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DSA Interview Questions And Answers

SOOPRO Pathshala provides DSA Interview Questions and Answers


1. What is a Data Structure?

The Data Structure is the way data is organized and manipulated for retrieval and access.


2. Describe the types of Data Structures?

The following are the types of data structures:

Lists: A collection of related things linked to the previous or/and following data items.

Arrays: A collection of values that are all the same.

Records: A collection of fields, each of which contains data from a single data type.

Trees: A data structure that organizes data in a hierarchical framework. This form of data structure follows the ordered order of data item insertion, deletion, and modification.

Tables: The data is saved in the form of rows and columns. These are comparable to records in that the outcome or alteration of data is mirrored across the whole table.

3. What is a Linear Data Structure? Name a few examples.

A data structure is linear if all its elements or data items are arranged in a sequence or a linear order. The elements are stored in a non-hierarchical way so that each item has successors and predecessors except the first and last element in the list.


4. What are some applications of Data Structures?

In terms of data structure interview questions, this is one of the most frequently asked question.

Numerical analysis, operating system, AI, compiler design, database management, graphics, statistical analysis, and simulation.


5. What is the difference between file structure and storage structure?

The difference lies in the memory area accessed. Storage structure refers to the data structure in the memory of the computer system, whereas file structure represents the storage structure in the auxiliary memory.


6. What is an algorithm? ?

An algorithm is a step by step method of solving a problem or manipulating data. It defines a set of instructions to be executed in a certain order to get the desired output.


7. What is stack?

A stack is an abstract data type that specifies a linear data structure, as in a real physical stack or piles where you can only take the top item off the stack in order to remove things. Thus, insertion (push) and deletion (pop) of items take place only at one end called top of the stack, with a particular order: LIFO (Last In First Out) or FILO (First In Last Out).


8. Where are stacks used?

  • Expression, evaluation, or conversion of evaluating prefix, postfix, and infix expressions
  • Syntax parsing
  • String reversal
  • Parenthesis checking
  • Backtracking

9. What are the operations that can be performed on a stack?

A stack is a linear data structure that operates on the same concept, in that components in a stack are added and deleted only from one end, referred to as the TOP. As a result, a stack is known as a LIFO (Last-In-First-Out) data structure because the piece that was put last is the first to be removed


10. What is a postfix expression?

A postfix expression is made up of operators and operands, with the operator coming after the operands. That is, in a postfix expression, the operator comes after the operands. Likewise, what is the proper postfix form? The correct postfix phrase is A B + C *.


11. What is a Dequeue??

It is a double-ended queue, or a data structure, where the elements can be inserted or deleted at both ends (FRONT and REAR).


12. What is the merge sort? How does it work?

Merge sort is a divide-and-conquer algorithm for sorting the data. It works by merging and sorting adjacent data to create bigger sorted lists, which are then merged recursively to form even bigger sorted lists until you have one single sorted list.