Top 50 Data Structures Interview Questions
The most frequently asked Data Structures questions across all roles and companies, ranked by real interview frequency. Updated daily.
Use a two-pointer string scan to determine whether a string reads the same forward and backward.
Dsv Air & Sea
Lucid Motors
AfterqueryMerge two sorted linked lists in ascending order using an iterative two-pointer technique.
Cognizant
Jio
NagarroImplement a set-like structure using an array and hash map to support insert, delete, and random access in average O(1) time.
WorldQuant
360Learning
Asana SpaImplement an LRU cache with O(1) get and put operations using a hash map and doubly linked list.
Collins Aerospace
Larsen & Toubro
Del Rey Systems & TechnologyImplement seeded random-hyperplane locality-sensitive hashing to return the most similar high-dimensional vectors.
Mercedes-Benz GroupExplain the time and auxiliary space complexity of duplicate detection using a hash set.
Western DigitalCCodingmart Technologies
Enterprise ProductsDetect whether a linked list contains a cycle using Floyd's tortoise-and-hare algorithm in O(n) time and O(1) space.
Lumenalta
J.P. MorganFind the minimum-cost path between two graph nodes using Dijkstra's algorithm.
Reliance Industries
Robert Bosch
University of HoustonSign up to see every question
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