python doubly linked list - insertAfter node

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By : mrz

Date : January 12 2021, 08:33 AM

this one helps. Im creating a python class to implement a doubly linked list. I have a seperate class for the DLL node itself and a class for the list. This is my class for the DLL nodes: class DLLNode: , In the loop

code :

while iterator._next is not None:

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Creating a Doubly Linked List inside another Doubly Linked Lists using Structures

By : D.Song

Date : March 29 2020, 07:55 AM

I wish did fix the issue. You are assigning a pointer of type "friendt" to "friendh".
newNode -> friendh -> next // is a pointer of type friendh. You are assigning it a pointer of type friendt.

doubly linked list adding node at end just shows first and last node only on printf

By : Rodrigo AIS

Date : March 29 2020, 07:55 AM

I think the issue was by ths following , I am trying to create a doubly linked list, I have successfully done insertion at begining but not at end.

code :

insert_at_end(int data, node * * head) //Where data is the data to be kept it in it's Info part.
{
    node * temp,*temp2= *head;
    if(temp2==NULL)
    { 
        temp2 = (node * ) malloc(sizeof(node));
        temp2 -> freq = data;
        temp2 -> next = NULL; 
        temp2 -> prev = *head; 
        * head = temp2;
    }
    else
    {
        temp = (node * ) malloc(sizeof(node));
        temp -> freq = data;
        temp -> next = NULL; 
        while((temp2)->next!=NULL) //for moving  to the end point
              temp2=(temp2)->next; 
        temp -> prev = temp2;

        temp2->next=temp;
    }
}

Linked List Class in MATLAB - Insert node manually without insertAfter()

By : Katherine MacKenett

Date : March 29 2020, 07:55 AM

hope this fix your issue No, I don't think that would work with just those three lines of code because it ignores all the other logic that occurs to make sure that the Next and Prev are set for newnode and ignores the update to ptrnxt that would need to occur so that its Prev is now newnode. (And the Next property is private so you would have to change that to public…)
It is unclear by what you mean with I cannot use the insertBefore() or insertAfter() in my particular application since I am not maintaining a pointer of the current node. Yet you have the nodes that you want to insert newnode between? I'm guessing that the order of your nodes (prior to the insertion of the new one) is …,ptr,ptrnxt,…. Then why not just use

code :

newnode.insertAfter(ptr);

newnode      = dlnode(new);
ptr.Next     = newnode;
newnode.Prev = ptr;     % to make sure that newnode points back to ptr
newnode.Next = ptrnxt;
ptrnxt.Prev  = newnode; % to make sure that ptrnxt points back to newnode

Python Doubly Linked List Node Removal

By : user3580014

Date : March 29 2020, 07:55 AM

should help you out While the node holds references to the next and previous, it does not have anything pointing to it and is garbage collected like any object in Python. You had to use gc just to check that it was gone for the very reason it had no referrers!

Why adding a node to a doubly linked list deletes all nodes except first node?

By : Ross Newman

Date : March 29 2020, 07:55 AM

I wish this help you I'm using double linked list for keeping 4 different records in c. , There should be a temporary variable for adding situation.

code :

     struct node *temp;

    temp = (struct node*)malloc(sizeof(struct node));
    temp = first_oto;
    while(temp->next!=NULL){
        temp = temp->next;
    }
    temp->next = l;
    l->prev = temp;
    last_oto = l;