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- ListNode* swapPairs(ListNode* head){
- ListNode* temp = head;
- ListNode* temp2;
- if(head->next != NULL){
- head = head->next;
- temp->next = head->next;
- head->next = temp;
- }
- while(temp != NULL){
- if(temp->next != NULL && temp->next->next != NULL){
- temp2 = temp->next;
- temp->next = temp2->next;
- temp = temp->next;
- temp2->next = temp->next;
- temp->next= temp2;
- }
- temp = temp->next;
- }
- return head;
- }
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