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Data structures and algorithms interview questions and answers

Data structure interview and data structure algorithms questions are specifically created to familiarize you with the nature of your questions about data structures algorithms in your data structure interview. Because, according to my experience, excellent data structure interviewers seldom intend to request a specific topic during your data structure interview, inquiries usually begin with a fundamental notion of the issue and will be discussed further later.

Data structure Interview questions that are new and encountered in actual IT industry data structure interviews. These questions on the structure of the data structure interview were mainly intended to help you understand the type of questions you can ask during your data structure interview.

The data structure is a technique to structurally and systematically define, store and retrieve data. Another form of a data element may be found in a data structure.

Topics in Data Structure Algorithm-

  • Searching
  • Sorting
  • Linked Lists

Commonly Asked DSA Interview Questions 

1. What is the structure of the data?

A data structure is a technique to organize the data to make efficient use of the data. Various types of data structures are suitable for various types of applications, some being extremely specialized. B-trees are, for example, especially ideal for database implementation, but compiler implementations often utilize hash tables to look for identifiers.

2. What is a linked list?

A list linked is a sequence of nodes where every node is linked to the node after it. This establishes a connection for data storage like a chain.

3. Describe the Data Structures types?

In particular, data structures are divided into two types:

Linear Data Structure: If all its elements are arranged in a sequential sequence, a data structure is termed linear. The items are saved non-hierarchically in linear data structures, with each item having successors and predecessors other than the first and last element.

Non-Linear Data Structure: The non-linear data structure is not a sequence, i.e. each item or element in a non-linear arrangement is associated with two or more other factors. In the sequence structure, the data elements are not ordered.

4. How different from the array is the Linked List?

Array-linked list differences are –

1) Arrays are index data structures in which an index is linked to each element. On the other hand, the list of linked elements relies on references where the data and references of the previous and next elements are included in each node.

2) Arrays have their size fixed, lists linked have size dynamic.

 3) Randomly accessed by index in array elements while in sequence accessible items in the linked list.

4) Insert and delete operations in the array are costly, but in the linked list they are readily done.

5) The linked list requires extra memory space for the next node storage address.

6) During the compile-time in the array, the item placement should be assigned while during run time in the linked list.

5. What is the difference between a linear data structure and a nonlinear data structure?

If a sequence or a linear list is formed with data structure elements, then a linear data structure is termed. Non-linear data structures, on the other hand, are ones in which non-linear transversal of nodes occurs.

Arrays, linked lists, ports and queues are examples of linear data structures and nonlinear data structure graphs and trees.

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6. What Is the Difference Between a Stack and An Array?


i) Stack is a collection of articles arranged.

ii) Stack is a dynamic object whose size changes steadily when things are pressed and popped.

(iii) Stack may have many sorts of data.

iv) Stack is specified as a structure with an array that holds the stack element, and an integer that specifies the stack top in the array.


i) Array is a group of articles ordered.

ii) Array is an object static, i.e. no item is fixed, and the array statement assigns it.

iii) It includes the same kinds of data.

iv) A pile array, i.e. a pile array can be declared large enough to have the maximum stack size.

7. Can we get a sorted Linked list using the binary search data structure algorithm?

No, the binary data structure algorithm cannot be used for a sorted linked list since it is impossible to determine an index of the middle member.

8. What is an asymptotic analysis of a data structure algorithm?

The mathematical binding/framing of its run-time functioning refers to the asymptotic analysis of a data structure algorithm. We can very easily infer the best, average and worst-case case scenario of a data structure algorithm for the data structure with asymptotic analysis.

9. Explain several Linked List kinds.

Types of Linked List:

  1. Singly Linked List: Each node saves address or reference to the next node in the list with the following node or reference as NULL in this form of linked list. For instance, 1->2->3->4-> NULL
  2. Doubly Linked List: Here are two references for each node, one for the next and one for the prior nodes. The other for the next. For instance, zero. <-1<->2<->3-> NULL
  3. Circular Linked List: Circular list linked is a list with links that connect all the nodes into a circle. No NULL at the end. At the end. A round linked list may be a single circular linked list or a round linked list. For example, 1->2->3->1. [The final node’s next pointer points to the first]

10. What operations on data structures can be performed?

After operations can be carried out –

 Insertion: Adding a new data item.

 Deletion: Deleting the existing data item.

 Traversal: Accessing each data item.

 Searching: Finding a particular data item.

 Sorting: Arranging the data item in a particular sequence.

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11. What is a queue?

A queue is a data structure capable of simulating a list or data stream. New elements at one end are put in this structure and existing elements at the other.

12. What does a binary search mean to you?

A binary search is a data structure algorithm for the data structure that starts from the central search. If the middle element is not the target element, it checks further if the lower half of the higher half is to continue to be searched. The procedure continues till the end of the item.

Do you know how dynamic data management supports the allocation of memory?

Simple structured data types are stored with Dynamic Memory attribution. In addition, it may combine the structured blocks allotted individually to build composite structures which, when needed, shrink and grow.

13. Which data structure is appropriate for recurrence and why?

Stack is the perfect way to operate recursion. It recalls the components and their location, mainly because of its LIFO (Last in First Out) characteristics, so it knows precisely which one to return when a function is called.

14. What instances are there of data structure algorithms divided and conquered?

The following issues can be solved using the procedure of division and data structure −

  • Merge Sort
  • Quick Sort
  • Binary Search
  • Strassen’s Matrix Multiplication
  • Closest pair (points)

15. How does depth-first traversal work?

Depth First Data Structure Algorithm traverses a graph in a deep movement and utilizes a stack to remember when a dead end occurs in every iteration, the next vertex to start a search.

These commonly asked DSA questions help you during a data structure interview.

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