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1. Coding questions · Purestorage

   Determine whether points form squares

   This question evaluates computational geometry, combinatorial counting, and algorithmic optimization skills by requiring validation of a non-degenerate square from four 2D integer points and counting distinct squares in a larger point set, and it falls under the Coding & Algorithms category.

2. Coding questions · ByteDance

   Determine whether squares can fit

   This question evaluates spatial reasoning, combinatorial packing, and constraint-satisfaction skills in the context of placing integer-aligned squares within an m x n rectangle.

3. Coding questions · Pinterest

   Develop Auto-Complete System for Dish Suggestions

   This question evaluates a candidate's competency in building efficient auto-complete systems, covering prefix-based search, string processing, ranking by popularity, and handling real-time updates and performance trade-offs.

4. Coding questions · LinkedIn

   Device Status without Timestamps

   This question evaluates data manipulation and behavioral analytics competencies, emphasizing aggregation, deduplication, distinct counts, and date-based filtering to measure author and viewer activity.

5. Coding questions · Yahoo

   Diagnose DAU drop with SQL by country

   This question evaluates SQL data-manipulation and analytical skills, including DAU aggregation with per-day deduplication, date-range baseline averaging, experiment-treatment exclusion, country-level cohorting, and new vs returning user segmentation.

6. Coding questions · Amazon

   Diagnose MySQL joins and GROUP BY/HAVING errors

   This question evaluates mastery of SQL join semantics (LEFT, RIGHT, FULL OUTER emulation, CROSS), NULL equality and duplicate handling, GROUP BY/HAVING behavior under ONLY_FULL_GROUP_BY, aggregation result shaping and type/format conversions in the Data Manipulation (SQL/Python) domain.

7. Coding questions · Rbcroyalbank

   Differentiate pandas objects and SQL filters

   This question evaluates understanding of pandas data structures (Series vs DataFrame), SQL filtering and aggregation semantics (WHERE vs HAVING), and the ability to construct SQL queries to identify duplicate records.

8. Coding questions · Waymo

   Does a Seven-Segment LED Digit Display Read the Same Rotated 180 Degrees?

   Decide whether a row of digits on a seven-segment LED display reads the same after the whole display is rotated by 180 degrees. Tests modeling each digit as lit segments, mapping segments under rotation, and comparing the reversed display.

9. Coding questions · Harvey

   Eager Spreadsheet Formulas with Constant-Time Reads

   Implement eager spreadsheet formulas with constant-time cached reads, transitive dependency updates, cycle rejection, and atomic definition replacement.

10. Coding questions · Apple

    Encode and Rebuild a Binary Tree

    This question evaluates skills in data structure serialization and deserialization, binary tree representation, and algorithmic design for deterministic data formats.

11. Coding questions · Epic

    Encode Letters with a Telephone Keypad

    Encode letters as telephone keypad presses, ignoring case and spaces and inserting a separator whenever consecutive encoded letters share the same key.

12. Coding questions · Waymo

    End-Picking Number Game: Can the First Player Win Under Optimal Play?

    Two players alternately take a number from either end of a row and add it to their score; decide whether the first player can finish with at least as many points as the second under optimal play. Tests minimax reasoning and memoized game-state search.

13. Coding questions · Amazon

    Ensure Correct Numeric Ordering in Visit ID Comparison

    This question evaluates understanding of data typing and comparison semantics in SQL and Python, specifically how string versus numeric representations affect ordering and sequencing; it is categorized under Data Manipulation (SQL/Python) and examines both conceptual understanding and practical application.

14. Coding questions · ByteDance

    Enumerate All Simple Directed Cycles

    Enumerate distinct simple directed cycles using a canonical representation that handles rotations, opposite directions, and self-loops.

15. Coding questions · ByteDance

    Equalize Root-to-Leaf Sums in an N-ary Tree

    Find the minimum total increments needed to make every root-to-leaf path in a nonnegative-valued N-ary tree have the same sum. The parent-array input may contain 200,000 nodes and a depth beyond Python's recursion limit.

16. Coding questions · Airbnb

    Estimate Page-Visit Duration from the Next User Event

    Estimate page-visit duration with each user’s next event, deterministic timestamp ties, and null durations for final events.

17. Coding questions · Thumbtack

    Estimate Two Conditional Win Probabilities by Simulation

    This question tests practical coding ability in probabilistic simulation, requiring implementation of a Monte Carlo method to estimate conditional win probabilities under two decision strategies. It assesses a data scientist's skill in translating a classic probability scenario into working randomized code rather than relying on closed-form analysis.

18. Coding questions · Instacart

    Evaluate an arithmetic expression

    This question evaluates a candidate's ability to implement expression parsing and evaluation, assessing competencies in string parsing, operator precedence, parentheses handling, and integer arithmetic semantics including truncation toward zero.

19. Coding questions · Aurora

    Evaluate an Arithmetic Expression

    Evaluate arithmetic expressions containing non-negative integers and the four basic operators without using eval. Preserve precedence and left associativity, implement division that truncates toward zero, and process expressions up to 300,000 characters efficiently.

20. Coding questions · Glean

    Evaluate an Integer Expression with + - * / and No Parentheses

    Evaluate an arithmetic expression string containing non-negative integers, plus, minus, times, integer division and spaces, but no parentheses, respecting operator precedence and left-to-right evaluation. Tests single-pass parsing, precedence handling and truncating integer division.

21. Coding questions · Snowflake

    Evaluate arithmetic expression with variables

    This question evaluates implementation skills for a linear-time expression parser and evaluator, covering tokenization, variable substitution, operator precedence and associativity (including unary +/−), parentheses handling, integer arithmetic semantics (division truncation), error detection, and adherence to O(L) time and space constraints.

22. Coding questions · Instacart

    Evaluate dependent variable expressions

    This question evaluates a candidate's ability to parse and evaluate assignment expressions, resolve inter-variable dependencies, and detect cycles or unsolvable references.

23. Coding questions · Rippling

    Evaluate Expense and Trip-Level Rules as Data

    Evaluate configurable expense and trip-sum rules using exact cents, reusable typed predicates, strict thresholds, multiple flags, and deterministic result ordering.

24. Coding questions · Amazon

    Evaluate IP Access Rules

    This question evaluates knowledge of IPv4 addressing, CIDR subnet matching, and access-control rule resolution, assessing competency in bitwise address reasoning, prefix-length precedence, and rule tie-breaking.