题解 | #删除有序链表中重复的元素-I#
删除有序链表中重复的元素-I
https://www.nowcoder.com/practice/c087914fae584da886a0091e877f2c79
import java.util.*;
/*
* public class ListNode {
* int val;
* ListNode next = null;
* public ListNode(int val) {
* this.val = val;
* }
* }
*/
public class Solution {
/**
* 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
*
*
* @param head ListNode类
* @return ListNode类
*/
public ListNode deleteDuplicates (ListNode head) {
if (head == null || head.next == null) {
return head;
}
// 记录删减后的节点
ListNode res = new ListNode(-101);
// 记录前一个节点
ListNode dump = res;
while (head != null) {
int dumpValue = dump.val;
int headValue = head.val;
ListNode next = head.next;
head.next = null;
// 当前节点和上一个节点值不相等，添加到上一个节点后面
if (dumpValue != headValue) {
dump.next = head;
dump = dump.next;
}
head = next;
}
return res.next;
}
}
