Coding questions

1,899 resources · Page 32 of 80

1. Coding questions · PayPal

   Explain Window Functions and Joins in SQL and Python

   This question evaluates proficiency in SQL and Python data manipulation, covering window functions, join semantics (INNER, LEFT, RIGHT, FULL, CROSS), ranking functions, group and string aggregation, type casting, and building row-wise accumulations in Python, and it falls under the Data Manipulation (SQL/Python) category.

2. Coding questions · Amazon

   Explore Subscription Patterns and Status Transitions with SQL/Pandas

   This question evaluates proficiency in time-series and event-sequence data manipulation, temporal aggregation, and data quality validation using SQL and pandas, focusing on identifying status transitions and date-based uniqueness.

3. Coding questions · Spokeo

   Explore Titanic Dataset: Survival Rates, Age, and Correlations

   This question evaluates exploratory data analysis, descriptive statistics, group-wise aggregation, correlation interpretation, and data visualization skills in a Data Manipulation (SQL/Python) context for a data scientist role.

4. Coding questions · Meta

   Extend cloud file system with copy and compression

   This question evaluates understanding of data structures and algorithms for stateful resource management, covering bookkeeping of per-user quotas, file metadata operations (copy, compress/decompress), string filtering and sorting, and efficient selection and deletion of largest elements.

5. Coding questions · Roblox

   Extend counter to per-client rate limiting

   This question evaluates competency in designing per-client, time-windowed rate limiting using efficient data structures for time-based eviction and counting within the Coding & Algorithms domain.

6. Coding questions · Reevo

   Fetch and aggregate paginated team data via API

   This question evaluates API integration, pagination handling, robust error handling (retries/backoff and rate-limit awareness), data aggregation, sorting and top‑N selection skills within the Data Manipulation (SQL/Python) domain.

7. Coding questions · Armada

   Fetch paginated data from two APIs

   This question evaluates a candidate's competency in robust API retrieval, pagination handling, defensive data validation, and joining records across endpoints while preserving the order of source records and safely handling missing or malformed fields.

8. Coding questions · Salesforce

   Fewest Add-or-Subtract Power-of-Two Steps to Reduce n to Zero

   An integer problem: reduce a positive n to zero with the fewest operations, where each operation adds or subtracts a power of two. It tests reasoning about binary representations, proving a strategy optimal, and working safely with integers larger than 32 bits.

9. Coding questions · Otter.Ai

   Fewest Adjacent-GCD Operations to Turn Every Array Element into 1

   Given an array of positive integers, find the fewest operations that make every element 1, where each operation replaces one of two neighboring values with their greatest common divisor, or return -1 if it cannot be done. Tests GCD properties, lower-bound reasoning and careful case analysis on small arrays.

10. Coding questions

    Fewest Days to Read a Book When Chapters Cannot Be Split Across Days

    Given the reading time available on each day and the time each chapter of a book takes, find the fewest days needed to read every chapter in order when a chapter can never be split across days, or report that the book cannot be finished. It tests simulation with per-day capacity, ordering constraints, and impossible cases.

11. Coding questions · Microsoft

    Fewest Distinct Values to Delete So at Least Half the Array Is Removed

    A coding question that asks for the fewest distinct values whose complete deletion removes at least half of an integer array. It tests reasoning about how often each value occurs, proving that a choice is minimal, and the exact meaning of half when the array length is odd.

12. Coding questions · Squarepoint

    Fewest Increment-All-but-One Moves to Make Array Values Equal

    From a Squarepoint technical screen: one move adds 1 to every element of an integer array except one chosen element, and you must find the fewest moves that make all elements equal. It tests reasoning about what each move really changes, along with negative values and answers beyond the 32-bit range.

13. Coding questions · Salesforce

    Fewest Repeat-Free Pieces After Deleting Every Copy of One Letter

    A string problem: delete every occurrence of one chosen lowercase letter, then split what remains into the fewest contiguous pieces with no repeated letters. It tests reasoning about optimal partitions, evaluating every deletion choice efficiently, and edge cases on strings up to 200,000 characters.

14. Coding questions · Elevenlabs

    Fewest Stones Left After Merging Equal-Level Pairs

    Each stone has an integer level, and two stones of the same level can be merged into one stone of the next level, with merged stones able to merge again. Return the fewest stones that can remain after any sequence of merges, a problem that tests counting by level, cascading merges, and efficient handling of large inputs.

15. Coding questions · Pinterest

    Fewest Subsequences of a Source String That Concatenate to a Target String

    Given a source string and a target string, return the fewest subsequences of the source whose concatenation equals the target, or -1 when the target cannot be formed. It tests subsequence matching, greedy reasoning about why a choice is optimal, and an efficient iterative implementation.

16. Coding questions · Visa

    Fewest Terms to Write an Integer as 1, 2 or 3 Plus Even Powers of Two

    For every integer in an array, find the fewest terms that sum to it when exactly one term is 1, 2 or 3 and every other term is a power of two with an even exponent, such as 4, 16 or 64, or return -1 when this is impossible. It tests number-theoretic reasoning about divisibility and minimal representations under large input sizes.

17. Coding questions · Microsoft

    Fill rooms with nearest-gate distance

    This Coding & Algorithms question evaluates algorithmic problem-solving with grid-based graph traversal and shortest-distance computation, assessing data-structure use and implementation-level efficiency for software engineers.

18. Coding questions · Meta

    Fill rooms with nearest gate distances

    This question evaluates grid-based graph traversal and algorithmic problem-solving skills, including concepts such as multi-source breadth-first search, handling sentinel values, and performing in-place updates.

19. Coding questions

    Filter Logs by an Ordered Severity Threshold

    Filter structured logs by an ordered minimum severity, preserving threshold-and-higher records while handling empty and unknown levels under an explicit contract.

20. Coding questions · Atlassian

    Find 2023 NCAA championship winner

    This question evaluates proficiency in SQL data manipulation and relational reasoning, testing the ability to identify a championship winner from game result records across related tables in the Data Manipulation (SQL/Python) domain for data scientist roles.

21. Coding questions · Uber

    Find a Bounded Subarray and Largest Square

    This question evaluates array manipulation and algorithmic problem-solving skills across two tasks: enforcing bounded value ranges within contiguous subarrays and identifying largest uniform square regions in binary matrices, exercising concepts such as range-tracking, efficient data structures, and dynamic programming.

22. Coding questions · Salesforce

    Find a Celebrity from a Knows Matrix

    Find a celebrity in a knows matrix with linear candidate elimination followed by complete verification that the candidate knows nobody and is known by everyone else.

23. Coding questions · HubSpot

    Find a special person using knows(a,b)

    This question evaluates algorithmic reasoning about pairwise relation inference using an oracle-style knows(a, b) API and the ability to minimize API calls, testing skills in graph modeling and asymptotic analysis.

24. Coding questions · Meta

    Find a String Containing Another

    This question evaluates proficiency in string algorithms, substring search techniques, and algorithmic complexity analysis within the Coding & Algorithms domain.