/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
public class Solution {
public ListNode reverseList(ListNode head) {
ListNode pre=null;
while(head!=null){
ListNode tmp=head.next;
head.next=pre;
pre=head;
head=tmp;
}
return pre;
}
}
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