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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 1801–1830 of 3276 results
- MetaMediumSoftware EngineerSum Numbers Formed by Root-to-Leaf Paths
Tests traversal of a complete or sparse binary tree stored in an array, tracking path values to accumulate the total sum of numbers formed from root to leaf.
Coding & AlgorithmsOnsiteTreeDFSBinary Heap - MetaMediumSoftware EngineerTraverse binary tree by levels with constraints
This question evaluates binary tree traversal techniques, use of stacks as constrained data structures, predicate-based filtering of nodes, and the ability to argue algorithmic correctness and analyze time and space complexity.
Coding & AlgorithmsTechnical Screen - MetaMediumSoftware EngineerTraverse levels selecting nodes meeting a predicate
Traverse levels selecting nodes meeting a predicate 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 & AlgorithmsTechnical Screen - MetaMediumSoftware EngineerValidate Sorted Order Under a Custom Alphabet
This problem tests your ability to define custom comparison logic using a lookup table and verify if a list of strings adheres to a non-standard lexicographical ordering.
Coding & AlgorithmsTechnical ScreenArraysStringsSorting - MetaMediumSoftware EngineerValidate a simplified numeric string
This question evaluates string-parsing, formal-grammar validation, and edge-case reasoning competencies, including the ability to recognize valid numeric formats and to provide time and space complexity analysis.
Coding & AlgorithmsTechnical Screen - MetaMediumSite Reliability EngineerValidate abbreviations and brackets
This question evaluates proficiency in string parsing, pattern validation, and algorithmic correctness, covering abbreviation interpretation and bracket balancing while requiring careful handling of edge cases and input constraints.
Coding & AlgorithmsTechnical Screen - MetaMediumData EngineerValidate alternating checkout/return logs
This question evaluates the ability to process sequential event logs, maintain per-entity state invariants (checkout vs return), and reason about algorithmic time and space complexity within a validation task.
Coding & AlgorithmsTechnical Screen - MetaMediumData EngineerValidate carpool capacity
This question evaluates understanding of interval-based resource accounting and algorithmic reasoning with cumulative constraints, assessing skills in processing time-bound events and managing capacity limits.
Coding & AlgorithmsOnsite - MetaMediumSoftware EngineerValidate parentheses and find k-th largest
This problem tests your ability to handle nested structures using a stack and your efficiency in order-based selection using heap operations.
Coding & AlgorithmsTechnical ScreenStackHeapQuickSelect - MetaMediumSoftware EngineerValidate word abbreviation and reconcile two abbreviations
Validate word abbreviation and reconcile two abbreviations 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 & AlgorithmsOnsite - MetaHardData EngineerWrite SQL for car rental utilization by city
This question evaluates proficiency in SQL querying and relational data modeling, focusing on time-interval overlap logic, distinct aggregation across joined tables, null handling, and safe computation of utilization metrics.
Coding & AlgorithmsOnsite - MetaMediumData EngineerWrite queries for follows and bookings
This problem tests your ability to manage relational data, handle temporal overlaps for booking availability, and derive insights from social graph-like connections using SQL or data manipulation scripts.
Coding & AlgorithmsTechnical ScreenSQLIntervalsGraphs - Micro1MediumSoftware EngineerMerge Overlapping Intervals
Tests sorting and linear scanning techniques to consolidate overlapping and adjacent closed intervals into a minimal sorted set.
Coding & AlgorithmsOnline Assessmentarrayssortingintervals - MicrosoftMediumSoftware EngineerAnswer Running Median Queries Over a Stream of Inserted Integers
A coding problem that processes a stream of add and median operations and returns, for every query, the median of all integers inserted so far. It tests choosing data structures that keep the middle of a growing collection quickly accessible, plus correct averaging when the count is even.
Coding & AlgorithmsOnsite - MicrosoftMediumSoftware EngineerAnswer common graph, grid, and array tasks
This problem tests your ability to model a dependency system as a directed graph and identify if a valid order exists using cycle detection (Kahn's Algorithm or DFS).
Coding & AlgorithmsTechnical ScreenGraphTopological SortDFS - MicrosoftHardSoftware EngineerAnswer suffix maximum-frequency queries
This problem tests your ability to optimize range frequency queries using precomputation and efficient data structures, specifically focusing on suffix-based constraints.
Coding & AlgorithmsOnsiteBinary SearchData StructuresArrays - MicrosoftMediumSoftware EngineerAssemble DNA payload strings from tagged fragments
This question evaluates proficiency in string manipulation, sequence assembly, and labeled-graph path reconstruction—skills involved in ordering fragments by matching start/end tags and concatenating payloads—and it belongs to the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - MicrosoftHardSoftware EngineerAssemble async stream reads into objects
This problem tests your ability to handle partial reads from an asynchronous stream and correctly parse length-prefixed binary data structures.
Coding & AlgorithmsOnsiteAsyncStreamsBinary-Parsing - MicrosoftMediumSoftware EngineerBucket Words That Are Letter Rearrangements of One Another
A coding exercise that partitions a list of lowercase words into groups whose members use exactly the same letters with the same counts, returned in a fixed canonical order. It tests efficient grouping over up to ten thousand words, handling duplicates and empty strings, and producing deterministic sorted output.
Coding & AlgorithmsOnsite - MicrosoftMediumSoftware EngineerBuild a CSV Query Engine
This problem tests your ability to parse structured text, perform basic type inference, and implement a filtering mechanism for tabular data.
Coding & AlgorithmsTechnical ScreenParsingData ModelingType Inference - MicrosoftMediumSoftware EngineerCheck a Linked List Palindrome Without Mutating It
Check whether a singly linked list is a palindrome in O(n) time and O(1) pointer space without leaving it modified. Practice finding the midpoint, reversing the second half, comparing values, and restoring every link before return.
Coding & AlgorithmsOnsite - MicrosoftMediumSoftware EngineerCheck palindrome and find next larger palindrome
This question tests string manipulation, edge-case handling, and algorithmic efficiency in generating the smallest palindrome greater than a given numeric string.
Coding & AlgorithmsTechnical ScreenStringsTwo PointersMath - MicrosoftMediumSoftware EngineerCheck palindrome number and next palindrome
This question tests your ability to manipulate digits of an integer to identify palindromes and efficiently construct the smallest palindrome greater than a given number.
Coding & AlgorithmsOnsiteMathStringsAlgorithms - MicrosoftHardSoftware EngineerCompute discounted prices and full-price indices
This question evaluates array-processing skills, competency with next-smaller-or-equal element patterns, and the ability to compute aggregated results under ordering constraints.
Coding & AlgorithmsTechnical Screen - MicrosoftHardSoftware EngineerCompute product of array except self
This problem tests your ability to manipulate array prefixes and suffixes to compute aggregate values efficiently without using the division operator, while handling constraints like modular arithmetic.
Coding & AlgorithmsOnline AssessmentArrayPrefix SumOptimization - MicrosoftMediumSoftware EngineerCompute shortest path in cyclic graph
This question tests the ability to implement a shortest-path algorithm in a directed graph that may contain cycles, specifically evaluating the selection between Dijkstra's algorithm and Bellman-Ford based on edge weight constraints.
Coding & AlgorithmsTechnical ScreenGraphsShortest-PathDijkstra - MicrosoftMediumSoftware EngineerCompute sum of longest positive subarray
Compute sum of longest positive subarray 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 & AlgorithmsTechnical Screen - MicrosoftMediumSoftware EngineerConvert a Hexadecimal Address to Dotted IPv4
Convert an eight-digit hexadecimal address to network-order dotted IPv4 with strict validation, optional prefixes, and correct high-bit handling.
Coding & AlgorithmsOnsite - MicrosoftMediumSoftware EngineerCount Binary Substrings with Two Equal Blocks
Tests string traversal, run-length grouping, and recognizing how adjacent homogeneous blocks contribute to valid balanced substrings.
Coding & AlgorithmsOnline AssessmentStringsTwo PointersGreedy - MicrosoftHardSoftware EngineerCount Non-Decreasing Arrays with Prescribed Digit Sums
Count non-decreasing arrays whose values are at most 5000 and match specified decimal digit sums, returning the total modulo 1000000007.
Coding & AlgorithmsOnline Assessment
Meta
Microsoft