在一个排序的链表中,存在重复的结点,请删除该链表中重复的结点,重复的结点不保留,返回链表头指针。 例如,链表1->2->3->3->4->4->5 处理后为 1->2->5
/*
public class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}
*/
public class Solution {
public ListNode deleteDuplication(ListNode pHead)
{
if (pHead == null) return null;
ListNode p = pHead;
ListNode n = new ListNode(0);
ListNode pre = n;
n.next = pHead;
boolean flag = false;
while (p != null) {
ListNode q = p.next;
if (q == null) break;
if (q.val == p.val) {
while (q != null && q.val == p.val) {
q = q.next;
}
pre.next = q;
p = q;
} else {
if (!flag) {
n.next = p;
flag = true;
}
pre = p;
p = q;
}
}
return n.next;
}
}