1.声明一个新链表l;2.判空l1和l2,有空就返回另一个链表;3.对比l1和l2的第一个节点数值,把数值小的加入新链表l;4.重复执行3,直到有一个链表为空,把非空链表加入l5.返回。 代码 class Solution { public: ListNode*mergeTwoLists(ListNode* l1, ListNode* l2) { ListNode* preHead = newListNode(-1);...
# class ListNode: # def __init__(self, val=0, next=None): # self.val = val # self.next = next class Solution: def mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) -> Optional[ListNode]: # 使用一个哨兵结点 head_pre ,方便后续处理 head_pre: Optional[ListN...
因为每次调用递归都会去掉list1或者list2的头节点(直到至少有一个链表为空),函数mergeTwoList至多只会递归调用每个节点一次,时间复杂度取决于合并后的链表长度。 空间复杂度:O(n+m),其中 n 和 m 分别为两个链表的长度。递归调用mergeTwoLists函数时需要消耗栈空间,栈空间的大小取决于递归调用的深度。结束递归调用...
res.next= l2;//这里是res.next,不是res}returnhead.next;//因为初始化时候设置初始节点为0,l1和l2的节点从第二个开始}//递归publicListNode mergeTwoLists(ListNode l1, ListNode l2){if(l1 ==null){returnl2; }if(l2 ==null){returnl1; }if(l1.val <l2.val){ l1.next=mergeTwoLists(l1.next,l2...
ret.next=self.mergeTwoLists(l1.next,l2)else:ret=l2 ret.next=self.mergeTwoLists(l2.next,l1)returnret 结果:AC 四、学习与记录 这个其实算是一个归并排序: 归并排序(MERGE-SORT)是建立在归并操作上的一种有效的排序算法,该算法是采用分治法(Divide and Conquer)的一个非常典型的应用。将已有序的子序列...
输入:1->2->4,1->3->4输出:1->1->2->3->4->4 二、代码实现 # Definition for singly-linked list.# class ListNode(object):# def __init__(self, x):# self.val = x# self.next = NoneclassSolution(object):defmergeTwoLists(self,l1,l2):""" ...
If you click Squash, by default the messages from the two commits will be combined, so if you don't modify the resulting commit message this action will be reflected in the branch history. If you click Fixup, the commit message of the fixup commit will be discarded, so this change will...
There are two versions of the ASP.NET Merge tool:The version that is provided with the .NET Framework 2.0. This version works only with assemblies that are created by the .NET Framework 2.0 version of the ASP.NET Compilation tool. Use this version for Web applications that are deployed in...
There are two versions of the ASP.NET Merge tool:The version that is provided with the .NET Framework 2.0. This version works only with assemblies that are created by the .NET Framework 2.0 version of the ASP.NET Compilation tool. Use this version for Web applications that are deployed in...
def mergeTwoLists(self, l1, l2): """ :type l1: ListNode :type l2: ListNode :rtype: ListNode """ if not l1: return l2 elif not l2: return l1 else: if l1.val <= l2.val: l1.next = self.mergeTwoLists(l1.next,l2) return l1 else: l2.next = self.mergeTwoLists(l1,l2.next...