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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 2341–2370 of 3276 results
- PinterestMediumSoftware EngineerReconstruct itinerary with lexicographic ties
This question evaluates a candidate's ability to model and traverse directed graphs with repeated edges, enforce lexicographic ordering among possible paths, and analyze time and space complexity for an algorithmic solution.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerReconstruct route from unordered travel tickets
This problem tests your ability to model a graph where each edge represents a transition, requiring you to find a valid linear sequence that visits every node exactly once.
Coding & AlgorithmsOnsiteGraphsHash MapLinked List - 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 EngineerSettle debts with minimal transactions
Pinterest software-engineer onsite coding question: given a list of debts as (debtor, creditor, amount) triples, return settlement transfers that clear every net balance using the minimum number of transactions. It tests reducing to net balances, recognizing the problem is NP-hard, backtracking with pruning to find the optimum for small N, and a heap-based greedy heuristic plus correctness and time/space complexity analysis for large, skewed debt graphs.
Coding & AlgorithmsOnsite - PinterestMediumMachine Learning EngineerSolve Expression and Tree-List Problems
This problem tests recursive backtracking for expression generation and pointer manipulation for in-place tree-to-linked-list conversion.
Coding & AlgorithmsOnsiteBacktrackingTreesLinked Lists - PinterestMediumSoftware EngineerSolve Four Interview Coding Problems
This set tests proficiency in graph algorithms, binary search on sorted data, grid simulations, and custom data structure design for real-time leaderboards.
Coding & AlgorithmsOnsiteGraphsBinary SearchSimulation - 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 - PinterestMediumMachine Learning EngineerSolve five hard algorithm problems
This problem tests your ability to optimize range-based operations using a difference array or prefix sum strategy and demonstrates your skill in balancing computational efficiency with memory constraints.
Coding & AlgorithmsOnsiteArraysPrefix SumDifference Array - PinterestMediumMachine Learning EngineerSolve prefix, array, and string problems
This problem tests your ability to efficiently manage prefix-based string searching using a Trie data structure, specifically focusing on handling wildcard character matching.
Coding & AlgorithmsOnsiteTrieStringRecursion - PinterestMediumSoftware EngineerSolve set equality and ad log top‑K
This multi-part question evaluates set and multiset operations, frequency counting, top-K computation over time windows, sliding-window and streaming data structures, and character-multiset matching for string construction within the coding & algorithms domain.
Coding & AlgorithmsOnsite - PinterestHardMachine Learning EngineerSupport room moves and query top-k fastest
This problem tests your ability to design a data structure that efficiently manages room assignments and retrieves the top-k rooms based on a primary priority (number of people) and a secondary priority (earliest arrival time).
Coding & AlgorithmsOnsiteData StructuresHeapHash Map - PitchbookEasySoftware EngineerImplement Euclidean distance and k-nearest neighbors
This question evaluates understanding of Euclidean distance metrics, vector arithmetic, and nearest-neighbor retrieval, testing implementation skills for computing distances and selecting the k closest points.
Coding & AlgorithmsOnsite - 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 - 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 - 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
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