public class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}
public class Solution {
public ListNode ReverseList(ListNode head) {
ListNode prev=null;
ListNode curr=head;
while(curr!=null){
ListNode temp=curr.next;
curr.next=prev;
prev=curr;
curr=temp;
}
return prev;
}
}