data structure and algorithm interview questions

Top 10 Data Structures Interview Questions that's mostly asked in Every Competitive Field.

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1.) What is Data Structure  ? 

Data Structure is a way of storing, accessing, retrieving, defining data in systematic way. we can also say that Data Structure is a way of collecting data and organizing data in a Efficient way that can we use Efficiently.

There is Two Types of Data Structure 1.) Linear Data Structures 2.) Non-Linear Data Structure .

2.) What are various Data Structures available ? 

Data Structures are different in many Programming Languages below Data Structures used in C language.
Commonly available Data Structures are list, arrays, stack, queues, graph, tree etc.

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3.) What is Algorithm ? 

Algorithm is a step by step procedure, which defines a set of instructions to be executed in certain order to get the desired output.

4.) When is a Binary Search best applied ? 

A Binary Search is an algorithm that is best to applied to search when list is already in sorted manner.Binary Search works on Divide and Conquer method.In Binary Search if we find Middle Element then we compare search value to mid element if value not found then we increment first index and decrease last index then find again mid element and compare it's to searching Value.Repeat Until the Value are not Found.

5.) What is a Linked List  ? 

A Linked List is a Linear Data Structures and it's a Sequence Nodes.In which each node is connected to the next node using Pointers sometimes called Successor Nodes.This Forms a chain-like link for data Storage.Train is a best example of Linked List.

6.) What is Applications of Data Structures ?  

In generally, algorithms that involve Efficient Data Structure is applied in the Following Fields.

1. Numerical Analysis
2. Operating Systems
3. Artificial Intelligence 
4. Compiler Design 
5. Database Design 
6. Graphics Design
7. Statistical Analysis  

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7.) What is a Queue ? 

A Queue is a Linear Data Structure that's work on FIFO Techniques.In Queue Data Structures, new elements are Insertion at one end called Rear and Deletion at one other called Front.For Example : Ticket Counter at Railway Station.

8.) What is a Stack ? 

A Stack is a Linear Data Structure that's work on LIFO Approach.In which only the top element can be accessed.As data is stored in the stack, each data is pushed downward, leaving the most recently added data on Top.For Example : A Bundle of Books.

9.) What are Binary Trees ? 

A Binary Trees is a Non-Linear Data Structures that has two nodes, a left node, and a right node and one Root node or Parent Node. In Programming, binary trees are an extension of the Linked List Structures. 

10.) What is Binary Search Trees ? 

A Binary Search Tree stores a data in such a way that they can be retrieved very Efficiently.The Left sub-tree contains nodes whose key are less than the node's value and Right sub-tree contains nodes whose keys are greater than than node's value.

11.) What is Merge Sort ? 

Merge Sort use in sorting Array's.It's use divide and conquer approach for sorting the data.In a sequence of data, adjacent ones are merged and sorted to create bigger sorted lists. These sorted lists are then merged again to form an even bigger to sorted lists, which continues until You have one Single Sorted list.

12.) What is a Postfix Expression ? 

A Postfix Expression use Stack to Evaluate Operations.A Postfix Expression is an Expression in which each operator follows it's operands. The advantage of this form is that there is no need to group sub-expressions in Parentheses or to consider Operator Precedence.




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