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 || pHead.next == null)
return pHead;
ListNode head = new ListNode(-1);
head.next = pHead;
ListNode first = head;
ListNode second = first.next;
while(second != null){
if(second.next != null && second.val == second.next.val){
while(second.next != null && second.val == second.next.val){
second = second.next;
}
first.next = second.next;
}else{
first = first.next;
}
second = second.next;
}
return head.next;
}
}