Most Frequently Asked Data Structure Interview Questions

A data structure is an essential part of computer systems. It is a compilation of data values, the connections among them, as well as the functions that can be applied to the data. Essentially, it is a particular way of organizing data in a system so that it can be utilized productively. Before appearing for any algorithm and data structure interview, it is important to go through the most frequently asked data structure interview questions and answers.

Check out some of the most common data structure interview questions:

What are linear and non-linear data Structures?
  • Linear: A data structure is linear if its elements form a sequence or a linear list. For example, Array, Linked List, Stacks, and Queues
  • Non-Linear: A data structure is non-linear if the traversal of nodes is nonlinear in nature. For example, Graphs and Trees.
What are the different processes that can be performed on distinctive Data Structures?
  • Insertion: Used to add a new data item in the given collection of data items.
  • Deletion: Used to delete an existing data item from the given collection of data items.
  • Traversal: Used to access each data item exactly once so that it can be processed.
  • Searching: Used to find out the location of the data item if it exists in the given collection of data items.
  • Sorting: Used for regulating the data items in either ascending or descending sequence in case of numerical data and in dictionary order in case of alphanumeric data.
How is an Array different from Linked List?
  • While the size of the arrays is fixed, the Linked Lists are Dynamic.
  • Adding and eliminating a new element in an array of elements is costly, whereas both addition and deletion can quickly be done in Linked Lists.
  • Random access is not allowed on Linked Listed.
  • Additional memory space for a pointer is needed with each element of the Linked list.
  • Arrays have a more reliable cache locality that can make a rather big difference in performance.
What is a Queue?

The queue is a linear structure that follows the order is First In First Out (FIFO) to access elements. Mainly the central operations on queue include, Enqueue, Dequeue, Front, Rear

How is Queue different from a stack and how is it implemented?

The main difference between stacks and queues is in eliminating. In a stack we eliminate the item that is most newly added; in a queue, we eliminate the item the least freshly added. Both Queues and Stacks can be executed using Arrays and Linked Lists.

What is the difference between file and structure storage structure?

The principal difference between both the data structure is the memory area that is being accessed. When it deals with the structure that resides the main memory of the computer system, this is referred to as storage structure. In contrast, when it deals with an auxiliary structure, we refer to it as file structures.

Which Data Structure can be used for executing LRU cache?

Two data structures can be used to implement an LRU Cache.

  1. A Queue, that can be executed using a doubly-linked list. The greatest size of the queue will be equivalent to the total number of frames available.
  2. A Hash, that is implemented with page number as key and address of the identical queue node as value.

Author : Washija

About the Author: Washija

Washija is a content specialist. She has an MBA in Tourism and a passion for creating web content. She is an avid reader, a traveler, and a versatile writer. She has been writing on the topics of education, career advice, and related areas for the past 3 years.

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