83. 删除排序链表中的重复元素

class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        if(!head||!head->next) return head;
        ListNode*cur=head;
        while(cur->next)
        {
            if(cur->val==cur->next->val)
            {
                cur->next=cur->next->next;
            }
            else
            {
                cur=cur->next;
            }
            
        }
        return head;
    }
};