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[leetcode-21-Merge Two Sorted Lists]

2024-09-10 23:11:23   218人阅读

Merge two sorted linked lists and return it as a new list.
The new list should be made by splicing together the nodes of the first two lists.

思路：

由于链表是有序的，那么仅需要从两个链表的头开始比较即可。较小者插入新链表，然后向后依次比较。

ListNode* mergeTwoLists(ListNode* l1, ListNode* l2)
    {
        ListNode* dummy = new ListNode(0);
        ListNode* p = dummy ;
        while (l1 != NULL && l2 != NULL)
        {
            if (l1->val < l2->val)
            {
                p->next = l1;
                l1 = l1->next;
            }
            else
            {
                p->next = l2;
                l2 = l2->next;
            }
            p = p->next;             
        }
        if (l1 != NULL)p->next = l1;        
        if (l2 != NULL)p->next = l2;        
        return dummy->next;
    }

 

[leetcode-21-Merge Two Sorted Lists]


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