Remove Duplicates from Sorted List

PROBLEM :

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given 1->1->2,              return 1->2.
Given 1->1->2->3->3,   return 1->2->3.

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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     struct ListNode *next;
 * };
 */
struct ListNode* deleteDuplicates(struct ListNode* head) {
 
        struct ListNode *ptr ,*temp ;
        if(head==NULL)
            return ;
         
        temp=head ;
        while(temp->next!=NULL)
        {
            if(temp->val==temp->next->val)
            {
                ptr=temp->next ;
                temp->next=ptr->next ;
                free(ptr) ;
            }
            else
                temp=temp->next ;
        }
        return head ;
}

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