题解 | #反转链表#

/*
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 cur=head;
        while(cur!=null){
            ListNode curNext=cur.next;
            cur.next=prev;
            prev=cur;
            cur=curNext;
        }
        return prev;
    }
}