题解 | 反转链表
反转链表
https://www.nowcoder.com/practice/75e878df47f24fdc9dc3e400ec6058ca
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 ReverseList (ListNode head) {
// write code here
if(head ==null || head.next ==null){
return head;
}
ListNode pre =null;
ListNode cur = head;
ListNode next = null;
while(cur !=null){
next = cur.next;
cur.next = pre;
pre = cur;
cur = next;
}
return pre;
}
}
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