Doubly Linked List | Set 1 (Introduction and Insertion)We strongly recommend to refer following post as a prerequisite of this post. Show
Following is representation of a DLL node in C language. C++
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Following are advantages/disadvantages of doubly linked list over singly linked list. Disadvantages over singly linked list Recommended: Please solve it on “PRACTICE” first, before moving on to the solution. 1) Add a node at the front: (A 5 steps process) Following are the 5 steps to add node at the front. C++
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Four steps of the above five steps are same as the 4 steps used for inserting at the front in singly linked list. The only extra step is to change previous of head. C++
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Five of the above steps step process are same as the 5 steps used for inserting after a given node in singly linked list. The two extra steps are needed to change previous pointer of new node and previous pointer of new node’s next node. Following are the 7 steps to add node at the end. C++
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Six of the above 7 steps are same as the 6 steps used for inserting after a given node in singly linked list. The one extra step is needed to change previous pointer of new node. Steps
Below is the implementation of the above approach: Code block Output: Created DLL is: Traversal in forward Direction 9 1 5 7 6 Traversal in reverse direction 6 7 5 1 9 A complete working program to test above functions. C++
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Output: Created DLL is: Traversal in forward Direction 1 7 5 8 6 4 Traversal in reverse direction 4 6 8 5 7 1Also see: Delete a node in double Link List
Article Tags :
Data Structures Linked List
doubly linked list Visa Practice Tags :
Visa Data Structures Linked List Insertion in doubly linked list at beginningAs in doubly linked list, each node of the list contain double pointers therefore we have to maintain more number of pointers in doubly linked list as compare to singly linked list. There are two scenarios of inserting any element into doubly linked list. Either the list is empty or it contains at least one element. Perform the following steps to insert a node in doubly linked list at beginning.
Since, the node being inserted is the first node of the list and therefore it must contain NULL in its prev pointer. Hence assign null to its previous part and make the head point to this node. 1. Inserting a node at the beginning of the circular doubly linked list needs to modify ______... 1 answer below »1. Inserting a node at the beginning of the circular doubly linked list needs to modify ______ pointers. 2. Deleting a node from the beginning of the singly linked list needs to modify ______ pointers 3. Deleting a node from the middle of the doubly linked list needs to modify ______ pointers Inserting a node at the beginning of a linked listThe new node will be added at the beginning of a linked list. ExampleAssume that the linked list has elements: 20 30 40 NULL If we insert 100, it will be added at the beginning of a linked list. After insertion, the new linked list will be 100 20 30 40 NULL inserting a node at the end of a linked listThe new node will be added at the end of the linked list. |