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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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Showing 2911–2940 of 3276 results
- Two SigmaHardData ScientistAssign 2n Workers to Two Tasks to Minimize Total Time
This question evaluates algorithmic problem-solving skills in combinatorial optimization and resource allocation, focusing on reasoning about cost differences when assigning 2n workers into two equal-sized tasks and belongs to the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - Two SigmaMediumSoftware EngineerAutoscale a Server Fleet from Throughput Readings
This question evaluates algorithmic implementation skills and numeric reasoning, focusing on stateful simulation of autoscaling behavior and capacity arithmetic under streaming throughput readings.
Coding & AlgorithmsTechnical Screen - Two SigmaMediumData ScientistCompute Piecewise Linear Interpolation
This question evaluates skills in algorithm design and numerical interpolation, including sorting and searching among 2D points, handling boundary cases for extrapolation, and computing linear interpolation accurately and efficiently.
Coding & AlgorithmsOnline Assessment - Two SigmaHardSoftware EngineerCompute maximum currency exchange rate
Compute maximum currency exchange rate 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 - Two SigmaHardData ScientistCount Distinct Island Shapes in a Binary Grid
This question evaluates a candidate's understanding of grid-based connected components and spatial equivalence, measuring competency in representing and distinguishing island shapes regardless of their location.
Coding & AlgorithmsOnsite - Two SigmaMediumData ScientistEvaluate Piecewise Linear Function
This question tests the ability to efficiently search through sorted interval data and apply linear interpolation to compute the value of a continuous piecewise function at a specific input point.
Coding & AlgorithmsOnline AssessmentBinary SearchInterpolationData Structures - Two SigmaMediumData ScientistEvaluate a Piecewise Linear Function
This question tests the ability to efficiently search through a sorted collection of coordinates and apply linear interpolation to compute values for a continuous piecewise function.
Coding & AlgorithmsOnline AssessmentBinary SearchInterpolationGeometry - Two SigmaMediumData ScientistEvaluate piecewise linear function at x
This question evaluates competency in numerical interpolation and handling of piecewise linear functions, including locating the correct segment in a sorted sequence of points and managing out-of-range inputs.
Coding & AlgorithmsOnline Assessment - Two SigmaHardData ScientistExpected Number of Good Pairs in a Randomly Weighted Complete Graph
This question evaluates probabilistic reasoning, combinatorics, and order-statistics intuition by asking for the expected count of mutual maximum-edge neighbors (good pairs) in an edge-weighted complete graph with i.i.d. continuous weights.
Coding & AlgorithmsTechnical Screen - Two SigmaEasyData ScientistFill Missing Time-Series Values with Linear Interpolation (Duplicate Timestamps Allowed)
This question evaluates a candidate's ability to perform time-series data cleaning and aggregation of duplicate timestamps, plus numerical linear interpolation and boundary value propagation, within the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - Two SigmaMediumSoftware EngineerImplement Price-Time Order Matching
Design and implement an in-memory limit order book matching engine supporting buy and sell orders with price-time priority (FIFO) and order cancellation.
Coding & AlgorithmsTechnical Screenheapdesignhash-table - Two SigmaHardData ScientistImplement Univariate Linear Regression with Ordinary Least Squares
This question evaluates understanding of univariate linear regression and the ordinary least squares (OLS) closed-form estimator, probing competencies in basic statistical estimation, interpretation of slope and intercept, numerical stability, and floating-point arithmetic.
Coding & AlgorithmsOnsite - Two SigmaMediumSoftware EngineerImplement a Hash Map with Separate Chaining and Resizing
This question evaluates understanding of hash table fundamentals, including hashing, separate chaining collision resolution, linked-list bucket management, dynamic resizing, and rehashing to maintain load factor and amortized performance.
Coding & AlgorithmsTechnical Screen - Two SigmaHardSoftware EngineerImplement an In-Memory Database
This question evaluates competence in implementing in-memory relational data structures, parsing tokenized database-like commands, and evaluating compound predicates with comparison operators.
Coding & AlgorithmsTechnical Screen - Two SigmaHardSoftware EngineerImplement binary encode/decode with frequency tree
This question evaluates understanding of frequency-based binary encoding and decoding, including deterministic tree construction, tie-breaking rules, and traversal, and tests knowledge of trees, priority queues, greedy algorithms, and bit-level string manipulation in the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - Two SigmaMediumData ScientistImplement merge sort and largest 1-rectangle
This question evaluates proficiency in implementing and analyzing classic algorithms, specifically merge sort for array sorting and techniques for computing the largest all-ones rectangular submatrix in a binary matrix, testing algorithmic thinking, data structure manipulation, and time/space complexity reasoning.
Coding & AlgorithmsTechnical Screen - Two SigmaMediumQuantitative ResearcherLinear Interpolator with Extrapolation
This question evaluates understanding of piecewise linear interpolation and extrapolation, numerical robustness with floating-point values, and algorithmic competencies such as sorting and efficient query location for large datasets.
Coding & AlgorithmsTechnical Screen - Two SigmaMediumSoftware EngineerMatch Limit Orders with Price-Time Priority
Implement a limit order matching engine adhering to price-time priority (FIFO), resting-order execution pricing, and partial fill mechanics.
Coding & AlgorithmsTechnical ScreenHeapData StructuresSimulation - Two SigmaEasyData ScientistMatch readings with latest same-city humidity
This question evaluates the ability to align and join time-ordered sensor data by key, testing skills in time-series merging, per-key state management, and handling absent matches.
Coding & AlgorithmsTechnical Screen - Two SigmaMediumSoftware EngineerMaximize Capital by Completing at Most k Projects
This question evaluates algorithmic problem-solving and optimization skills within the Coding & Algorithms domain, focusing on selection under resource and operation constraints and reasoning about time and space complexity.
Coding & AlgorithmsTechnical Screen - Two SigmaHardData ScientistMaximum-Product Simple Path in a Complete Directed Graph
This question evaluates skills in graph algorithms, multiplicative path optimization, and combinatorial dynamic programming, testing competency in reasoning about simple paths and product-based scoring in directed weighted graphs.
Coding & AlgorithmsOnsite - Two SigmaHardData ScientistMerge Two Sorted Lists
This problem tests your ability to manipulate linked list pointers to merge two sorted sequences efficiently without allocating extra space for new nodes.
Coding & AlgorithmsTechnical ScreenLinked ListsPointersRecursion - Two SigmaHardData ScientistMerge two sorted linked lists
This problem tests your ability to manipulate linked list pointers to merge two sorted structures in-place, focusing on space optimization and handling edge cases.
Coding & AlgorithmsTechnical ScreenLinked ListsPointersIn-place - Two SigmaMediumData ScientistReturn sorted values after quadratic transform
This problem tests your ability to efficiently transform elements in a sorted array using a quadratic function and merge them back into a single sorted array in linear time.
Coding & AlgorithmsTechnical ScreenArraysTwo PointersSorting - Two SigmaMediumSoftware EngineerSolve capital selection and grid escape
This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Solve capital selection and grid escape states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsOnsite - Two SigmaMediumMachine Learning EngineerSolve tree partition and IPO allocation
This question evaluates algorithmic problem-solving skills in tree processing and allocation simulations, specifically assessing understanding of subtree-sum computation for tree partitioning and deterministic round-robin allocation logic for IPO-style share distribution, along with appropriate data structure selection and correctness under edge cases. It is commonly asked in the Coding & Algorithms domain because it measures practical application-level implementation and the ability to analyze time and space complexity rather than purely conceptual proof.
Coding & AlgorithmsOnline Assessment - UberEasyMachine Learning EngineerAnalyze sales with groupby
This question evaluates proficiency in data manipulation and analytics using pandas, specifically the ability to join relational tables and apply groupby aggregations to compute business metrics like total sales, average sales per order, and completion rates.
Coding & AlgorithmsTechnical Screen - UberHardSoftware EngineerAnswer Repeated Shortest Increasing-Path Queries
Preprocess shortest strictly increasing grid paths for repeated target queries, with deterministic BFS ties, predecessor reconstruction, and memory trade-offs.
Coding & AlgorithmsOnsite - UberMediumSoftware EngineerAssign Meetings to the Minimum Number of Rooms
Assign meetings to the minimum number of rooms using deterministic room ID allocation, returning the room assigned to each meeting in original input order.
Coding & AlgorithmsOnsiteheapintervalssorting - UberMediumSoftware EngineerBracket substrings matching any pattern
This problem tests your ability to efficiently match and replace substrings based on a set of predefined patterns, prioritizing matches based on position and length.
Coding & AlgorithmsTechnical ScreenStringsGreedyPattern Matching
Two Sigma
Uber