{ int data;s struct Node *next; struct Node *prev; }; // Function to insert at the end void insertEnd(struct Node** start, int value) { // If the list is empty, create a single node // circular and doubly list if (*start == NULL)
#include <bits/stdc++.h>
using namespace std;
// Structure of a Node
struct Node
{
int data;s
struct Node *next;
struct Node *prev;
};
// Function to insert at the end
void insertEnd(struct Node** start, int value)
{
// If the list is empty, create a single node
// circular and doubly list
if (*start == NULL)
{
struct Node* new_node = new Node; new_node->data = value;
new_node->next = new_node->prev = new_node;
*start = new_node;
return;
}
// If list is not empty
/* Find last node */
Node *last = (*start)->prev;
// Create Node dynamically
struct Node* new_node = new Node;
new_node->data = value;
// Start is going to be next of new_node
new_node->next = *start;
// Make new node previous of start
(*start)->prev = new_node;
// Make last preivous of new node
new_node->prev = last;
// Make new node next of old last
last->next = new_node;
}
// Function to insert Node at the beginning
// of the List,
void insertBegin(struct Node** start, int value)
{
// Pointer points to last Node
struct Node *last = (*start)->prev;
struct Node* new_node = new Node;
new_node->data = value; // Inserting the data
// setting up previous and next of new node
new_node->next = *start;
new_node->prev = last;
// Update next and previous pointers of start
// and last.
last->next = (*start)->prev = new_node;
// Update start pointer
*start = new_node;
}
// Function to insert node with value as value1.
// The new node is inserted after the node with
// with value2
void insertAfter(struct Node** start, int value1,int value2)
{
struct Node* new_node = new Node;
new_node->data = value1; // Inserting the data
// Find node having value2 and next node of it
struct Node *temp = *start;
while (temp->data != value2)
temp = temp->next;
struct Node *next = temp->next;
...
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