关于leetcode个人解题总结:刷题13两两交换链表中的节点

24. 两两替换链表中的节点

1.双指针法

class Solution {    public ListNode swapPairs(ListNode head) {        ListNode pre = new ListNode(-1,head),temp = pre;                while(temp.next != null && temp.next.next != null){            ListNode first = temp.next;            ListNode second = temp.next.next;            first.next = second.next;            second.next = first;            temp.next = second;            temp = first;                       }        return pre.next;    }}