题目描述
输入一个链表，反转链表后，输出链表的所有元素。
public class Solution {
public ListNode ReverseList(ListNode head) {
if(head==null)
return null;
ListNode pre = null;
ListNode next = null;
while(head!=null){
next = head.next;
head.next = pre;
pre = head;
head = next;
}
return pre;
}
}
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