practice a little every day, paws crossed ♡
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
- Questions
- 546
- Companies
- 11
- Topics
- 8
- Languages
Showing 2971–3000 of 3276 results
- UberMediumSoftware EngineerDetermine balanced k values in a permutation
This question evaluates algorithmic reasoning about permutations and contiguous subarray properties, testing skills in array manipulation, positional reasoning, combinatorial insight, and complexity-aware algorithm design within the Coding & Algorithms domain.
Coding & AlgorithmsOnline Assessment - UberMediumSoftware EngineerEvaluate an Arithmetic Expression
This problem tests your ability to parse and evaluate mathematical expressions involving integers, addition, subtraction, multiplication, division, and parentheses using stacks or recursion.
Coding & AlgorithmsOnsiteStackParsingString Manipulation - UberMediumSoftware EngineerFind Any Available Meeting Room
This question evaluates a candidate's competence in handling interval-based scheduling problems, specifically managing interval data and performing efficient searches within sorted bookings to detect potential overlaps.
Coding & AlgorithmsOnsite - UberEasySoftware EngineerFind Earliest Column With One
This question tests the ability to optimize searches in a sorted binary matrix by minimizing expensive API calls through efficient traversal techniques.
Coding & AlgorithmsTechnical ScreenBinary SearchOptimizationMatrix - UberMediumSoftware EngineerFind Earliest Full Connectivity Timestamp
This question evaluates understanding of graph connectivity and temporal event processing, examining how pairwise interactions over time can merge components into a single connected set.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerFind Kth Smallest in BST
This question evaluates understanding of binary search tree properties, ordered data retrieval, and algorithmic efficiency in locating the k-th smallest element.
Coding & AlgorithmsTechnical Screen - UberHardMachine Learning EngineerFind Robots by Nearest-Blocker Distances
Implement an algorithm to identify all robots in a grid whose four-directional distances to the nearest obstacle or grid boundary match a target query.
Coding & AlgorithmsTechnical Screenmatrixprefix-sumhash-table - UberMediumMachine Learning EngineerFind a Black-Box Convex Function Minimum
This question evaluates proficiency in zero-order optimization and algorithm design, focusing on reasoning about convexity and unimodality when only function evaluations are available.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerFind a Bounded Subarray and Largest Square
This question evaluates array manipulation and algorithmic problem-solving skills across two tasks: enforcing bounded value ranges within contiguous subarrays and identifying largest uniform square regions in binary matrices, exercising concepts such as range-tracking, efficient data structures, and dynamic programming.
Coding & AlgorithmsOnsite - UberMediumSoftware EngineerFind a Lexicographically Optimal Robot Path with Charging Cells
Find a path in a grid from start to target that lexicographically minimizes charging stations used, peak battery segment length, total moves, and breaks ties by flattened cell indices.
Coding & AlgorithmsTechnical ScreenGraphBFSShortest Path - UberMediumSoftware EngineerFind all dictionary words in a grid
This problem tests your ability to navigate a 2D grid using backtracking and optimize dictionary lookups using a Trie data structure.
Coding & AlgorithmsTechnical ScreenDFSBacktrackingTrie - UberHardSoftware EngineerFind cheapest flight with at most K stops
This question evaluates graph algorithm proficiency and problem-modeling skills, specifically working with directed weighted graphs to optimize path cost under a constraint on intermediate stops.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerFind earliest common meeting slot
This problem tests interval management and the ability to find a common free window across multiple disjoint sets of busy times while respecting daily working constraints.
Coding & AlgorithmsOnsiteIntervalsSortingGreedy - UberHardSoftware EngineerFind earliest time all riders become connected
Assesses understanding of graph connectivity, temporal event processing, and dynamic graph data-structures for determining when a set of nodes becomes a single connected component.
Coding & AlgorithmsOnsite - UberMediumSoftware EngineerFind leftmost point of maximum brightness
This question evaluates understanding of interval overlap counting, efficient use of ordered data structures for range events, tie-breaking logic, and robustness to numeric edge cases such as large coordinates and floating-point radii.
Coding & AlgorithmsOnline Assessment - UberMediumSoftware EngineerFind minimum activations to absorb all balls
This question evaluates the ability to model Euclidean-distance relations as a static connectivity graph and reason about the minimum number of activations needed to absorb all nodes, testing computational geometry and graph algorithms competency.
Coding & AlgorithmsOnline Assessment - UberMediumSoftware EngineerFind minimum reversals to orient edges away from root
This question evaluates understanding of directed graphs and rooted trees, the ability to reason about edge orientations and minimal reversals, and competency in traversal techniques and complexity analysis.
Coding & AlgorithmsOnline Assessment - UberMediumSoftware EngineerFind next and closest palindromes
This question evaluates string-based numeric manipulation and palindrome construction, including edge-case handling (all 9s, single-digit inputs, length changes), candidate generation and magnitude comparison of large numbers as strings, and carry propagation for fixed-length decimal palindromes.
Coding & AlgorithmsOnline Assessment - UberMediumMachine Learning EngineerFind robots in a grid whose four-direction distances to blockers match a query
Given a grid of robots, blockers and empty cells plus a query of four distances, return every robot whose distances to the nearest blocker or grid edge going up, down, left and right match the query exactly. Tests precise distance definitions, boundary handling and scaling past a per-robot scan.
Coding & AlgorithmsTechnical Screen - UberHardSoftware EngineerFind robots matching obstacle-distance signature
This problem tests spatial reasoning, multi-source Breadth-First Search (BFS) for distance mapping, and pattern matching within 2D grids.
Coding & AlgorithmsTechnical ScreenBFSDynamic ProgrammingMatrix - UberMediumSoftware EngineerFind shortest jumps in circular array
This question evaluates graph-traversal and modular arithmetic skills by requiring modeling a circular array as a state graph and determining reachability and minimum-distance jumps under wrap-around constraints.
Coding & AlgorithmsTechnical Screen - UberEasySoftware EngineerFind smallest start index avoiding left exit
This question evaluates a candidate's ability to analyze reachability and cycle behavior in array-based functional graphs, testing competency in array manipulation, traversal, loop detection, and runtime optimization within the Coding & Algorithms domain.
Coding & AlgorithmsOnsite - UberMediumSoftware EngineerFind the Best Currency Conversion Rate
Find the largest conversion factor obtainable between two currencies in a directed graph where rates multiply along each path. Handle parallel rates, unreachable targets, identical currencies, cycles, and floating-point tolerance under a finite-optimum guarantee.
Coding & AlgorithmsTechnical Screen - UberMediumSoftware EngineerFind the Cheapest Valid Round Trip
Find the cheapest round-trip flight pair satisfying a minimum stay duration constraint in linear time with deterministic tie-breaking.
Coding & AlgorithmsOnsiteArraysSuffix MinimumTwo Pointers - UberMediumSoftware EngineerFind the First Unique Log
This problem tests your ability to efficiently process a stream or list of logs to identify the first log entry that appears exactly once, emphasizing the use of hash maps and ordered tracking.
Coding & AlgorithmsOnsiteHash MapArraysData Streams - UberMediumSoftware EngineerFind the K Closest Points to a Query Location
This problem tests the ability to efficiently find the k nearest neighbors using a priority queue (max-heap) and custom sorting logic for tie-breaking.
Coding & AlgorithmsOnsiteHeapGeometrySorting - UberMediumData ScientistFind the Next Larger Palindrome
This question evaluates proficiency in numeric and string manipulation, algorithmic thinking, and edge-case reasoning related to palindromic number generation.
Coding & AlgorithmsOnsite - UberMediumSoftware EngineerGroup Anagrams
This problem tests your ability to identify and implement an efficient grouping mechanism using hash maps to categorize strings by a common canonical form.
Coding & AlgorithmsOnsiteHash TableStringSorting - UberMediumSoftware EngineerGroup strings that are anagrams
This problem tests your ability to efficiently group strings by their character composition using hash maps or sorting techniques.
Coding & AlgorithmsTechnical ScreenHash MapStringSorting - UberMediumSoftware EngineerHandle invalid Lisp expression parsing
This question evaluates the ability to parse and evaluate nested Lisp-like expressions, manage variable bindings and scope resolution, and detect malformed input and syntax errors.
Coding & AlgorithmsOnline Assessment
Uber