Insert the elements 18, 23, 8, 12, 10, 14, 19, 27, 44, 4, 21, 36, 14, 22, 91, 8, 22, 81, 10 into the following linked list 4, 21, 36, 14, 62, 91, 8, 22, 81, 10.

1. Initialize two pointers:

   • current: This pointer will be used to traverse the existing linked list and find the appropriate insertion points.
   • new_node: This pointer will point to the new node being inserted.

2. Create a new node for each element that needs to be inserted:

   • Allocate memory for the new node.
   • Set the value of the new node to the element being inserted.
   • Set the next pointer of the new node to nullptr.

3. Traverse the existing linked list and find the appropriate insertion point:

   • Start from the head of the linked list.
   • Use the current pointer to traverse the linked list.
   • Compare the value of the new_node with the value of the current node pointed by current.
   • If the value of the new_node is less than or equal to the value of the current node, then the new node should be inserted before the current node.
   • If the value of the new_node is greater than the value of the current node, then move the current pointer to the next node and repeat the comparison.
   • Continue this process until the appropriate insertion point is found.

4. Insert the new node into the linked list:

   • If the new node is being inserted at the beginning of the linked list (i.e., before the head node), then set the next pointer of the new node to the current head node and make the new node as the new head node.
   • If the new node is being inserted in the middle or at the end of the linked list, then set the next pointer of the new node to the current node pointed by the current pointer and set the next pointer of the previous node (i.e., the node before the current node) to the new node.

5. Repeat steps 2-4 for all the remaining elements that need to be inserted.

Here's an example of how to insert the element 18 into the linked list using this method:

// Initialize the new node
struct Node* new_node = new Node;
new_node->data = 18;
new_node->next = nullptr;

// Find the appropriate insertion point
struct Node* current = head;
while (current->next != nullptr && current->next->data < 18) {
    current = current->next;
}

// Insert the new node into the linked list
if (current == head) {
    // Insert at the beginning of the linked list
    new_node->next = head;
    head = new_node;
} else {
    // Insert in the middle or at the end of the linked list
    new_node->next = current->next;
    current->next = new_node;
}

Repeat this process for all the remaining elements that need to be inserted.