Coding questions

1,899 resources · Page 28 of 80

1. Coding questions · Character.AI

   Design timestamped key-value map

   This question evaluates the ability to design a timestamped key-value data structure, testing competencies in time-based indexing, ordered retrieval, and data structure selection for efficient timestamp queries.

2. Coding questions · Uber

   Design top-K frequency structure

   This question evaluates ability to design efficient in-memory data structures for frequency tracking, including handling recency-based tie-breaking, memory bounds under churn, and concurrency implications.

3. Coding questions · Snowflake

   Design transactional in-memory key-value store

   This question evaluates understanding of in-memory key–value store semantics, transactional and nested transaction behavior, and practical competencies in hash-based data structures and thread-safety for concurrent access.

4. Coding questions · Akuna Capital

   Design two-user communications handler with exceptions

   This question evaluates object-oriented design, state management, and custom exception handling skills for enforcing a single active communication pair and related invariants between two users.

5. Coding questions · Bloomberg

   Design variable-size LRU cache

   This question evaluates understanding of cache design and eviction policies (LRU), management of variable-sized entries and memory budgeting, and the implementation of efficient data structures that support amortized O(1) access, updates and correct capacity accounting.

6. Coding questions · Meta

   Detect a Contiguous Subarray with a Target Sum

   Determine whether an integer array containing negative values has any nonempty contiguous subarray that equals a target, using prefix sums for a linear-time solution.

7. Coding questions · Amazon

   Detect cycle in a directed graph

   This question evaluates mastery of graph algorithms and graph theory concepts—specifically directed cycle detection—and assesses the ability to reason about algorithmic correctness and to analyze time and space complexity for competing approaches.

8. Coding questions · Uber

   Detect cycle in directed dependency graph

   This question evaluates understanding of graph theory and algorithmic problem-solving, specifically cycle detection in directed dependency graphs and the ability to reason about combined edge sets across multiple dependency arrays.

9. Coding questions · Amazon

   Detect cycles in lists and graphs

   This question evaluates understanding of cycle detection in linked lists and directed graphs, assessing competencies in pointer manipulation, graph traversal strategies, and reasoning about algorithmic time and space complexity within the Coding & Algorithms domain.

10. Coding questions · Meta

    Detect earliest collision among moving cars

    Evaluates continuous kinematics and collision-detection concepts—solving quadratic and linear motion intersections, numerical robustness, and algorithmic time-complexity trade-offs—within the Coding & Algorithms domain for a Data Scientist role at a medium-to-advanced abstraction level.

11. Coding questions · Anthropic

    Detect runs and answer suffix queries

    This question evaluates proficiency in array processing, run-length detection, algorithmic complexity analysis, and the use of range/suffix data structures within the Coding & Algorithms domain.

12. Coding questions · Coinbase

    Detect sequence rule and repair anomaly

    This question evaluates a candidate's skill in sequence pattern recognition, algorithm design, complexity analysis, and robust integer arithmetic by requiring inference among arithmetic, alternating-difference, geometric, and Fibonacci-plus-constant models while tolerating at most one corrupted term under O(n) time and O(1) extra space constraints.

13. Coding questions · Apple

    Detect sessions and gaps using SQL LEAD

    This question evaluates proficiency in SQL time-series and event-stream manipulation, focusing on window-function techniques for sessionization, timestamp arithmetic, and aggregation to produce session-level metrics, targeting Data Manipulation (SQL/Python) competencies relevant to data scientist roles.

14. Coding questions · Jerry.Ai

    Determine a one-step string transformation

    This question evaluates proficiency in string manipulation and algorithmic reasoning, focusing on edit operations, positional changes, and edge-case handling.

15. Coding questions · Snapchat

    Determine and print expression to reach target

    This question evaluates skill in constructing and evaluating arithmetic expressions, handling numerical stability (including division-by-zero and floating-point tolerance), and reasoning about combinatorial permutations of numbers and operators.

16. Coding questions · Point72

    Determine Circle Intersection Status for Rendering Order

    This question evaluates geometric reasoning and computational-geometry competency, including spatial relationship analysis and handling numerical edge cases relevant to pairwise object interaction.

17. Coding questions · Waymo

    Determine Complete Interval Coverage

    This question evaluates understanding of interval coverage, streaming or online algorithms, and data structures for maintaining dynamic unions of intervals as points arrive.

18. Coding questions · Capital One

    Determine Country with Most 'Sunny' Days

    This question evaluates proficiency in data aggregation, grouping, and filtering to summarize categorical time-series records using SQL or equivalent Python data-manipulation tools, and it belongs to the Data Manipulation domain with an emphasis on practical application of query and aggregation techniques.

19. Coding questions · DoorDash

    Determine equality after limited swaps

    This question evaluates string manipulation and combinatorial reasoning about character swaps and anagram formation, focusing on competencies such as frequency analysis and reasoning about minimal edit operations.

20. Coding questions · Adobe

    Determine 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.

21. Coding questions · TikTok

    Determine frog reachability across stones

    This question evaluates dynamic programming, state-space reachability, and constrained transition reasoning, along with skills in hash-based memoization and time/space complexity analysis.

22. Coding questions · Shopify

    Determine Growth of Pirated Theme Installations Over Years

    This question evaluates proficiency in SQL-based data manipulation and analytics, focusing on computing time-based cohort percentages and conducting year-over-year trend analysis of merchant behavior.

23. Coding questions · Adobe

    Determine if a multiple-sum subarray exists

    This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Determine if a multiple-sum subarray exists states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

24. Coding questions · TikTok

    Determine if a string can be segmented

    This question evaluates a candidate's understanding of dynamic programming and string-processing skills, along with algorithmic complexity analysis for segmentation problems.