[leetecode ] [C++]83.ove Duplicates from Sorted List

class Solution {
public:
  ListNode* deleteDuplicates(ListNode* head) {
    if(head==NULL)
        return head;
      else{
    ListNode* newlist=new ListNode(head->val);
    ListNode* res_head=newlist;
    while(head!=NULL){
      if(newlist->val==head->val){
        head=head->next;
      }
      else{
        ListNode* tmplist=new ListNode(head->val);
        newlist->next=tmplist;
        newlist=newlist->next;
        head=head->next;
      }
    }
    return res_head;
      }
}
};