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/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode() : val(0), next(nullptr) {} * ListNode(int x) : val(x), next(nullptr) {} * ListNode(int x, ListNode *next) : val(x), next(next) {} * }; */ // 해당 리스트의 짝수까지 개수가 있다면 // 스왑함수로 보내서 스왑을 요청함 class Solution { public: ListNode* swapPairs(ListNode* head) { ListNode* dummy = new ListNode(0); dummy->next = head; ListNode* current = dummy; while(current->next != nullptr && current->next->next != nullptr){ ListNode* first = current->next; ListNode* second = current->next->next; first->next = second->next; second->next = first; current->next = second; current = first; } return dummy->next; } };
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