation of a hierarchical moderator mana...
Design a restaurant waitlist system
You are implementing the waitlist system for a restaurant. Parties arrive over time, can cancel, and get seated when a table becomes available. Rules ...
Build a Progressive Cloud Storage System
Build a Progressive Cloud Storage System The source reports four storage stages but not the exact API. The command encoding, quota accounting, compres...
Busiest Rental Car
This question evaluates a candidate's ability to simulate a resource-allocation process using interval scheduling and greedy assignment rules. It test...
Count Lucky Numbers in an Inclusive Range
Count Lucky Numbers in an Inclusive Range Problem A positive integer x is lucky when it is divisible by floor(sqrt(x)). Implement countLuckyNumbers(le...
Schedule Weekly Deployment Windows
Schedule Weekly Deployment Windows The source reports a weekly deployment-window scheduler. The absolute-time horizon, cyclic start == end rule, and c...
Solve Parser, Trading, Tree, And Deck Tasks
You will solve several independent programming tasks. For each task, implement clean, tested code and state the time and space complexity. 1. Validate...
Solve Grid Path and Unique Substring
This question evaluates algorithmic problem solving skills in grid traversal and stateful string processing, specifically testing understanding of pat...
Query a Versioned Array
Query a Versioned Array A fixed-length array starts with all values equal to zero. Process update, save, and get operations. An update changes one ind...
Verify Ordering Under a Scrambled Alphabet
Verify Ordering Under a Scrambled Alphabet Given a sequence of words and an alphabet string that lists every allowed character from smallest to larges...
Assign Tasks to the Minimum Number of Workers
Assign Tasks to the Minimum Number of Workers Problem Implement assignMinimumWorkers(tasks) -> workerIds. Each task is [startMinute, durationMinutes]....
Solve chat, grid paths, and car rentals
You are given three independent programming tasks. For each, describe and implement an efficient algorithm, and be prepared to analyze its time and sp...
Build a Banking System with Activity Rankings
Build a Banking System with Activity Rankings Problem Implement an in-memory banking system that processes these operations: - CREATE_ACCOUNT account_...
Find a Path Between Nodes in a Fibonacci Tree
Practice a Databricks coding interview problem focused on find a path between nodes in a fibonacci tree. The prompt emphasizes edge cases, clean imple...
Longest Run of Ones After One Flip
This question tests a candidate's ability to solve a sliding window problem involving binary arrays, extending the basic "maximum consecutive ones" pa...
Perform an External Merge Sort with a Heap
Perform an External Merge Sort with a Heap Sort an integer sequence using the two phases of external merge sort: create sorted runs that fit within a ...
Implement Queue Operations Using Two Stacks
Implement Queue Operations Using Two Stacks Process a sequence of queue operations using exactly two LIFO stacks as the queue's internal data structur...
Implement Python feature and resolver metaprogramming
You are given a skeleton for a small Python "feature" framework. The goal is to use metaprogramming to: 1. Parse type-annotated classes into Feature o...
Solve String Arrays and Row Deduplication
This multi-part question evaluates array and string manipulation skills, deduplication logic and pairwise character comparison, as well as the ability...