题解 | #反转链表#

import java.util.*;

public class Solution {

    public ListNode ReverseList (ListNode head) {
        ListNode prev = null;
        ListNode curr = head;
        ListNode next = null;
        while (curr != null) {
            next = curr.next;
            curr.next = prev;
            prev = curr;
            curr = next;
        }
        return prev;
    }
}