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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 1171–1200 of 1706 results
- PinterestMediumSoftware EngineerRemove and Compact a Parent-Index Forest
Tests tree traversal to find subtrees, array compaction, and index remapping on a parent-pointer forest representation without mutating input data.
Coding & AlgorithmsTechnical Screentreearraybfs - PinterestMediumSoftware EngineerRound numeric string values
This question evaluates parsing and numeric manipulation skills, specifically implementing rounding rules for numeric strings and handling decimals, significant digits, and precision edge cases.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerSelect the Nearest Eligible Elevator
Implement an elevator dispatch selection algorithm that finds the nearest eligible elevator for a passenger request based on floor, direction, and tie-breaking rules.
Coding & AlgorithmsTechnical Screenarrayssimulationgreedy - PinterestMediumSoftware EngineerSettle Group Expenses with Transfers
This question evaluates the ability to compute and reconcile per-person financial balances from transactional data and to translate net liabilities into direct transfers, exercising skills in numeric bookkeeping and data aggregation.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerSolve Multiple Coding Interview Problems
Tests breadth-first search and bipartite/dual-graph modeling to find the minimum number of transit lines needed to travel between two stops.
Coding & AlgorithmsTechnical ScreenGraphBFSHash Table - PinterestMediumSoftware EngineerSolve Two Grid Search Problems
This problem tests your ability to navigate 2D grids and apply graph traversal algorithms to identify connected components and calculate propagation distances.
Coding & AlgorithmsTechnical ScreenGraph TheoryBFSDFS - PinterestHardMachine Learning EngineerSolve a 9x9 Sudoku puzzle
This question evaluates algorithmic problem-solving skills focused on constraint satisfaction, state-space search, and implementation correctness for combinatorial puzzles.
Coding & AlgorithmsTechnical Screen - PlaidMediumSoftware EngineerCalculate Ordered Job Makespan Across Parallel Workers
Calculate the total makespan required to process a queue of ordered jobs across a fixed pool of identical parallel workers.
Coding & AlgorithmsTechnical ScreenHeapGreedySimulation - PlaidMediumSoftware EngineerCompute discounted prices in a queue
This question evaluates proficiency in array processing, algorithm design, use of auxiliary data structures such as monotonic stacks, and formal complexity and correctness reasoning.
Coding & AlgorithmsTechnical Screen - PlaidMediumSoftware EngineerCount Completed Jobs in a Serial Multi-Worker Pipeline
Calculate the total number of jobs completed by a given deadline across a multi-stage pipelined system with worker pools. The solution requires simulating stage-by-stage batch execution, tracking wave durations, and enforcing barrier synchronization between stages.
Coding & AlgorithmsTechnical ScreenSimulationDynamic ProgrammingQueue - PlaidMediumSoftware EngineerCount Completed Jobs in a Serial Single-Worker Pipeline
Determine the total number of jobs completed by a single worker executing a sequence of stage-gated tasks before a time limit expires. Tests linear simulation, division/modulo arithmetic, handling of zero-duration and zero-count edge cases, and 64-bit integer safety.
Coding & AlgorithmsTechnical ScreenSimulationMathGreedy - PlaidMediumSoftware EngineerDesign a coupon redemption system
This question evaluates proficiency in data structures and algorithms for building an in-memory service, including efficient lookup/update strategies, expiration handling, limit enforcement, idempotency, concurrency considerations, and time/space complexity reasoning.
Coding & AlgorithmsTechnical Screen - PlaidEasySoftware EngineerResolve routing-number to bank mapping
This question evaluates a candidate's skills in data normalization, deduplication, aggregation, and conflict resolution across multiple JSON data sources, with emphasis on canonicalization of aliases and handling inconsistent mappings.
Coding & AlgorithmsTechnical Screen - PlaidMediumSoftware EngineerValidate Evaluation Chains and Resolve Boolean Outcomes
Implement a graph traversal to resolve Boolean evaluation chains with negation, detecting cycles, paths leading to cycles, and undefined references in linear time.
Coding & AlgorithmsTechnical ScreenGraphDFSCycle Detection - PlaidMediumSoftware EngineerValidate and Resolve Chained Decision Rules
Determine if all rules in a chained decision rule set resolve to a terminal 'pass' outcome without cycles or missing references.
Coding & AlgorithmsTechnical ScreenGraphDFSCycle Detection - Point72MediumData ScientistClassify relationships for multiple circle pairs
This question evaluates computational geometry skills, careful integer arithmetic for numeric precision, case-based classification logic, and analysis of time and space complexity in the Coding & Algorithms domain for Data Scientist roles.
Coding & AlgorithmsTechnical Screen - Point72MediumData ScientistDetermine Circle Intersection Status for Rendering Order
This question evaluates geometric reasoning and computational-geometry competency, including spatial relationship analysis and handling numerical edge cases relevant to pairwise object interaction.
Coding & AlgorithmsTechnical Screen - Point72MediumQuantitative ResearcherFind the Minimum in a Rotated Sorted Array
A strictly increasing array of distinct integers has been rotated at an unknown pivot. Work through the function contract, boundary cases, correctness argument, and time and space complexity expected in a production-quality solution.
Coding & AlgorithmsTechnical Screen - Point72MediumMachine Learning EngineerFind the Smallest String After One Decrement
This question evaluates string manipulation, lexicographic ordering, and reasoning about local character transformations including wrap-around behavior.
Coding & AlgorithmsTechnical Screen - Point72HardData EngineerImplement Portfolio Trading Optimizer
This question evaluates algorithmic problem-solving, array processing, input validation via decorators, and the ability to produce concise transaction reports for maximizing non-overlapping buy/sell profits.
Coding & AlgorithmsTechnical Screen - Point72MediumData ScientistMaximize outfits with distinct colors
This question evaluates competency in combinatorial optimization and constrained resource-allocation algorithms, along with analysis of time and space complexity and robustness to skewed input distributions and edge cases.
Coding & AlgorithmsTechnical Screen - Pony.AiMediumSoftware EngineerImplement a Min-Heap with Insert and Remove-Min
Implement a binary min-heap from scratch using a zero-indexed array, supporting insertion, peek, and extraction of the minimum element in logarithmic time.
Coding & AlgorithmsTechnical ScreenHeapData StructuresBinary Heap - PurestorageMediumSoftware EngineerCount All-One Square Submatrices
Tests dynamic programming and 2D grid traversal skills by counting the total number of square submatrices filled entirely with ones.
Coding & AlgorithmsTechnical Screendynamic-programmingmatrixarrays - QualcommMediumSoftware EngineerCompute the Diameter of an Undirected Tree
Compute the diameter of a large undirected tree, measured by the number of edges on its longest simple path. The exercise tests adjacency construction, linear-time tree traversal, endpoint reasoning, recursion-depth awareness, and edge cases such as a single-node tree.
Coding & AlgorithmsTechnical Screen - QualcommMediumSoftware EngineerFind the First Bad Version in a Monotonic Release History
Find the earliest bad entry in a monotonic release history, returning -1 when every version is good. This compact coding prompt tests boundary-safe binary search, empty and all-good inputs, first-element failures, loop invariants, and logarithmic performance on histories with up to a million versions.
Coding & AlgorithmsTechnical Screen - QualcommMediumSoftware EngineerImplement A* Maze Search
This question evaluates proficiency in informed search algorithms, heuristic design (admissibility), grid-based graph traversal, path reconstruction, and time/space complexity analysis.
Coding & AlgorithmsTechnical Screen - Qube Research & TechnologiesHardSoftware EngineerCompute expected days until no whole pills
This problem tests your ability to model a stochastic process using a system of linear equations and solve it using expectation theory.
Coding & AlgorithmsTechnical ScreenProbabilityExpectationDynamic Programming - Qube Research & TechnologiesMediumSoftware EngineerImplement flat_map and design wealth redistribution
This question evaluates low-level data structure implementation skills (designing an associative flat_map with sorted dynamic array storage, unique-key semantics, iterator correctness and amortized complexity) alongside algorithmic optimization and proof-based reasoning for integer-constrained wealth redistribution.
Coding & AlgorithmsTechnical Screen - Qube Research & TechnologiesMediumSoftware EngineerImplement flat_map, redistribute wealth evenly
This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Implement flat_map, redistribute wealth evenly states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsTechnical Screen - QuoraMediumSoftware EngineerCount distinct palindromic subsequences
This question evaluates proficiency in string algorithms and combinatorial counting, focusing on recognition and enumeration of palindromic subsequences and techniques for deduplicating distinct results.
Coding & AlgorithmsTechnical Screen
Pinterest
Plaid
Point72
Qualcomm
Qube Research & Technologies