Sorted insert for circular linked list | GeeksforGeeks


Write a C function to insert a new value in a sorted Circular Linked List (CLL). 

1) Linked List is empty:  
    a)  since new_node is the only node in CLL, make a self loop.      
          new_node->next = new_node;  
    b) change the head pointer to point to new node.
          *head_ref = new_node;
2) New node is to be inserted just before the head node:    
  (a) Find out the last node using a loop.
         while(current->next != *head_ref)
            current = current->next;
  (b) Change the next of last node. 
         current->next = new_node;
  (c) Change next of new node to point to head.
         new_node->next = *head_ref;
  (d) change the head pointer to point to new node.
         *head_ref = new_node;
3) New node is to be  inserted somewhere after the head: 
   (a) Locate the node after which new node is to be inserted.
         while ( current->next!= *head_ref && 
             current->next->data < new_node->data)
         {   current = current->next;   }
   (b) Make next of new_node as next of the located pointer
         new_node->next = current->next;
   (c) Change the next of the located pointer
         current->next = new_node;
void sortedInsert(struct node** head_ref, struct node* new_node)
{
  struct node* current = *head_ref;
  // Case 1 of the above algo
  if (current == NULL)
  {
     new_node->next = new_node;
     *head_ref = new_node;
  }
  // Case 2 of the above algo
  else if (current->data >= new_node->data)
  {
    /* If value is smaller than head's value then
      we need to change next of last node */
    while(current->next != *head_ref)
        current = current->next;
    current->next = new_node;
    new_node->next = *head_ref;
    *head_ref = new_node;
  }
  // Case 3 of the above algo
  else
  {
    /* Locate the node before the point of insertion */
    while (current->next!= *head_ref && current->next->data < new_node->data)
      current = current->next;
    new_node->next = current->next;
    current->next = new_node;
  }
}
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