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Coding & Algorithms Interview Questions
Practice 9403 coding, system design and machine learning questions from 546 companies, sorted by role, topic and interview round. Every question has step-by-step hints, a code runner that supports 8 languages and an AI mentor; members also get the full solution walkthrough.
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- 11
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Showing 1–30 of 1706 results
- 6SenseMediumSoftware EngineerCount Squares from Points in the Plane
This problem tests your ability to efficiently store spatial coordinates and leverage geometric properties (like midpoints or diagonals) to detect squares within a 2D plane.
Coding & AlgorithmsTechnical ScreenGeometryHash SetArrays - Abnormal SecurityMediumSoftware EngineerDesign a duplicate-file removal algorithm
Design a duplicate-file removal algorithm evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsTechnical Screen - AccentureMediumSoftware EngineerFind minimum racks for 2D bin packing
This question evaluates understanding of combinatorial optimization and multi-dimensional bin packing, assessing algorithmic design, resource-allocation reasoning, and computational complexity awareness.
Coding & AlgorithmsTechnical Screen - AddeparMediumSoftware EngineerImplement a Transactional In-Memory Table
Design an in-memory tabular data store that supports transactional modifications (create, update, delete, find-and-replace) with commit and rollback capabilities.
Coding & AlgorithmsTechnical ScreenObject-Oriented DesignData StructuresDatabase Internals - Additive AiMediumSoftware EngineerAdvance Game of Life with Reduced Auxiliary Storage
This problem tests array manipulation techniques, specifically bitwise operations and modular arithmetic, to transform a grid in-place while preserving original state information for simultaneous updates.
Coding & AlgorithmsTechnical ScreenArraysBit ManipulationMatrix - AdiaEasyData ScientistCompute Score Difference in Reversing Array Game
This question tests the ability to manage state changes while iterating through an array based on index-dependent rules, specifically involving conditional array modifications.
Coding & AlgorithmsTechnical ScreenArraysSimulationDeque - AdobeMediumSoftware EngineerBuild a React team builder with role constraints
This problem tests your ability to manage complex UI state in React, enforce business constraints (role limits) during data manipulation, and implement stable UI rendering based on sorted state.
Coding & AlgorithmsTechnical ScreenReactState ManagementFrontend - AdobeMediumSoftware EngineerDesign a nested-list iterator
This question evaluates the ability to implement an efficient iterator over nested lists, testing skills in iterator state management, lazy traversal, explicit stack usage, and algorithmic complexity reasoning.
Coding & AlgorithmsTechnical Screen - AdobeMediumSoftware EngineerDetermine feasible task ordering
This question evaluates knowledge of graph algorithms and dependency management, emphasizing concepts such as topological ordering and cycle detection and the ability to determine feasibility and produce a valid execution sequence.
Coding & AlgorithmsTechnical Screen - AdobeMediumSoftware EngineerDetermine task order with prerequisites
This question evaluates a candidate's proficiency with graph-theoretic concepts like dependency modeling and cycle detection, and their ability to produce valid task orderings under constraints within the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - AdobeMediumMachine Learning EngineerImplement K-means clustering from scratch
This problem tests your understanding of the K-means clustering algorithm, specifically the iterative process of centroid initialization, assignment, and update steps.
Coding & AlgorithmsTechnical ScreenK-meansClusteringUnsupervised Learning - AdobeMediumSoftware EngineerImplement file word count
This question evaluates a candidate's skills in text processing, large-scale I/O, token normalization, memory-constrained computation and algorithmic trade-offs for frequency aggregation, and it falls under the Coding & Algorithms domain because it combines parsing, data structures and external processing concerns.
Coding & AlgorithmsTechnical Screen - AdobeMediumSoftware EngineerTraverse a path and print directory tree
This problem tests your ability to recursively traverse a directory structure and format the output into a human-readable, indented tree structure while handling potential I/O errors.
Coding & AlgorithmsTechnical ScreenRecursionNode.jsFilesystem - AdyenMediumSoftware EngineerImplement LRU and target-sum combinations
Implement LRU and target-sum combinations evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsTechnical Screen - AeoneaMediumSoftware EngineerFind two numbers summing to target
This question evaluates algorithm design and complexity analysis skills, specifically the ability to identify element pairs in arrays and reason about time-space tradeoffs.
Coding & AlgorithmsTechnical Screen - AeoneaMediumSoftware EngineerImplement a tennis score tracker
This question evaluates a candidate's ability to implement stateful scoring logic and choose appropriate data structures for tracking sequential events, specifically handling tennis scoring rules such as 0/15/30/40 progression, Deuce, Advantage, and the two-point lead requirement.
Coding & AlgorithmsTechnical Screen - AffirmMediumSoftware EngineerAggregate loans and match repayments
Implement a transaction matching engine that aggregates user loans and allocates repayments chronologically to outstanding balances using a FIFO waterfall approach.
Coding & AlgorithmsTechnical Screenarrayshash-tablesorting - AffirmMediumSoftware EngineerDetect fraud events and extract PII
This problem tests your ability to process nested JSON-like structures, perform deduplication, and map related entities to detect fraudulent patterns.
Coding & AlgorithmsTechnical ScreenGraphHash MapDSU - AffirmMediumSoftware EngineerDetermine Redeemable Promotion Offers
This problem tests your ability to manage stateful constraints by processing a stream of promotional event logs to determine if a user remains eligible for a discount based on a per-user, per-promotion usage limit.
Coding & AlgorithmsTechnical ScreenHashMapsDataAggregationStreamProcessing - AffirmMediumSoftware EngineerFind shortest unique substring per word
This problem tests your ability to manipulate string data structures (like Tries or Suffix Trees) to efficiently identify the shortest, lexicographically smallest substring that is unique to a given word within a provided collection.
Coding & AlgorithmsTechnical ScreenStringsTrieHash Map - AgodaMediumSoftware EngineerCompute triangle min path and dice stopping stats
This composite question evaluates dynamic programming and algorithmic optimization via the triangle minimum path problem and probability, stopping-time analysis and Monte Carlo simulation through the two-dice experiment, testing competencies in DP, discrete probability, expected-value reasoning and empirical estimation.
Coding & AlgorithmsTechnical Screen - AgodaEasyData EngineerCount Integers That Appear Exactly Once
Count distinct integers with frequency exactly one using complete occurrence counts, including empty arrays and separated duplicates.
Coding & AlgorithmsTechnical Screen - AgodaMediumSoftware EngineerFind two numbers that sum to a target
This question evaluates array manipulation, index-based reasoning, and algorithmic problem-solving skills related to identifying value pairs that meet a numeric target.
Coding & AlgorithmsTechnical Screen - Ai2MediumSoftware EngineerMaintain an Out-of-Order Step Progress Tree
This problem tests tree reconstruction from a stream of out-of-order parent-child updates, requiring efficient hierarchical state management and cycle detection.
Coding & AlgorithmsTechnical ScreenTreesGraphsData Structures - Aim Intelligent MachineMediumSoftware EngineerMerge Overlapping Closed Intervals into a Sorted Disjoint List
Tests sorting and linear scanning techniques to merge overlapping closed intervals, with attention to shared boundaries, nested ranges, and large input scale.
Coding & AlgorithmsTechnical ScreenIntervalsSortingArray - AirbnbMediumSoftware EngineerCompute minimum-cost service cover
This question evaluates proficiency in combinatorial optimization and set-coverage with cost minimization, including handling case-insensitive service matching and enumerating minimal solution combinations.
Coding & AlgorithmsTechnical Screen - AirbnbMediumSoftware EngineerCompute split-stay listing pairs
This question evaluates the ability to manipulate interval availability data, reason about contiguous date ranges and split boundaries, and design efficient pairing algorithms with attention to time and space complexity.
Coding & AlgorithmsTechnical Screen - AirbnbMediumSoftware EngineerConstruct smallest number from I/D pattern
This problem tests greedy algorithm design and stack-based data structure manipulation to satisfy relative ordering constraints within a sequence of digits.
Coding & AlgorithmsTechnical ScreenGreedyStackStrings - AirbnbMediumSoftware EngineerCount Candies from Unlockable Boxes
Determine the maximum number of candies you can collect given an initial set of boxes, where each box may be locked or unlocked, contain candies, contain keys to other boxes, and contain other boxes.
Coding & AlgorithmsTechnical ScreenBreadth-First SearchGraphQueue - AirbnbMediumSoftware EngineerDesign and implement Connect Four engine
This question evaluates a candidate's competency in algorithmic problem solving, data structure selection, API design, complexity analysis, and testing through implementation of a Connect Four game engine.
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