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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 301–330 of 427 results
- Point72EasyData ScientistFind kth missing integer and redundant operations
This paired question evaluates array and algorithmic skills — specifically order-statistics and missing-number reasoning for the k-th missing positive, and time-window aggregation with frequency tracking for detecting redundant log events — within the coding & algorithms domain.
Coding & AlgorithmsOnline Assessment - Point72HardData EngineerImplement Election Report and Banking Pipeline
This multipart question evaluates data engineering competencies including SQL report design for complex aggregation and ranking, plus PySpark-based ETL and transaction-level analytics.
Coding & AlgorithmsOnline Assessment - Point72HardData ScientistImplement composition and mixin utilities
This problem tests proficiency in functional composition, Python metaclass/decorator patterns, and custom serialization logic, focusing on handling flexible arguments and object introspection.
Coding & AlgorithmsOnline AssessmentPythonFunctional ProgrammingSerialization - Point72HardSoftware EngineerMaximize Fixed Positions After Deletions
This problem tests your ability to use dynamic programming and data structures to maximize elements in a subsequence that align with their new indices after removing elements.
Coding & AlgorithmsOnline AssessmentDynamic ProgrammingGreedyData Structures - Point72HardSoftware EngineerSimulate a Deterministic Finite Automaton
Implement and run a Deterministic Finite Automaton (DFA) simulator that parses state transitions over a binary alphabet and determines if input strings are accepted.
Coding & AlgorithmsOnline AssessmentFinite AutomataState MachineDesign - Point72EasyData EngineerSolve SQL and PySpark Data Tasks
This question tests your ability to handle data cleaning, filtering, and aggregation using both SQL and PySpark syntax on a transaction dataset.
Coding & AlgorithmsOnline AssessmentSQLPySparkData-Cleaning - QuinceMediumSoftware EngineerCheck Whether a Word Repeated K Times Is a Subsequence
This problem tests the ability to optimize string pattern matching by using modular arithmetic and pointer manipulation to avoid unnecessary memory allocation.
Coding & AlgorithmsOnline AssessmentStringsTwo PointersGreedy - QuinceMediumSoftware EngineerOpen the Minimum Number of Sprinklers to Cover a Garden
This problem tests greedy algorithm design and interval scheduling techniques to solve a coverage optimization task.
Coding & AlgorithmsOnline AssessmentGreedyIntervalsSorting - RampMediumSoftware EngineerImplement a multi-level digital recipe manager
Tests skills in data modeling and stateful class implementation, covering CRUD operations, case-insensitive string handling, recipe ID generation, list management, search and sort logic, and basic user/edit permissions.
Coding & AlgorithmsOnline Assessment - RampMediumSoftware EngineerImplement multi-level task manager APIs
This question evaluates implementation skills for stateful in-memory data structures, API evolution handling, substring search and prioritized sorting, and time-windowed assignment logic with quota enforcement in the Coding & Algorithms domain, and is primarily a practical application problem rather than a purely conceptual one.
Coding & AlgorithmsOnline Assessment - RampMediumSoftware EngineerMaximize Earnings by Converting Days Off into Workdays
This question evaluates a candidate's skill in dynamic programming and constrained optimization, specifically deciding which state transitions to modify under a limited budget of changes. It falls under coding and algorithms interviews, testing practical application of greedy or DP reasoning over sequential data with adjacency-based bonuses rather than pure conceptual knowledge.
Coding & AlgorithmsOnline Assessment - RampMediumSoftware EngineerMaximum Profit from Dated Stock Trade Records
This question evaluates a candidate's ability to design an efficient single-pass algorithm for grouped time-series data, tracking per-symbol running minimums to compute maximum achievable profit. It tests array processing, hash-map grouping, and edge-case handling for unsorted records, commonly used in coding interviews to assess practical algorithmic problem-solving rather than pure theory.
Coding & AlgorithmsOnline Assessment - RampMediumSoftware EngineerMaximum Profit from Multi-Stock Trading Records
This question evaluates a candidate's ability to parse and sort unstructured event data, then apply a greedy or dynamic-programming strategy for maximizing profit across multiple independent series. It falls under coding and algorithms, commonly used to assess array processing, state tracking, and stock-trading pattern recognition at a practical implementation level.
Coding & AlgorithmsOnline Assessment - RampMediumSoftware EngineerMulti-Level Warehouse Storage with Weighted Retrieval
This question evaluates a candidate's ability to design an object-oriented data structure with multiple prioritized eviction and expiration rules. It tests skills in coding and algorithms, specifically simulating TTL-based expiry alongside tiered, capacity-aware selection logic. Such multi-rule state machine problems are common in interviews to assess careful requirement tracking and practical implementation of layered constraints.
Coding & AlgorithmsOnline Assessment - RampMediumSoftware EngineerPer-IP Sliding-Window Rate Limiter: Accept or Reject Each Request
Implement a per-IP sliding-window rate limiter: given request timestamps, IP addresses, a request limit and a window length, decide in order whether each request is accepted or rejected. Tests exact window-boundary semantics, per-IP state, and processing a request log efficiently.
Coding & AlgorithmsOnline Assessment - ReevoMediumSoftware EngineerCheck strings against dictionary efficiently
This question evaluates skills in efficient membership testing for large datasets, memory-time trade-offs in data structures, and string handling concerns such as case sensitivity and Unicode normalization.
Coding & AlgorithmsOnline Assessment - ReevoMediumSoftware EngineerCount all palindromic substrings
This question evaluates proficiency with string algorithms and algorithmic problem-solving, focusing on palindrome detection and counting contiguous substrings. It is commonly asked to assess implementation skills and the ability to reason about time and space complexity within the Coding & Algorithms domain, emphasizing practical application rather than purely conceptual understanding.
Coding & AlgorithmsOnline Assessment - Reinforce LabsMediumSoftware EngineerCompute minimum added stones to balance a tree
This problem tests tree traversal techniques and greedy aggregation, requiring you to determine the minimum number of 'stones' needed to equalize all subtree sums to match a target value.
Coding & AlgorithmsOnline AssessmentTreesGreedyRecursion - RipplingMediumSoftware EngineerFind bounding boxes of connected houses
This problem tests your ability to perform graph traversal (BFS/DFS) on a 2D grid to identify distinct connected components and compute their spatial extent.
Coding & AlgorithmsOnline AssessmentGraphsDFSBFS - RobloxMediumSoftware EngineerData Center Rack Units: Can a Centered Equipment Bay Be Reserved?
Process an online stream of rack-unit reservations and span-availability checks over an infinite 1D coordinate line, answering each availability check with the data seen so far.
Coding & AlgorithmsOnline Assessmentbinary-searchonline-queriesarrays - RobloxMediumSoftware EngineerFind the Longest Safe Straight-Line Movement on a Laser Grid
Find a robot's longest safe straight-line movement on a laser-covered grid, where only the initial cell is protected and laser rows and columns are blocked.
Coding & AlgorithmsOnline Assessment - RobloxEasyData ScientistImplement four DS coding tasks
This multi-part question evaluates a data scientist's competencies in statistical inference (sample size and z-test calculations), causal inference and parallel-trends validation (difference-in-differences), Bayesian probability updating, and interpretable supervised learning feature importance, all framed as coding tasks.
Coding & AlgorithmsOnline Assessment - RobloxMediumSoftware EngineerNumber Line Obstacles: Check Whether a Centered Block Can Be Built
Process operations on an infinite integer number line that either place an obstacle or ask whether a block centered at a point, reaching a given distance in each direction, is free of obstacles, and return the answers as a binary string. It tests efficient online range queries over large, sparse coordinates.
Coding & AlgorithmsOnline Assessment - RobloxMediumData ScientistOptimize assembly-line scheduling with changeovers
This question evaluates combinatorial optimization and scheduling competencies, specifically reasoning about NP-hardness, sequence-dependent setup times, precedence and downtime constraints, and designing exact and heuristic solvers for makespan minimization.
Coding & AlgorithmsOnline Assessment - RobloxMediumSoftware EngineerTrail Campsite Clearance: Online Pin and Range-Empty Queries
Process a stream of events that drop hazard pins at integer mile markers or ask whether a campsite centered at a marker with a given radius would be hazard-free, returning the answers as a string. Tests sparse-coordinate range counting with binary search and a Fenwick tree.
Coding & AlgorithmsOnline Assessmentfenwick-treecoordinate-compressionbinary-search - RubrikHardSoftware EngineerFind largest connected group of overlapping intervals
This question evaluates understanding of interval overlap modeling, graph connectivity, and algorithmic efficiency by requiring mapping time intervals to an undirected communication graph and identifying its largest connected component.
Coding & AlgorithmsOnline Assessment - RubrikHardSoftware EngineerValidate BFS order queries on a tree
This question evaluates understanding of BFS traversal, tree graph representation, and the ability to reason about allowable dequeue/enqueue orderings in a FIFO queue.
Coding & AlgorithmsOnline Assessment - SIG (Susquehanna)MediumSoftware EngineerCount Equal-Difference Triples After Each Add or Remove-All Operation
Process a stream of add-one and remove-all operations on a multiset and report, after each operation, how many element triples form an arithmetic progression with a fixed positive difference. It tests efficient incremental updates, correct treatment of duplicate occurrences, and counts that exceed the 32-bit range.
Coding & AlgorithmsOnline Assessment - SIG (Susquehanna)MediumSoftware EngineerCount subarrays with odd zero count
This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Count subarrays with odd zero count states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsOnline Assessment - SIG (Susquehanna)MediumSoftware EngineerRotate a Square Matrix Clockwise While Both Diagonals Stay Fixed
Rotate every element of a square matrix that lies off both diagonals by 90 degrees clockwise a given number of times, leaving the main-diagonal and anti-diagonal values in place. It tests precise index mapping, handling of odd and even matrix sizes, and bug-free simulation under timed assessment conditions.
Coding & AlgorithmsOnline Assessment
Point72
Ramp
Rippling
Roblox
Rubrik
SIG (Susquehanna)