[leetcode]swap-nodes-in-pairs
. - 力扣（LeetCode）
class Solution {
public:ListNode* swapPairs(ListNode* head) {ListNode* dummyHead = new ListNode(0);dummyHead->next = head;ListNode* temp = dummyHead;while (temp->next != nullptr && temp->next->next != nullptr) {ListNode* node1 = temp->next;ListNode* node2 = temp->next->next;temp->next = node2;node1->next = node2->next;node2->next = node1;temp = node1;}ListNode* ans = dummyHead->next;delete dummyHead;return ans;}
};