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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.
- 9403
- Questions
- 546
- Companies
- 11
- Topics
- 8
- Languages
Showing 511–540 of 781 results
- OptiverMediumSoftware EngineerPlan for timed probability assessment
This question evaluates rapid probabilistic and statistical reasoning, time management and problem prioritization under strict timing, along with the ability to adapt approaches based on scoring rules and calculator restrictions, and it is classified in the Statistics & Math domain.
Statistics & MathOnline Assessment - OptiverMediumQuantitative TraderSolve a Skyscraper puzzle efficiently
This question evaluates understanding of constraint satisfaction and combinatorial search, testing competency in modeling Latin-square domains with visibility constraints, pruning and uniqueness verification, and algorithmic complexity analysis.
Coding & AlgorithmsOnline Assessment - OptiverMediumSoftware EngineerSolve numeric sequence pattern puzzles
This question evaluates pattern recognition and quantitative reasoning skills, requiring identification of numeric relationships, series properties, and simple number-theoretic or arithmetic transformations.
Statistics & MathOnline Assessment - OptiverHardData ScientistSolve probability and expectation problems
This problem tests your ability to calculate expected stopping times in a discrete random walk and your understanding of conditional expectation and symmetry in probability.
Statistics & MathOnline AssessmentProbabilityExpectationStochastic Processes - OptiverMediumSoftware EngineerSolve quick probability questions
This set evaluates core probability and combinatorics skills including discrete distributions, conditional probability, independence, expectation and variance, and basic stochastic processes such as gambler's ruin, situated in the Statistics & Math domain.
Statistics & MathOnline Assessment - OptiverMediumSoftware EngineerValidate a Binary Tree Built from Directed Edges
This question evaluates understanding of tree and graph fundamentals including parent-child constraints, duplicate-edge detection, cycle detection, node-degree limits, and in-order traversal semantics.
Coding & AlgorithmsOnline Assessment - OtherEasySoftware EngineerClean up all Docker resources
This question evaluates proficiency in Docker resource management, covering containers, images, and volumes and the ability to perform a complete environment cleanup.
Software Engineering FundamentalsOnline Assessment - OtherMediumSoftware EngineerCompute total after discounting most expensive item
This question evaluates array manipulation and numeric computation skills—specifically identifying the maximum element, applying a percentage discount, and correctly handling fractional results and flooring—within the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - OtherEasySoftware EngineerCount Failing, Passing and Distinction Scores from Percentage Thresholds
Given an array of student exam scores as percentages, count how many students failed with under 50, passed with 50 to 80 inclusive, or passed with distinction above 80, and return the three counts in order. It tests careful handling of inclusive and exclusive boundaries and empty input.
Coding & AlgorithmsOnline Assessment - OtherMediumSoftware EngineerCount Grid Paths Without Three Consecutive Moves
Count monotone grid paths that use exact numbers of right and up moves without ever taking three identical moves in a row. Address empty and one-direction paths, return an exact count, and explain how the limits affect time and space costs.
Coding & AlgorithmsOnline Assessment - OtherEasySoftware EngineerFewest 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.
Coding & AlgorithmsOnline Assessment - OtherEasySoftware EngineerLowest Common Ancestor in an Explicit Binary Tree
Find the lowest common ancestor in a binary tree using explicit child arrays, including identical targets, ancestor targets, and deep trees.
Coding & AlgorithmsOnline Assessment - OtherMediumSoftware EngineerReturn the k-th row of Pascal-like triangle
This question evaluates combinatorics, array manipulation, and space-efficient algorithm design by requiring computation of a specific row of Pascal’s triangle without constructing the full triangle.
Coding & AlgorithmsOnline Assessment - OtherMediumSoftware EngineerSolve a Set of Probability and Quantitative Reasoning Problems
Work through fourteen quantitative interview problems covering probability, counting, expectation, algebra, logical constraints, and rate reasoning. Each result should be auditable, use the correct sample space, and state any interpretation that affects the calculation.
Statistics & MathOnline Assessment - OtherEasySoftware EngineerTrack Workers, Sessions, Promotions, and Bonus Pay
Implement worker sessions, current metadata, promotions, ordered filtering, and time-clipped compensation with historical rates and non-stacking double-pay intervals.
Coding & AlgorithmsOnline Assessment - OtherEasySoftware EngineerValidate Nested Parentheses, Brackets, and Braces
Validate nested parentheses, brackets, and braces with correct handling of empty input, mismatched closing symbols, and unfinished groups.
Coding & AlgorithmsOnline Assessment - OtherMediumData ScientistWrite SQL to analyze response accuracy and speed
This question evaluates proficiency with SQL-based data manipulation and analytical querying on relational assessment data, including aggregation, grouping, joins, windowed ranking, and use of PostgreSQL statistical functions to analyze accuracy and response-time metrics.
Data Manipulation (SQL/Python)Online Assessment - OthersEasyData ScientistAnswer ancestor-walk queries on a rooted tree
This question evaluates understanding of tree data structures and ancestor-walk queries, assessing competency in traversing rooted trees, interpreting parent arrays, and designing efficient query-processing methods for large n and q.
Coding & AlgorithmsOnline Assessment - OthersMediumSoftware EngineerAnswer k-step ancestor queries in a rooted tree
This problem tests your ability to optimize ancestor lookups in a tree using the Binary Lifting technique to achieve logarithmic query time.
Coding & AlgorithmsOnline AssessmentTreesBinary LiftingDynamic Programming - OthersEasyData ScientistCompute per-coin quarterly amounts and totals
This question evaluates competence in SQL data manipulation—specifically time-based conditional aggregation, grouping, joins, and handling entities with no activity—to compute per-coin quarterly sums and year-to-date totals.
Data Manipulation (SQL/Python)Online Assessment - OthersMediumSoftware EngineerWrite a quarterly SQL report and a bash max-file script
This problem tests your ability to perform conditional aggregation in SQL for time-series reporting and your proficiency in recursive shell scripting for system administration tasks.
Software Engineering FundamentalsOnline AssessmentSQLBashData Aggregation - OuraMediumSoftware EngineerImplement Server Number Allocation
This problem tests your ability to manage and reuse resources efficiently using data structures that allow for logarithmic time allocation and deallocation within partitioned namespaces.
Coding & AlgorithmsOnline AssessmentData StructuresHeapHash Map - PalantirMediumSoftware EngineerApply Item Coupons with Exact Per-Item Cent Rounding
Implement a checkout calculation engine that applies item-specific coupons to cart lines using exact banker's rounding (round-half-to-even) per unit and returns the final cart total in integer cents.
Coding & AlgorithmsOnline AssessmentSimulationData StructuresMath - PalantirMediumSoftware EngineerOptimize Coupon Selection Under a Twenty-Point Budget
Optimize coupon activations under a 20-point budget to maximize monetary savings while handling item/category stacking, savings caps, rounding, and tie-breaking.
Software Engineering FundamentalsOnline AssessmentAlgorithmsDynamic ProgrammingBit Manipulation - PalantirMediumSoftware EngineerStack Item and Category Coupons with an Eighty-Percent Cap
Implement a cart checkout calculator that stacks item and category discounts multiplicatively, caps savings at 80%, and applies round-half-up once per item.
Coding & AlgorithmsOnline AssessmentImplementationMathSimulation - PerplexityMediumSoftware EngineerImplement time-versioned KV store with restore
This question evaluates a candidate's ability to design and implement a time-versioned key–value store, assessing knowledge of temporal data structures, versioning semantics, time-travel and range queries, deletion semantics, and rollback/restoration.
Coding & AlgorithmsOnline Assessment - PersonaHardSoftware EngineerImplement a Versioned Key-Value File Store
Practice a Persona coding interview problem focused on implement a versioned key-value file store. The prompt emphasizes edge cases, clean implementation, and verifiable test behavior without revealing the solution.
Coding & AlgorithmsOnline Assessment - PikaMediumSoftware EngineerImplement text formatter and sum subarray products
This question evaluates algorithmic problem-solving and implementation skills across string formatting (line breaking and space management) and array-based combinatorial computation (sum of subarray products), emphasizing correctness, edge-case handling, and analysis of time and space complexity.
Coding & AlgorithmsOnline Assessment - PinterestHardMachine Learning EngineerAnswer core ML fundamentals questions
This question evaluates a candidate's mastery of core Machine Learning fundamentals, including classification metrics (precision and recall) with confusion-matrix interpretation, gradient concepts for optimization, ensemble learning tradeoffs, and the mechanics of a neural network forward pass.
Machine LearningOnline Assessment - PinterestMediumSoftware EngineerCollect Pins from Reachable Boards
Implement a breadth-first graph traversal over a collection of boards to collect unique pins in discovery order, handling cycles, shared children, and invalid references.
Coding & AlgorithmsOnline AssessmentGraphBFSHash Table
Optiver
Palantir
Perplexity
Pinterest