题目
代码语言：javascript复制/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* swapPairs(ListNode* head) {
ListNode* res = head;
ListNode* term = res;
while(head!=NULL)
{
if(head->next!=NULL)
{
ListNode* temp = head->next;
head->next = temp->next;
temp->next = head;
term->next = temp;
term=head;
head=head->next;
}
else
break;
}
return res;
}
};
