doubly-linked-list

问题 I am trying to swap two nodes in a doubly linked list. Below is the part of program having swap function. int swap (int x, int y) { struct node *temp = NULL ; struct node *ptr1, *ptr2; temp = (struct node *)malloc(sizeof(struct node)); if (head == NULL ) { printf("Null Nodes"); } else { ptr1 = ptr2 = head; int count = 1; while (count != x) { ptr1 = ptr1->next; count++; } int count2 = 1; while (count2 != y) { ptr2 = ptr2->next; count2++; } ptr1->next->prev = ptr2; ptr1->prev->next = ptr2; ptr2

问题 I have an array of objects of the following type: struct Node { Node *_pPrev, *_pNext; double *_pData; }; Some of the nodes participate in a doubly-linked list, with _pData!=nullptr for such nodes. There is also a dummy head node with _pNext pointing to the beginning of the list, and _pPrev pointing to the end. The list starts with containing only this head node, and it should be never removed from the list. The doubly-linked list is backed by an array, with initial size equal to the maximum

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 3 years ago . I have this code public class Doublylinkedlist { private DLLNode head; private DLLNode tail; private int length; } What is this DLLNode head declaration? What data type it is? Can someone please explain? Here is the DLLNode class Public class DLLNode{ private int data ; private DLLNode prev;

问题 I am trying to create 2d doubly linked circular array, reading data from a txt file and creating nodes automatically. My program is reading the first line properly, but when it reaches next line and time to create next node, null pointer occurs. I dont understand why it is happening please help me. public class project1 { public static void main(String[] args) { File file = new File("Input0.txt"); List mList = new List(); try { Scanner sc = new Scanner(file); while (sc.hasNextLine()) { String

问题 As a whole my program is for inserting and deleting nodes in a sorted doubly linked list. Insertion works and deleting the first node from the linked list works fine, except deleting the last node. Also, deleting nodes in the middle and end don't work. If I try to delete the last node, I am led back to main(); If I try deleting a node in the middle, the program crashes. Your help is appreciated! void remove(int n){ struct node* help = head; if(head->data == n){ if (head->next) help->next-

问题 I'm working on coding some data structures on my own time. I've noticed that the clone method is not copying the list as I expect. I'll post my results underneath the code as the main method is near the bottom of the class. Here is the class I have written so far: public class DoublyLinkedList<E> implements Cloneable { //------------nested Node class------------ private static class Node<E> { private E element; // reference to stored element private Node<E> prev; // reference to previous

问题 I need help with my add method in java. It works with DoublyLinked List. I am implementing a cyclic DoublyLinkedList data structure. Like a singly linked list, nodes in a doubly linked list have a reference to the next node, but unlike a singly linked list, nodes in a doubly linked list also have a reference to the previous node. Additionally, because the list is "cyclic", the "next" reference in the last node in the list points to the first node in the list, and the "prev" reference in the

问题 //I have a single linked list that looks like this node head = new Node (); head.info = 3; head.next = new Node (); head.next.info = 6 (); head.next.next = new Node (); head.next.next.info = 9; head.next.next.next = null; //How would I write a double linked list? class Double Node { info; doubleNode prev; doubleNode next; } 回答1: Here is the part for creating a double linked list and adding nodes to it. You can update it by adding remove and insert functions as you want. class Node{ Node prev;

问题 I am trying to create a doubly linked list: class DblLinkedBag { private: struct node{ string data; node* next; node* prev; }*start=NULL; int itemCount; string item; node *head; node *tail; public: DblLinkedBag(); ~DblLinkedBag(); int getCurrentSize(); bool isEmpty(); string add(string value); bool remove(string item); void clear(); bool contains(string target); int getFrequencyOf(); string toVector(); string getItem(); void display(); }; So far, I have gotten add, isEmpty, getCurrentSize and

问题 This LinkedList function uses a very dodgy method to avoid client code needing to know about the linking nodes. Each list creates a unique string which is used to intrusively insert properties into the objects being added to the list. Does anyone know of a better way to do this? I should mention that removing objects in constant time is a requirement. It does mean that client code looks like: var myList = new LinkedList() var a = new Something() var b = new SomethingElse() myList.addTail(a)