leetcode 83:删除排序链表中的重复元素
ListNode *deleteDuplications(ListNode* head){
if(head==NULL)return head;
ListNode *l1=new ListNode(0);
ListNode *l2=l1;
l1->next=new ListNode(head->val);
head=head->next;
l1=l1->next;
while(head!=NULL){
if(l1->val==head->val){
head=head->next;
}else{
l1->next=new ListNode(head->val);
l1=l1->next;
head=head->next;
}
}
return l2->next;
}