题目
将链表反转输出
解决思路如下:
创建两个链表,pre指向当前结点的上一个结点,next指向当前结点的下一个结点,遍历整个链表,将链表进行反转
/*
public class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}*/
public class Solution {
public ListNode ReverseList(ListNode head) {
if(head==null||head.next==null){
return head;
}
ListNode pre = null;
ListNode next = null;
while(head!=null){
next = head.next;
head.next = pre;
pre = head;
head = next;
}
return pre;
}
}
题目来源:牛客网
更好的解析:https://www.nowcoder.com/practice/75e878df47f24fdc9dc3e400ec6058ca?tpId=13