题目描述
输入一个链表,反转链表后,输出新链表的表头。
题解
/*
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)
return null;
ListNode newHead = head;
ListNode nextNode = head.next;
head.next = null;
ListNode temp = null;
while(nextNode != null) {
temp = nextNode;
nextNode = nextNode.next;
temp.next = newHead;
newHead = temp;
}
return newHead;
}
}