C# 写 LeetCode easy #21 Merge Two Sorted Lists
2021-06-28 13:08
标签：turn sorted etc var 思想 并且 span == res 21、 Merge Two Sorted Lists 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. Example: 代码： 解析： 输入：两个链表 输出：合并后的链表 思想： 三种情况分别讨论，并且用递归的思想。 时间复杂度：O(n) C# 写 LeetCode easy #21 Merge Two Sorted Lists 标签：turn sorted etc var 思想 并且 span == res 原文地址：https://www.cnblogs.com/s-c-x/p/10043412.htmlInput: 1->2->4, 1->3->4
Output: 1->1->2->3->4->4
public class ListNode
{
public int val;
public ListNode next;
public ListNode(int x) { val = x; }
}
static void Main(string[] args)
{
ListNode l11=new ListNode(1);
ListNode l12 = new ListNode(3);
ListNode l13 = new ListNode(4);
l11.next = l12;
l12.next = l13;
ListNode l21 = new ListNode(2);
ListNode l22 = new ListNode(3);
ListNode l23 = new ListNode(5);
l21.next = l22;
l22.next = l23;
var res=MergeTwoSortedLists(l11, l21);
while (res != null)
{
Console.Write(res.val);
res = res.next;
}
Console.ReadKey();
}
private static ListNode MergeTwoSortedLists(ListNode l1, ListNode l2)
{
if (l1 == null) return l2;
if (l2 == null) return l1;
if (l1.val l2.val)
{
l1.next = MergeTwoSortedLists(l1.next, l2);
return l1;
}
else
{
l2.next = MergeTwoSortedLists(l1, l2.next);
return l2;
}
}
文章标题：C# 写 LeetCode easy #21 Merge Two Sorted Lists
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