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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.
- 9403
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- 546
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- 11
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- 8
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Showing 331–360 of 427 results
- SalesforceMediumSoftware EngineerConvert integer to NAF form
This question evaluates understanding of number representations (Non-Adjacent Form), bit-level optimization, and formal proof techniques for demonstrating minimal Hamming weight, together with algorithmic complexity analysis.
Coding & AlgorithmsOnline Assessment - SalesforceMediumSoftware EngineerDelete One Character Type to Minimize Unique Segments
Determine which single character type to delete from a string so that greedily partitioning the remaining characters into substrings with all-unique characters yields the minimum number of segments.
Coding & AlgorithmsOnline Assessmentgreedystringhash-table - SalesforceMediumSoftware EngineerDetermine minimal substitutions and removals
This question evaluates string manipulation and adjacency-constraint handling in the first task and sequence analysis with minimal-removal and subsequence reasoning in the second, targeting competencies such as local transformation logic, subsequence recognition, and optimization under input constraints.
Coding & AlgorithmsOnline Assessment - SalesforceMediumSoftware EngineerFewest Add-or-Subtract Power-of-Two Steps to Reduce n to Zero
An integer problem: reduce a positive n to zero with the fewest operations, where each operation adds or subtracts a power of two. It tests reasoning about binary representations, proving a strategy optimal, and working safely with integers larger than 32 bits.
Coding & AlgorithmsOnline Assessment - SalesforceMediumSoftware EngineerFewest Repeat-Free Pieces After Deleting Every Copy of One Letter
A string problem: delete every occurrence of one chosen lowercase letter, then split what remains into the fewest contiguous pieces with no repeated letters. It tests reasoning about optimal partitions, evaluating every deletion choice efficiently, and edge cases on strings up to 200,000 characters.
Coding & AlgorithmsOnline Assessment - SalesforceEasySoftware EngineerRemove duplicates and find constrained longest subsequence
This problem tests your ability to manipulate linked structures to remove duplicates and your algorithmic efficiency in finding the longest string that satisfies two distinct containment constraints.
Coding & AlgorithmsOnline AssessmentLinked ListStringsSubsequence - SalesforceMediumSoftware EngineerSolve Two OA Coding Problems
These two problems evaluate in-place array manipulation and run-length encoding implementation for character sequences, and algorithmic reasoning about integer operations and minimal-operation sequences, falling squarely within the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - SchonfeldMediumData ScientistCompute probability last passenger gets own seat
This question evaluates a candidate's understanding of probability theory, combinatorics, and reasoning about sequential random processes, with emphasis on symmetry and conditional dependence.
Coding & AlgorithmsOnline Assessment - SchonfeldMediumData ScientistFind smallest N for 5-and-21 sums
This question evaluates understanding of integer linear combinations and elementary number theory, framed as a Frobenius coin problem that examines representability using non-negative multiples of 5 and 21.
Coding & AlgorithmsOnline Assessment - SnapchatMediumSoftware EngineerCompute shortest recursive string encoding
This question evaluates proficiency in string manipulation, pattern detection, recursion, and dynamic programming for efficient sequence compression in the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - SnowflakeMediumSoftware EngineerSolve Array Distance and Wiki Navigation
This question evaluates array-processing and graph-algorithm skills, specifically minimum-distance computation between marked elements in a one-dimensional array and shortest-path navigation in a directed link graph, plus edge-case reasoning and test-case design.
Coding & AlgorithmsOnline Assessment - SquarepointMediumData ScientistMaximize revenue from inventory sales
This question evaluates algorithmic problem-solving and optimization competencies focused on dynamic resource allocation, revenue maximization, and designing efficient solutions that scale with large n, m, and quantities.
Coding & AlgorithmsOnline Assessment - SquarepointMediumSoftware EngineerParse payroll file and answer queries
This question evaluates proficiency in robust file parsing, schema-driven data modeling, type conversion, validation, duplicate handling, and implementing aggregate and ranking queries using Python's standard library for messy, delimited payroll data.
Coding & AlgorithmsOnline Assessment - SquarepointHardSoftware EngineerSolve two coding assessment tasks
This question set evaluates algorithmic optimization and string-processing skills: the first problem focuses on maximizing cumulative revenue from limited inventories (optimization and greedy reasoning with dynamic value updates), while the second focuses on case-insensitive text parsing, word frequency counting, and frequency-based ordering.
Coding & AlgorithmsOnline Assessment - StripeHardSoftware EngineerCalculate Per-User Usage Charges
This problem tests your ability to efficiently process and aggregate time-series usage data while handling complex proration rules and tiered pricing models.
Coding & AlgorithmsOnline AssessmentArraysSortingMath - StripeHardSoftware EngineerFind Weekly Deployment Windows Across Time Zones
Determine the first k non-overlapping deployment windows across a 3-week search horizon by mapping weekly recurring local allow and freeze rules into a repeating UTC timeline.
Coding & AlgorithmsOnline AssessmentIntervalsPrefix SumSliding Window - StripeMediumSoftware EngineerImplement a Datacenter Request Router
This problem tests the ability to manage stateful datacenter metadata and implement a routing algorithm that prioritizes proximity (Haversine distance) while respecting capacity constraints.
Coding & AlgorithmsOnline AssessmentGeometryHash MapSorting - StripeMediumSoftware EngineerImplement bitmap font render/compress/invert
This problem tests your ability to manipulate 2D bit arrays, implement Run-Length Encoding (RLE) for data compression, and perform grid-based coordinate transformations.
Coding & AlgorithmsOnline AssessmentArraysStringsCompression - StripeMediumSoftware EngineerImplement multi-network card validator with Luhn
This question evaluates a candidate's ability to implement and reason about the Luhn checksum, multi-network payment card format validation, combinatorial completion for redacted digits, single-error correction models, and efficient search/pruning with deterministic duplicate avoidance.
Coding & AlgorithmsOnline Assessment - StripeEasySoftware EngineerImplement stateful connection router simulator
This question evaluates design and implementation skills for a stateful connection router, focusing on round-robin load distribution, connection lifecycle handling (duplicate connects, disconnects, shutdowns), and per-target capacity and mapping management.
Coding & AlgorithmsOnline Assessment - StripeMediumSoftware EngineerRegister Data Centers and Route to the Nearest Healthy Region
Implement a stateful command processor to register data centers, update their operational health, and route incoming requests to the nearest healthy data center using the Haversine distance formula.
Coding & AlgorithmsOnline AssessmentDesignGeometryParsing - StripeHardSoftware EngineerSubtract Blocked Periods from Allowed Deployment Windows
Compute available deployment windows by merging allowed and blocked half-open intervals, subtracting overlaps, and returning maximal sorted nonempty ranges.
Coding & AlgorithmsOnline Assessment - TargetMediumBackend EngineerFind the Closest Candidate String by Edit Distance
This problem tests the implementation of the Levenshtein distance algorithm (Edit Distance) and the ability to manage tie-breaking logic when comparing multiple strings against a query.
Coding & AlgorithmsOnline AssessmentDynamic ProgrammingStringsOptimization - TeslaEasySoftware EngineerGenerate Per-Position Guess Feedback
This problem tests your ability to process strings and manage state (character frequency) to determine exact matches versus partial matches, commonly used in word-guessing games.
Coding & AlgorithmsOnline AssessmentStringHash MapArray - The Trade DeskMediumSoftware EngineerImplement a Cloud Storage Service
This question evaluates a candidate's ability to implement an in-memory cloud storage system, exercising skills in data structures and stateful API design, string handling and pattern matching, sorting and eviction algorithms, and per-user resource accounting.
Coding & AlgorithmsOnline Assessment - TikTokHardMachine Learning EngineerImplement local maxima, bagging, and k-means
This problem tests your ability to implement a sliding window peak detector, a bootstrapping ensemble sampler, and a centroid-based clustering algorithm from scratch.
Coding & AlgorithmsOnline AssessmentAlgorithmsClusteringEnsemble Learning - TikTokMediumData ScientistMaximize Distinct Purchases Within Budget Constraints
This question evaluates understanding of selection and optimization under budget constraints, algorithmic efficiency, and the ability to implement correct logic for maximizing the number of distinct items purchased.
Coding & AlgorithmsOnline Assessment - TikTokMediumData ScientistMaximize products bought under budget
This question evaluates algorithmic problem-solving skills including sorting, prefix-sum accumulation, binary search, greedy selection, careful tie-breaking for lexicographic order, and complexity analysis.
Coding & AlgorithmsOnline Assessment - TikTokMediumSoftware EngineerSolve four algorithm design tasks
This multi-part question evaluates algorithm design and data-structure competencies including wildcard string pattern matching and trade-offs between dynamic programming and greedy strategies, dynamic pair-sum maintenance under frequent updates, O(1) LRU cache design, and scheduling/ordering for time-constrained threat neutralization.
Coding & AlgorithmsOnline Assessment - TradedeskMediumSoftware EngineerProcess Operations in a Timestamped In-Memory Database
This problem tests your ability to design an in-memory data store with complex querying and expiration requirements using efficient nested data structures.
Coding & AlgorithmsOnline AssessmentHash MapSortingData Structures
Salesforce
Snapchat
Snowflake
Squarepoint
Stripe
Tesla
The Trade Desk
TikTok
Tradedesk