Sunday, Nov 18th

Last update12:59:40 PM GMT

Write a C program to remove duplicates from a sorted linked list

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As the linked list is sorted, we can start from the beginning of the list and compare adjacent nodes. When adjacent nodes are the same, remove the second one. There's a tricky case where the node after the next node needs to be noted before the deletion.

// Remove duplicates from a sorted list
void RemoveDuplicates(struct node* head) 
{
 struct node* current = head;
 if (current == NULL) return; // do nothing if the list is empty

 // Compare current node with next node
 while(current->next!=NULL) 
 {
 if (current->data == current->next->data) 
 {
 struct node* nextNext = current->next->next;
 free(current->next);
 current->next = nextNext;
 }
 else 
 {
 current = current->next; // only advance if no deletion
 }
 }
}
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