C++ 6ms Recursive clean solution

  • 1
    ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) {
            ListNode* result = NULL;
            if(l1 == NULL) return l2;
            if(l2 == NULL) return l1;
            if(l1->val <= l2->val){
                result = l1;
                result->next = mergeTwoLists(l1->next, l2);
                result = l2;
                result->next = mergeTwoLists(l1, l2->next);
    return result;

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