# Data Structure Interview Questions

Last updated on Feb 06, 2023
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A data structure is a user-preferred, specialized format to organize, manage, and store data for quick and efficient access and modification. A vast variety of Data Structure Interview Questions are also available on our website. Every data structure is designed to assemble and hold data to suit a specific purpose and preferably work with various algorithms. It renders multiple data elements regarding relationships and serves as the basis for Abstract Data Types. Implementing a data structure requires creating a set of procedure that produces as well as manipulate instances of that structure.

#### Benefits of Data structure

• With the help of Data structures, the desired data can be searched in a concise period from the vast amount of stored data like about data having an inventory of about 2 million items
• Multiple requests can be handled using the data structures like at a time processing the application of the thousands of user on the web browser.
• You can access the data from anywhere at any point in time.
• Data Structures helps in designing efficient algorithms.

Data Structures are used to organize the data in the memory of the computer in a very systematic manner to reduce the complexities of the task performed by the processor. As a result the performance of the computer or server increases. Here is the list of top algorithm interview questions which can help you to crack your interviews.

### Data Structures and algorithms interview questions

Here in this article, we will be listing frequently asked Data Structure Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. What do you mean by graph?

It’s a non-linear data structure which consists of nodes and edges. The edges are referred to as arcs and lines that connect any two nodes in the graph, whereas the nodes here also referred to as vertices.

Q2. What do you mean by AVL tree?

It’s a self-balanced binary search tree and first data structure to be invented. Here the heights of the two child subtrees of any node only differ by at most one. If the difference stands for more than one, rebalancing is done to restore the property.

Q3. What is BFS and DFS used in graph?

BFS and DFS are two algorithms of the graph data structure. DFS algorithm traverses the graph in a way that it tries to go far from the root node. Its implementation uses the stack. Compared to this, the BFS algorithm traverses the graph as close as possible to the root node.

Q4. Explain the differences between B tree and B+ tree?

The principal difference between a B tree and a B+ tree will be, in a B Tree is capable of saving both keys and data in the leaf and internal nodes, whereas the B+ can only store data in the leaf nodes.

Q5. What is tree traversal and how we can do it?

This is a form of graph travelers and refers to a whole process of visiting each node in a tree data structure for check and update. The inorder traversals share nodes in nondecreasing order; the preorder traversals are used to create a copy of the tree and get prefix expression on of an expression tree, whereas the postorder traversal is required to delete a tree.

Note: Our data structures and algorithms interview questions has been created by experts. It shall help you to answer some of the most asked questions during a job interview.

Q6. What do you mean by Fibonacci search?

It’s a set of numbers which starts either from a zero or a one and then followed by a one, then proceed based on the rule that each number is equal to the sum of the preceding two numbers.

Q7. What is Huffmanâ€™s algorithm? Explain

It’s a method used to build an extended binary tree with a minimum weighted path length from a given weight set. It’s a lossless data compression algorithm.

Q8. What are the uses of data structures?

Data Structure supports in correctly organizing the data in a computer memory due to which the data is quickly provided to the processor for the required calculations and this result in the overall increase in the performance of both computer and program. Using the data structure, it is easy to locate and retrieve the massive amount of data.

Q9. How many types of operations can be performed on data structures?
##### Six types of operations are performed on data structures:-

1. Insertion: Insertion means adding a new record or data element to the data structure.

2. Deletion: Deletion means deleting the existing record or the data element from the data structure if the component is present.

3. Searching: Searching means searching the location of the particular data element in a data structure.

4. Traversal: Traversal means accessing each data element in the data structure only once so that the data elements can be processed.

5. Sorting: Sorting means arranging data elements of a data structure in a specified order like if the data elements are numerical then in the Ascending or Descending order and if Alphanumeric then in the Dictionary order.

6. Merging: Merging means Combining the data elements of two similar data structures to form a new data structure which is of the same type.

Note: It supports multiple programming paradigms, such as internal, procedural, object-oriented, and algorithms. Our collection of data structure questions shall help you to understand the basics of this language.

Q10. What is the difference between Storage structure and file structure?