Coding & Algorithms interview questions

Showing 2401–2430 of 3276 results

• Per-IP Sliding-Window Rate Limiter: Accept or Reject Each RequestMedium

  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.

  RampSoftware EngineerCoding & AlgorithmsOnline Assessment
• Spreadsheet String Concatenation with Dependent CellsMedium

  Build a fixed-grid string spreadsheet with concatenation formulas, dependency updates, repeated references, and read-time circular-reference errors.

  RampSoftware EngineerCoding & AlgorithmsOnsite
• Track Users From Flight HistoryHard

  This question evaluates competency in processing and aggregating temporal event data, including time-interval reasoning, counting/grouping per user, and designing efficient data structures and algorithms for large datasets.

  RampSoftware EngineerCoding & AlgorithmsTechnical Screen
• Traverse an HTTP Maze with Retry HandlingHard

  This problem tests BFS traversal skills combined with state management for handling intermittent network failures and API constraints.

  RampSoftware EngineerCoding & AlgorithmsOnsite
• Process Operations for an In-Memory Key-Value StoreMedium

  This problem tests proficiency with hash map operations and handling data retrieval edge cases within an in-memory data store.

  RbcroyalbankMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Compare Sentences Using Transitive Synonym GroupsMedium

  Compare two tokenized sentences using undirected, transitive synonym relationships. Sentence lengths and word positions must match, while a union-find or graph traversal groups chained synonyms and leaves unknown words equivalent only to themselves.

  Read.AiSoftware EngineerCoding & AlgorithmsTechnical Screen
• Exclude Cat- or Dog-Related Comments and All Their Replies by Reader ModeMedium

  Given discussion comments that form reply trees, each flagged as being about cats, dogs, both or neither, return every comment a cat person or a dog person should not see, where hiding a comment also hides all of its replies. Tests reasoning over tree structure, edge cases such as missing parents, and complexity analysis.

  RedditMachine Learning EngineerCoding & AlgorithmsOnsite
• Find a Word Along One Fixed Direction in a GridMedium

  Search a letter grid for a word along one fixed direction, with explicit diagonal rules, boundaries, and rejection of paths that turn.

  RedditSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find word sequence with 1–2 char changesMedium

  This question evaluates graph traversal and shortest-path search skills, specifically reasoning about BFS vs DFS, string transformation modeling, and algorithmic time/space complexity within the Coding & Algorithms domain.

  RedditSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement a simplified memcached serverMedium

  This problem tests your ability to design a thread-safe, in-memory key-value store and implement basic command parsing for an asynchronous network service.

  RedditMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Implement a sliding-window rate limiterMedium

  This problem tests your ability to design a rate-limiting algorithm that calculates traffic volume within a sliding time window to prevent API abuse.

  RedditSoftware EngineerCoding & AlgorithmsOnsite
• Merge Message Context WindowsMedium

  This problem tests your ability to merge overlapping intervals efficiently using sorting and greedy techniques, a foundational skill for data reconciliation tasks.

  RedditSoftware EngineerCoding & AlgorithmsOnsite
• Moderator System with Ranking, Communities, and DemotionMedium

  Design and implement an in-memory moderator management system supporting community-specific hierarchies, seniority-based permissions, and rank mutations.

  RedditSoftware EngineerCoding & AlgorithmsTechnical Screen
• Solve palindrome and list tasksHard

  This problem tests your ability to manipulate string prefixes to satisfy palindromic properties and your skill in performing in-place linked list reordering based on node index parity.

  RedditMachine Learning EngineerCoding & AlgorithmsOnsite
• Check strings against dictionary efficientlyMedium

  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.

  ReevoSoftware EngineerCoding & AlgorithmsOnline Assessment
• Count all palindromic substringsMedium

  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.

  ReevoSoftware EngineerCoding & AlgorithmsOnline Assessment
• Compute minimum added stones to balance a treeMedium

  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.

  Reinforce LabsSoftware EngineerCoding & AlgorithmsOnline Assessment
• Compute transfers to balance account debtsEasy

  This question evaluates a candidate's ability to convert per-account net balances into a set of transfers, testing algorithmic problem solving, data-structure manipulation, and correctness under conservation invariants in transactional systems.

  RemitlySoftware EngineerCoding & AlgorithmsTechnical Screen
• Design an Elevator System and SchedulerMedium

  This question evaluates a candidate's object-oriented design and algorithmic scheduling competencies, focusing on concurrency control, fault tolerance, queue management, tie-breaking rules, and time/space complexity analysis within an elevator control system.

  RemitlySoftware EngineerCoding & AlgorithmsOnsite
• Solve k-Nearest Places by Latitude/LongitudeMedium

  This question evaluates geospatial algorithm and systems-design competencies, focusing on nearest-neighbor search, great-circle distance computation, spatial indexing, and runtime/memory trade-offs for scalable location queries.

  RemitlySoftware EngineerCoding & AlgorithmsOnsite
• Validate a Bijective Substitution CipherMedium

  Determine whether two printable ASCII strings form a valid one-to-one and onto (bijective) character substitution mapping.

  RemitlySoftware EngineerCoding & AlgorithmsOnsite
• Count Blocked Rate-Limited RequestsMedium

  This question evaluates understanding of rate-limiting logic, sliding-window time-based counting, and data structure design for tracking per-IP and per-(IP, host) request histories.

  RenderSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find the Five Busiest Client IPs in Request LogsMedium

  Aggregate completed HTTP request logs across files to find the top five client IPv4 addresses, excluding auxiliary messages and applying deterministic count ties.

  RenderSoftware EngineerCoding & AlgorithmsTechnical Screen
• Evaluate a Small Stack-Based Integer LanguageEasy

  Implement an interpreter for a stack-based integer language supporting arithmetic, stack manipulation, output, and immediate error reporting with partial output preservation.

  Retell AISoftware EngineerCoding & AlgorithmsTechnical Screen
• Query an Indexed In-Memory Numeric TableMedium

  This problem tests the ability to implement efficient multi-column indexing using binary search and sorted set intersections to handle complex range queries.

  Retell AISoftware EngineerCoding & AlgorithmsTechnical Screen
• Compute max profit with forced tradesMedium

  Compute max profit with forced trades 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.

  RetoolSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement a random fixed-size load balancerMedium

  This question evaluates understanding of randomized selection, efficient in-memory data structures, and API/state management for a fixed-capacity load balancer that must support addNode, removeNode, and uniform random routing while handling duplicates, removals, and empty-state behavior.

  RevolutSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement a thread-safe money transferMedium

  This question evaluates a candidate's mastery of concurrent programming and data-integrity principles, focusing on thread safety, atomic state updates, and deadlock avoidance when transferring funds between shared accounts.

  RevolutSoftware EngineerCoding & AlgorithmsTechnical Screen
• Distribute Annual Revenue Across Twelve MonthsMedium

  This problem tests logic, integer arithmetic, and edge-case handling by requiring the distribution of a total sum into equal parts while managing remainders without using floating-point numbers.

  RilletBackend EngineerCoding & AlgorithmsTechnical Screen
• Aggregate Letter-Number GroupsEasy

  This problem tests string parsing, data aggregation using a hash map, and sorting techniques.

  RiotgamesSoftware EngineerCoding & AlgorithmsTechnical Screen