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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.
- 9403
- Questions
- 546
- Companies
- 11
- Topics
- 8
- Languages
Showing 1531–1560 of 1706 results
- 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 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 - 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 - 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 - UberMediumSoftware EngineerBuild a Quadtree and Analyze a Graph
This question evaluates skills in spatial data structures and recursive tree construction (building a quadtree) as well as graph analysis using traversal and cycle/safety detection to identify nodes that necessarily reach terminal nodes.
Coding & AlgorithmsTechnical Screen - UberMediumData ScientistCan one car serve all riders?
This problem tests your ability to determine if a single resource (a car) can accommodate a series of scheduled tasks without overlap, requiring efficient sorting and comparison techniques.
Coding & AlgorithmsTechnical ScreenSortingIntervalsGreedy - UberMediumData ScientistCompute CDF from a PDF Function
This problem tests your understanding of numerical integration techniques (specifically the trapezoidal rule) and your ability to implement a functional mapping of a continuous probability density function (PDF) into a discrete cumulative distribution function (CDF).
Coding & AlgorithmsTechnical ScreenNumerical MethodsProbabilityIntegration - UberMediumMachine Learning EngineerCompute currency conversion via graph search
This question evaluates graph modeling and pathfinding with weighted edges, numerical reasoning about multiplicative rates and floating-point precision, and the ability to analyze algorithmic time and space complexity.
Coding & AlgorithmsTechnical Screen - UberMediumData ScientistCompute maximum concurrent trips from intervals
This question evaluates a candidate's skill in designing efficient algorithms for interval overlap counting, including event ordering, handling half-open interval edge cases, and reasoning about concurrent activity timing.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerCompute outer boundary of an N-ary tree
This question evaluates proficiency in tree data structures and algorithm design, focusing on traversal and boundary extraction in ordered N-ary trees while requiring time and space complexity analysis.
Coding & AlgorithmsTechnical Screen - UberMediumData ScientistCompute square root to 1 decimal
This question evaluates a candidate's understanding of numerical methods, floating-point precision, and implementation of approximate functions when producing a square root rounded to one decimal place.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerCompute time for virus to infect grid
This question tests the ability to model state propagation in a 2D grid using a Breadth-First Search (BFS) approach to determine the minimum time required for a condition to cover all cells.
Coding & AlgorithmsTechnical ScreenBFSGraphGrid - UberMediumData ScientistConvert a PDF to a CDF
This question evaluates understanding of probability theory, numerical methods, and algorithmic implementation for converting probability density functions into cumulative distribution functions, addressing analytic versus sampled PDFs along with support, normalization, and monotonicity requirements.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerDeep Equality of Two Records
This problem tests your ability to recursively compare two complex, nested data structures while handling different types like dictionaries, lists, and primitives.
Coding & AlgorithmsTechnical ScreenRecursionData StructuresHash Maps - UberMediumData ScientistDesign airport dispatch with ETA uncertainty
This question evaluates proficiency in online algorithm design under uncertainty, stochastic modeling of ETAs, multi-objective optimization for resource allocation, and streaming data handling relevant to dispatch systems.
Coding & AlgorithmsTechnical Screen - UberHardSoftware EngineerDetermine Whether a Word Exists in a Character Grid
Practice a Uber coding interview problem focused on determine whether a word exists in a character grid. The prompt emphasizes edge cases, clean implementation, and verifiable test behavior without revealing the solution.
Coding & AlgorithmsTechnical Screen - UberEasySoftware EngineerFind Earliest Column With One
This question tests the ability to optimize searches in a sorted binary matrix by minimizing expensive API calls through efficient traversal techniques.
Coding & AlgorithmsTechnical ScreenBinary SearchOptimizationMatrix - UberMediumSoftware EngineerFind Earliest Full Connectivity Timestamp
This question evaluates understanding of graph connectivity and temporal event processing, examining how pairwise interactions over time can merge components into a single connected set.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerFind Kth Smallest in BST
This question evaluates understanding of binary search tree properties, ordered data retrieval, and algorithmic efficiency in locating the k-th smallest element.
Coding & AlgorithmsTechnical Screen - UberHardMachine Learning EngineerFind Robots by Nearest-Blocker Distances
Implement an algorithm to identify all robots in a grid whose four-directional distances to the nearest obstacle or grid boundary match a target query.
Coding & AlgorithmsTechnical Screenmatrixprefix-sumhash-table - UberMediumMachine Learning EngineerFind a Black-Box Convex Function Minimum
This question evaluates proficiency in zero-order optimization and algorithm design, focusing on reasoning about convexity and unimodality when only function evaluations are available.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerFind a Lexicographically Optimal Robot Path with Charging Cells
Find a path in a grid from start to target that lexicographically minimizes charging stations used, peak battery segment length, total moves, and breaks ties by flattened cell indices.
Coding & AlgorithmsTechnical ScreenGraphBFSShortest Path - UberMediumSoftware EngineerFind all dictionary words in a grid
This problem tests your ability to navigate a 2D grid using backtracking and optimize dictionary lookups using a Trie data structure.
Coding & AlgorithmsTechnical ScreenDFSBacktrackingTrie - UberHardSoftware EngineerFind cheapest flight with at most K stops
This question evaluates graph algorithm proficiency and problem-modeling skills, specifically working with directed weighted graphs to optimize path cost under a constraint on intermediate stops.
Coding & AlgorithmsTechnical Screen - UberMediumMachine Learning EngineerFind robots in a grid whose four-direction distances to blockers match a query
Given a grid of robots, blockers and empty cells plus a query of four distances, return every robot whose distances to the nearest blocker or grid edge going up, down, left and right match the query exactly. Tests precise distance definitions, boundary handling and scaling past a per-robot scan.
Coding & AlgorithmsTechnical Screen - UberHardSoftware EngineerFind robots matching obstacle-distance signature
This problem tests spatial reasoning, multi-source Breadth-First Search (BFS) for distance mapping, and pattern matching within 2D grids.
Coding & AlgorithmsTechnical ScreenBFSDynamic ProgrammingMatrix - UberMediumSoftware EngineerFind shortest jumps in circular array
This question evaluates graph-traversal and modular arithmetic skills by requiring modeling a circular array as a state graph and determining reachability and minimum-distance jumps under wrap-around constraints.
Coding & AlgorithmsTechnical Screen
Two Sigma
Uber