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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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Showing 601–630 of 1706 results
- GoogleHardSoftware EngineerFind secret word with match-count feedback
This question evaluates algorithmic reasoning and inference from constrained feedback, testing skills in information-theoretic deduction, pattern matching, and search strategy within a bounded-query interactive setting.
Coding & AlgorithmsTechnical Screen - GoogleMediumSoftware EngineerFind shared objects across two log files
This question evaluates the ability to design efficient algorithms and data-processing strategies for identifying shared object identifiers across large log files, testing skills in streaming processing, set membership handling, and external-memory algorithm reasoning.
Coding & AlgorithmsTechnical Screen - GoogleMediumSoftware EngineerFind shortest relationship path using BFS
This problem tests your ability to model a relationship network as a graph and implement Breadth-First Search (BFS) to find the shortest path length between two nodes.
Coding & AlgorithmsTechnical ScreenGraphBFSShortest Path - GoogleMediumSoftware EngineerFind shortest subarray with at least k distinct
This problem tests your ability to use the sliding window (two-pointer) technique combined with hash maps to find an optimal subarray satisfying a frequency constraint.
Coding & AlgorithmsTechnical ScreenSliding WindowHash MapArrays - GoogleMediumSoftware EngineerFind shortest subarray with ≥k distinct integers
This question tests the ability to solve subarray problems using the sliding window (two-pointer) technique and hash maps to track element frequencies.
Coding & AlgorithmsTechnical ScreenSliding WindowTwo PointersHash Map - GoogleMediumSoftware EngineerFind the Largest Monotone Increasing Number
Tests greedy algorithms, digit manipulation, and boundary handling to find the largest number less than or equal to n with non-decreasing decimal digits.
Coding & AlgorithmsTechnical Screengreedymathstring - GoogleHardSoftware EngineerFind the Longest Straight Run of One Color
Tests grid traversal and dynamic programming to find the maximum consecutive sequence of identical elements along horizontal, vertical, and diagonal lines.
Coding & AlgorithmsTechnical Screenmatrixdynamic-programmingarray - GoogleMediumSoftware EngineerFind where to cut cake into equal areas
This problem tests your ability to model a geometric area as a function and solve for a specific threshold using a binary search or linear sweep approach.
Coding & AlgorithmsTechnical ScreenGeometryArraysPrefix Sums - GoogleEasySoftware EngineerImplement Batched Undo/Redo Layer
This question evaluates understanding of state management, undo/redo semantics, batched transactional edits, and memory-efficient change history representation for map-based document layers.
Coding & AlgorithmsTechnical Screen - GoogleHardSoftware EngineerImplement Longest-Match Text Replacement
This question evaluates string processing, pattern matching, greedy algorithm reasoning, and data structure design for efficient longest-prefix token replacement, and is categorized under Coding & Algorithms.
Coding & AlgorithmsTechnical Screen - GoogleMediumData ScientistImplement Sampling and Minimize Loss in Numerical Coding
This question evaluates proficiency in probability and numerical methods, focusing on sampling from truncated distributions and analytical properties of estimators under various loss functions.
Coding & AlgorithmsTechnical Screen - GoogleMediumSoftware EngineerImplement Trie Insert and Exact-Word Search
Implement trie insertion and exact-word search for up to a million total characters, distinguishing terminal words from mere prefixes and returning search results in operation order.
Coding & AlgorithmsTechnical Screen - GoogleMediumSoftware EngineerImplement a Reusable Locker Allocation System
Design and implement a locker bank management system that assigns the lowest available locker index, handles invalid store and pickup operations, releases lockers immediately, and tracks the last package successfully stored in each locker.
Coding & AlgorithmsTechnical Screenheaphash-tabledesign - GoogleMediumMachine Learning EngineerImplement a Transformer Block with SwiGLU
This question evaluates implementation and reasoning skills for Transformer internals, testing competency in multi-head self-attention, SwiGLU gated feed-forward layers, residual connections, and layer normalization within the Machine Learning / deep learning domain.
Coding & AlgorithmsTechnical Screen - GoogleMediumData ScientistImplement anagram check and stable deduplication
This question evaluates streaming algorithm design, Unicode normalization and locale-aware text processing, multiset frequency counting under tight time and memory bounds for an anagram checker, and stable, order-preserving deduplication with custom keys and NaN handling; it is in the Coding & Algorithms domain for a Data Scientist position.
Coding & AlgorithmsTechnical Screen - GoogleMediumSoftware EngineerImplement frequency + distance top‑K queries
This pair of problems evaluates algorithmic and data-structure skills including frequency counting, multi-criteria ordering and selection for top-K results, geometric distance computation for tie-breaking, and time-indexed storage with nearest-timestamp retrieval.
Coding & AlgorithmsTechnical Screen - GoogleMediumSoftware EngineerImplement iterator merging lists with filtering
This problem tests your ability to design a stateful iterator that performs a multi-way merge on sorted streams while applying filtering and deduplication logic on the fly.
Coding & AlgorithmsTechnical ScreenIteratorsHeapMerge K Sorted - GoogleMediumData ScientistImplement percentage RMSE and bootstrap its CI
This question evaluates implementation and statistical reasoning skills, focusing on robust numerical computation of percentage RMSE (including handling zeros/negatives, optional country weights, and numerical stability) and nonparametric bootstrap methods for confidence intervals.
Coding & AlgorithmsTechnical Screen - GoogleMediumData ScientistImplement piecewise linear interpolation for time-to-empty
This question evaluates numerical interpolation, time-series data cleaning, monotonicity preservation, extrapolation, and numerical stability skills applied to battery discharge curves, and falls under coding and algorithms within a data science domain.
Coding & AlgorithmsTechnical Screen - GoogleMediumData ScientistImplement sampling and subarray scan
This question evaluates probabilistic sampling and random-number transformation concepts for generating uniform points in a continuous domain, alongside array-processing and algorithmic analysis skills for identifying the longest strictly increasing contiguous subarray.
Coding & AlgorithmsTechnical Screen - GoogleEasyData ScientistImplement sampling, subarray scan, and percentile estimate
This problem tests your ability to generate random uniform points within a geometric shape, process contiguous array properties using linear scans, and perform linear interpolation on histogram data to approximate percentiles.
Coding & AlgorithmsTechnical ScreenGeometryAlgorithmsStatistics - GoogleEasySoftware EngineerImplement string formatting and request tracking tasks
This question tests string manipulation, character mapping logic for rotational symmetry, and the ability to manage time-ordered event tracking using appropriate data structures.
Coding & AlgorithmsTechnical ScreenStringsTwo PointersHash Maps - GoogleMediumMachine Learning EngineerImplement substring search and weighted sampling
This question tests the ability to implement a fast substring matching algorithm and a data structure that supports weighted random sampling from a dynamic collection of items.
Coding & AlgorithmsTechnical ScreenString MatchingKMPProbability - GoogleHardSoftware EngineerInfection Spread on a Grid (Cellular Automaton)
Implement an optimized discrete-time cellular automaton simulating epidemic spread on a 2D grid with recovery durations, barriers, and multi-neighbor infection thresholds.
Coding & AlgorithmsTechnical ScreenBreadth-First SearchSimulationMatrix - GoogleMediumSoftware EngineerLoad a Delivery Van With Equal-Size Crates for Maximum Profit
Pick crates from limited stock to fill a van whose slots can number in the billions, when every crate takes one slot; recognize that the scary-looking bounded knapsack collapses to a greedy, then answer many capacity queries fast.
Coding & AlgorithmsTechnical Screengreedysortingprefix-sums - GoogleMediumData ScientistMatch payments to invoices by memo or amount
This problem tests string parsing, hash-map based data indexing, and multi-criteria reconciliation logic (fuzzy matching via IDs vs. exact matching via amount).
Coding & AlgorithmsTechnical ScreenHashingStringsData Reconciliation - GoogleMediumSoftware EngineerMatch people to questions using tags and priorities
This problem tests your ability to model a constrained matching problem using greedy or flow-based approaches while managing priority queues for tie-breaking.
Coding & AlgorithmsTechnical ScreenGreedyHeapsSorting - GoogleMediumSoftware EngineerMaximize 1D deliveries within distance and minimize total distance
This problem tests your ability to prioritize objectives using a greedy strategy or sorting to maximize deliveries while minimizing travel cost within a constrained route.
Coding & AlgorithmsTechnical ScreenSortingGreedyOptimization - GoogleMediumSoftware EngineerMaximize Throughput Packing Reserved Compute Slots With Limited Stock
Choose how many reserved instances of each type to allocate into a shared rack-slot budget, each instance occupying exactly one slot, to maximize total throughput score given limited stock per type.
Coding & AlgorithmsTechnical Screenknapsackgreedysorting - GoogleMediumSoftware EngineerMaximize sum without choosing adjacent elements
This problem tests your ability to solve optimization challenges using dynamic programming by identifying overlapping subproblems and optimal substructure in an array.
Coding & AlgorithmsTechnical ScreenDynamic ProgrammingArrayOptimization
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