Very simple C++ recursive solution.


  • 8
    C
    class Solution {
    public:
        ListNode* swapPairs(ListNode* head) {
            if (head == NULL || head->next == NULL) return head;
            ListNode *grandChild = swapPairs(head->next->next);
            ListNode *child = head->next;
            child->next = head;
            head->next = grandChild;
            return child;
        }
    };

  • 0

    This will not be using constant space because of the recursive function calls.


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