Linked List In Data Structure Interview Questions And Answers Pdf

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What is a Data Structure? A data structure is a way of organizing the data so that the data can be used efficiently. Different kinds of data structures are suited to different kinds of applications, and some are highly specialized to specific tasks. For example, B-trees are particularly well-suited for the implementation of databases, while compiler implementations usually use hash tables to look up identifiers.

300+ TOP DATA STRUCTURES Interview Questions and Answers pdf

A list of top frequently asked Linked List Interview Questions and answers are given below. A linked list may be defined as a linear data structure which can store a collection of items.

In another way, the linked list can be utilized to store various objects of similar types. Each element or unit of the list is indicated as a node. Each node contains its data and the address of the next node. It is similar to a chain. Linked lists are used to create graphs and trees. A linked list may be defined as a data structure in which each element is a separate object.

Linked list elements are not kept at the contiguous location. The pointers are used to link the elements of the Linked List. Each node available in a list is made up of two items- the data itself and a reference also known as a link to the next node in the sequence.

The last node includes a reference to null. The starting point into a linked list is known as the head of the list. It should be noted that the head is a reference to the first node, not a separate node. The head is considered as a null reference if the list is empty. The singly linked list includes nodes which contain a data field and next field.

The next field further points to the next node in the line of nodes. In other words, the nodes in singly linked lists contain a pointer to the next node in the list. We can perform operations like insertion, deletion, and traversal in singly linked lists.

A singly linked list is shown below whose nodes contain two fields: an integer value and a pointer value a link to the next node. The doubly linked list includes a pointer link to the next node as well as to the previous node in the list. The two links between the nodes may be called "forward" and "backward, "or "next" and "prev previous.

A technique known as XOR-linking is used to allow a doubly-linked list to be implemented with the help of a single link field in each node. However, this technique needs more ability to perform some operations on addresses, and therefore may not be available for some high-level languages. Most of the modern operating systems use doubly linked lists to maintain references to active threads, processes, and other dynamic objects.

In a multiply linked list, each node consists of two or more link fields. Each field is used to join the same set of records in a different order of the same set, e. In the last node of a linked list, the link field often contains a null reference.

Instead of including a null pointer at the end of the list, the last node in circular linked lists includes a pointer pointing to the first node. In such cases, the list is said to be? In case of a circular doubly linked list, the first node also points to the last node of the list.

The simplest method to represent a linked list node is wrapping the data and the link using typedef structure. Then further assigning the structure as a Node pointer that points to the next node. Both queues and stacks can be implemented using a linked list. Some of the other applications that use linked list are a binary tree, skip, unrolled linked list, hash table, etc. Doubly linked list nodes consist of three fields: an integer value and two links pointing to two other nodes one to the last node and another to the next node.

The main advantage of a linked list is that we do not need to specify a fixed size for the list. The more elements we add to the chain, the bigger the chain gets.

This case is a little bit difficult as it depends upon the type of implementation. If we have a tail pointer, then it is simple. In case we do not have a tail pointer, we will have to traverse the list until we reach to the end i. Then we need to create a new node and make that last node? If we want to insert a node in the first position or an empty list, we can insert the node easily. Otherwise, we need to traverse the list until we reach the specified position or at the end of the list. Then we can insert a new node.

Inserting a node in the middle position is a little bit difficult as we have to make sure that we perform the pointer assignment in the correct order.

To insert a new node in the middle, follow the steps:. To delete the first node from the singly linked list, we need to follow below steps:. If a node that we want to delete is a root node, we can delete it easily. To delete a middle node, we must have a pointer pointing to that node which is present before the node that we want to delete. So if the position is non-zero, then we run a position loop and get a pointer to the previous node. The steps given below are used to delete the node from the list at the specified position:.

To reverse the singly linked list, we are required to iterate through the list. We need to reverse the link at each step like after the first iteration, the head will point to null, and the next element will point to the head.

At the end of traversal when we reach the tail of the linked list, the tail will start pointing to the second last element and will become a new head. It is because we can further traverse through all the elements from that particular node. A linked list can also be reversed by using recursion which eliminates the use of a temporary variable. The main concept to detect and remove a loop in a linked list is to use two pointers one slow pointer and a fast pointer.

The slow pointer traverses single node at a time, whereas the fast pointer traverses twice as fast as the first one.

If the linked list contains loop in it, the fast and slow pointer will be at the same node. On the other hand, if the list doesn't consist loop in it, obviously the fast pointer will reach the end before the slow pointer does.

A loop is detected if these two pointers ever met. If the loop is detected, the start of the loop can help us remove the detected loop in the linked list. It is called Floyd's Cycle-Finding Algorithm.

The given diagram shows how a loop looks like in a linked list:. Double linked lists need more space for each node in comparison to the singly linked list. In a doubly linked list, the elementary operations such as insertion and deletion are more expensive, but they are easier to manipulate because they provide quick and easy sequential access to the list in both the directions.

But, doubly linked lists cannot be used as persistent data structures. Hence, the doubly linked list would be a better choice for traversing through a list of the node.

If a new node is inserted in a linked list, the free node is found in Avail List. There are several ways to traverse a linked list in Java, e. Alternatively, we can use enhanced for loop of Java 1. From JDK 8 onwards, we have an option to use java. Stream for traversing a linked list. We can iterate over the linked list and keep a count of nodes until we reach the end of the linked list where the next node will be null.

The value of the counter is considered as the length of the linked list. To calculate the sum of the linked lists, we calculate the sum of values held at nodes in the same position. For example , we add values at first node on both the linked list to find the value of the first node of the resultant linked list. If the length of both linked lists is not equal, then we only add elements from the shorter linked list and copy values for remaining nodes from the long list.

JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. All Interview. There are generally three types of pointers required to implement a simple linked list: A 'head' pointer which is used for pointing to the start of the record in a list. A 'tail' pointer which is used for pointing to the last node.

The key factor in the last node is that its subsequent pointer points to nothing NULL. A pointer in every node which is used for pointing to the next node element. Javatpoint Services JavaTpoint offers too many high quality services. Dynamic memory allocation is referred for Linked List. The term 'traversal' refers to the operation of processing each element present in the list. Linked List Linear Array Deletion and insertion are easy. To reach a particular node, we need to go through all the nodes that come before that particular node.

Java Linked List Interview Questions [Top 20]

Here you will get some basic and advance linked list interview questions and answers. Linked lists happen to have very complex interview questions. Your code solutions that include linked listings are speedy and smaller. What is a Linked list? Linked list is an ordered set of data elements, each containing a link to its successor and typically its predecessor.

Linear: A data structure is said to be linear if its elements form a sequence or a linear list. Examples: Array. Linked List, Stacks and Queues.

Linked List

Are you confused about selecting a job? Do you want to know which field best suits your talents? Wisdom jobs is all about training people to find better jobs that improve their skills. A linked list is defined as a data structure that is formed by linearly collecting data elements but each element is defined as a separate object node. Each node consists of two items- one is data and the other is a reference to next object.

A linked list is a data structure that can store a collection of items. In other words, linked lists can be utilized to store several objects of the same type.

All articles on Linked Lists. This article is contributed by Ayushmaan Bansal. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.

What are the major data structures used in the following areas : Rdbms, network data model and Hierarchical data model. If you are using c language to implement the heterogeneous linked list, What pointer type will you use? It is not possible to use ordinary pointers for this. Void pointer is capable of storing pointer to any type as it is a generic pointer type.

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    Company Preparation · Top Topics · Practice Company Questions · Interview Experiences · Experienced Interviews · Internship Top 20 Linked List Interview Question 'Quiz' on Linked List Write a function to reverse the nodes of a linked list. Data Structures and Algorithms – Self Paced Course.