# Data structures interview questions and answers pdf

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## Top 50 Data Structures Interview Questions

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### Data Structures Interview Questions & Answers

Are you searching for Data Structures job? A Data Structure in computer science is a kind of managing and storing data in order to access it efficiently. Implementing data structures requires writing a set of procedures that are used in creating and managing instances of that structure.

Job opportunities are present everywhere for this position. Wisdomjobs created interview questions exclusively for the candidates who are in search of job. Question 1. What Is Data Structure? Answer : A data structure is a way of organizing data that considers not only the items stored, but also their relationship to each other. Advance knowledge about the relationship between data items allows designing of efficient algorithms for the manipulation of data.

Question 2. Answer : It must rich enough in structure to reflect the actual relationship of data in real world. The structure should be simple enough for efficient processing of data. Question 3. Answer : Data type is a collection of values and a set of operations on these values.

Abstract data type refer to the mathematical concept that define the data type. Question 4. Question 5. Answer : The definition which defines an object in terms of simpler cases of itself is called recursive definition.

Question 6. What Is Sequential Search? Answer : In sequential search each item in the array is compared with the item being searched until a match occurs. It is applicable to a table organized either as an array or as a linked list.

Question 7. Question 8. Answer : i Return address is retrieved. Question 9. What Is A Linked List? Answer : A linked list is a linear collection of data elements, called nodes, where the linear order is given by pointers. Each node has two parts first part contain the information of the element second part contains the address of the next node in the list. Question Answer : The disadvantages of array are:. Answer : No we cannot apply binary search algorithm to a sorted linked list, since there is no way of indexing the middle element in the list.

This is the drawback in using linked list as a data structure. Answer : Pool is a list consisting of unused memory cells which has its own pointer. Answer : It is a technique in which the operating system periodically collects all the deleted space onto the free storage list. The alternate method to this is to immediately reinsert the space into free storage list which is time consuming. Answer : When new data is to be inserted into the data structure but there is no available space i.

When we want to delete data from a data structure that is empty this situation is called underflow. Answer : A queue is an ordered collection of items from which items may be deleted at one end front end and items inserted at the other end rear end. What Is A Priority Queue?

Answer : The priority queue is a data structure in which the intrinsic ordering of the elements numeric or alphabetic. Answer : i Fixed amount of storage remains allocated to the data structure even if it contains less element. Answer : i A node in a linked list info and next field occupies more storage than a corresponding element in an array. Here p is called dangling pointer. To avoid this it is better to set p to NULL after executing free p. Answer : i We cannot reach any of the nodes that precede node p.

Define Circular List? Answer : In linear list the next field of the last node contain a null pointer, when a next field in the last node contain a pointer back to the first node it is called circular list. Define Double Linked List? Answer : It is a collection of data elements called nodes,. If frequent use of the file is required for the purpose of retrieving specific element, it is more efficient to sort the file. Answer : The number of comparisons depends on where the record with the argument key appears in the table.

Answer : Yes there is a set of implicit arguments that contain information necessary for the function to execute and return correctly. Array of structures Network data model — Graph Hierarchical data model — Trees. Answer : The heterogeneous linked list contains different data types in its nodes and we need a link, pointer to connect them.

It is not possible to use ordinary pointers for this. So we go for void pointer. Void pointer is capable of storing pointer to any type as it is a generic pointer type. Answer : Two. One queue is used for actual storing of data and another for storing priorities. Answer : Stack. Recursion makes use of system stack for storing the return addresses of the function calls.

Every recursive function has its equivalent iterative non-recursive function. Even when such equivalent iterative procedures are written, explicit stack is to be used. By the method of elimination:. Full binary trees contain odd number of nodes. So there cannot be full binary trees with 8 or 14 nodes, so rejected. With 13 nodes you can form a complete binary tree but not a full binary tree. So the correct answer is This corresponds to the records that shall be stored in leaf nodes. What Is A Spanning Tree?

Answer : A spanning tree is a tree associated with a network. All the nodes of the graph appear on the tree once. A minimum spanning tree is a spanning tree organized so that the total edge weight between nodes is minimized. Answer : No! Minimal spanning tree assures that the total weight of the tree is kept at its minimum.

Difference Between Calloc And Malloc? Answer : malloc: allocate n bytes. Array of structures Network data model Graph Hierarchical data model Trees. Answer : A linked list application can be organized into a header file, source file and main application file. The first file is the header file that contains the definition of the NODE structure and the LinkedList class definition. The second file is a source code file containing the implementation of member functions of the LinkedList class.

The last file is the application file that contains code that creates and uses the LinkedList class. Answer : The appendNode member function places a new node at the end of the linked list.

The appendNode requires an integer representing the current data of the node. What Is Linked List? Answer : Linked List is one of the fundamental data structures. It consists of a sequence of? A linked list is a self-referential datatype because it contains a pointer or link to another data of the same type.

Linked lists permit insertion and removal of nodes at any point in the list in constant time, but do not allow random access. Answer : Each entry in a linked list is called a node.

Think of a node as an entry that has three sub entries. One sub entry contains the data, which may be one attribute or many attributes. Another points to the previous node, and the last points to the next node. When you enter a new item on a linked list, you allocate the new node and then set the pointers to previous and next nodes. Answer : The isEmpty member method is called within the dequeue process to determine if there is an item in the queue to be removed i. This method is called by the dequeue method before returning the front element.

Answer : Enqueue is the process that places data at the back of the queue. Answer : Data stored in a queue is actually stored in an array.

Knowing how to store data and manipulate the same easily will give programmers an edge over the competition. Data structures are used across the world in almost every aspect of data storage one can think of. This means that the questions you might find in an interview can be challenging. Data Structures are extremely integral in a variety of fields. Companies across the globe invest in millions of dollars to fully integrate their data handling systems with efficient data structures rather than conventional methods. Be it a start-up or a well established giant, all of the companies require the usage of Data Structures and this makes it very important for you to understand and analyse the top Data Structures Interview Questions and Answers. What are Data Structures?

Are you searching for Data Structures job? A Data Structure in computer science is a kind of managing and storing data in order to access it efficiently. Implementing data structures requires writing a set of procedures that are used in creating and managing instances of that structure. Job opportunities are present everywhere for this position. Wisdomjobs created interview questions exclusively for the candidates who are in search of job.

Array and list are example of linear data structure. What are common operations that can be performed on a data-structure? The following operations are.

### Top 50 Data Structures Interview Questions

It seeks to find ways to make data access more efficient. When dealing with the data structure, we not only focus on one piece of data but the different set of data and how they can relate to one another in an organized manner. The key difference between both the data structure is the memory area that is being accessed. When dealing with the structure that resides the main memory of the computer system, this is referred to as storage structure.

A list of most frequently asked Data Structure interview questions and answers are given below. The data structure is a way that specifies how to organize and manipulate the data. It also defines the relationship between them.

A data structure is the method of arrangement of data in the computer for ease of storage and retrieval. It provides an efficient way to manage a large amount of data.

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