Problem
Given a linked list, swap every two adjacent nodes and return its head.
Example
Given 1->2->3->4, you should return the list as 2->1->4->3.
Solution
/**
* 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 **pp = &head, *a, *b;
while ((a = *pp) && (b = a->next)) {
a->next = b->next;
b->next = a;
*pp = b;
pp = &(a->next);
}
return head;
}
};
