JZ56 删除链表中重复的结点

/*
 public class ListNode {
    int val;
    ListNode next = null;

    ListNode(int val) {
        this.val = val;
    }
}
*/
public class Solution {
    public ListNode deleteDuplication(ListNode pHead) {
        ListNode first = new ListNode(-1);
        first.next = pHead;

        ListNode pre = first;
        ListNode cur = pHead;
        while(cur != null){
            if (cur.next !=null && cur.val == cur.next.val){
                while(cur.next !=null &&cur.val == cur.next.val){
                    cur = cur.next;
                }
                pre.next = cur.next;
                cur = cur.next;
            }else{
                pre = cur;
                cur = cur.next;
            }
        }

        return first.next;

    }
}