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Software Engineer 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 1891–1920 of 2629 results
- PinterestMediumSoftware EngineerFewest Buses to Ride Between Two Stops on Looping Bus Lines
A coding problem about bus lines that loop through fixed lists of stops: find the fewest buses a rider must board to travel from a source stop to a target stop, or report that the target cannot be reached. It tests modeling transfers between lines as a graph and keeping the search efficient when many lines share stops.
Coding & AlgorithmsOnsite - PinterestMediumSoftware EngineerFind First Prefix-Matching Word
This problem tests your ability to efficiently search through a collection of strings to find the first element that satisfies a specific prefix condition, emphasizing clean iteration and edge case management.
Coding & AlgorithmsTechnical ScreenStringsArraysIteration - PinterestMediumSoftware EngineerFind minimum shuttle transfers
Find minimum shuttle transfers 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.
Coding & AlgorithmsOnline Assessment - PinterestMediumSoftware EngineerFind the Minimum Number of Coins for an Amount
Tests dynamic programming and breadth-first search techniques to find the minimum number of coin denominations required to reach a target value, including edge cases like zero and unreachable sums.
Coding & AlgorithmsOnsitedynamic-programmingbfsarrays - PinterestMediumSoftware EngineerImplement a min-heap column allocator
This question evaluates a candidate's competency in data structures (priority queues/min-heaps), online algorithm design for stream processing, and complexity and memory analysis.
Coding & AlgorithmsTechnical Screen - PinterestMediumSoftware EngineerImplement sparse matrix storage, addition, and multiplication
This problem tests your ability to design a memory-efficient representation for sparse matrices and implement arithmetic operations while leveraging the sparsity of the data.
Coding & AlgorithmsOnsiteArraysHash MapsLinear Algebra - PinterestMediumSoftware EngineerImplement stream line reader and settle balances
This question evaluates streaming I/O and buffered string-processing competency for Part 1 and transaction netting with balance computation for Part 2, covering skills in memory-bounded parsing, data-structure bookkeeping, and algorithmic flow reasoning.
Coding & AlgorithmsOnsite - PinterestMediumSoftware EngineerImplement string-based big integer multiplication
Implement multiplyStrings(a, b) to multiply two non-negative integers given as decimal strings, returning the product as a string without any big-integer or arbitrary-precision library. The solution covers grade-school O(n*m) long multiplication with linear memory, the Karatsuba and FFT/NTT scaling alternatives, correct carry and leading/trailing-zero handling, and a full edge-case test plan.
Coding & AlgorithmsOnsite - PinterestMediumSoftware EngineerInsert Operators to Reach a Target
Tests backtracking with operator precedence handling and operand formatting to construct all valid arithmetic expressions evaluating to a target value.
Coding & AlgorithmsOnsitebacktrackingrecursionstring - PinterestHardSoftware EngineerList All Plus/Times Expressions Reaching a Target Under Operator Precedence
Tests backtracking and state tracking with operator precedence to evaluate and enumerate arithmetic expressions using addition and multiplication.
Coding & AlgorithmsOnsiteBacktrackingRecursionMath - PinterestMediumSoftware EngineerList Unallocated Experiment Buckets
Determine all unassigned experiment bucket IDs in the range [0, total_buckets - 1] given lists of control and treatment bucket allocations.
Coding & AlgorithmsTechnical Screenarrayhash-tablebit-manipulation - PinterestMediumSoftware EngineerMark and Compact a Heap-Indexed Subtree
This problem tests array manipulation, heap-based tree traversal, and stable partitioning techniques while requiring memory efficiency without modifying the original input.
Coding & AlgorithmsOnline AssessmentArraysTreesHeap - PinterestMediumSoftware EngineerMinimum Transfers Between Pin Boards
Tests breadth-first search and graph modeling skills by finding the shortest path across overlapping collections without constructing a dense graph between every pair.
Coding & AlgorithmsOnsiteBFSGraphHash Map - PinterestMediumSoftware EngineerRebalance Experiment Buckets with Minimal Reassignment
Implement a deterministic rebalancing algorithm that redistributes entities among experiment buckets to meet exact target counts while minimizing reassignments and applying canonical tie-breaking.
Coding & AlgorithmsTechnical Screengreedysortinghash-map - PinterestMediumSoftware EngineerReconstruct an Itinerary from Flight Tickets
Tests graph modeling, depth-first search (DFS), and Hierholzer's algorithm to construct an Eulerian path with lexicographical tie-breaking.
Coding & AlgorithmsOnsiteGraphDFSEulerian Path - 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 - 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 - 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 - 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.
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