删除排序链表中的重复元素

//
// public class ListNode {
// int val;
// ListNode next;
// ListNode(int x) { val = x; }
// }

class Solution {

public ListNode deleteDuplicates(ListNode head) {
      ListNode current = head;
      while (current!=null&&current.next!=null){
          if (current.val==current.next.val){
              current.next=current.next.next;
          }else{
              current=current.next;
          }
      }
      return head;
}

}