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
AfterqueryReverse a singly linked list iteratively and recursively while preserving every node and returning the new head.
Netsuite
Macquarie GroupAAppLogic NetworksReverse a singly linked list in place using iterative pointer manipulation with O(n) time and O(1) extra space.
Lenovo
SprinklrNNexturnImplement a set-like structure using an array and hash map to support insert, delete, and random access in average O(1) time.
WorldQuant
360Learning
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Detect a cycle in a Capgemini Engineering linked-list model using Floyd's tortoise-and-hare algorithm in O(n) time and O(1) space.
Capgemini Engineering
Relativity Space
Intuitive SurgicalImplement a doubly linked list with indexed access, mutation, reversal, and constant-time end operations.
Hays
international advanced analytics dataReverse a singly linked list in place using constant extra space and return its new head.
TelesignReverse a singly linked list in place using pointer reassignment with O(n) time and O(1) extra space.
Samsung Electronics
ADP
Open Systems Technologies