21.Merge Two Sorted Lists

題目鏈接：題目鏈接

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:

Input: 1->2->4, 1->3->4 Output: 1->1->2->3->4->4

解題代碼：

golang語言

/*** Definition for singly-linked list.* type ListNode struct {* Val int* Next *ListNode* }*/ func mergeTwoLists(l1 *ListNode, l2 *ListNode) *ListNode {var head *ListNodeif l1==nil && l2==nil{return l1}if l1!=nil && l2==nil{ head=l1l1=l1.Next}if l2!=nil && l1==nil{ head=l2l2=l2.Next}if l2!=nil && l1!=nil{ if l1.Val<l2.Val{head=l1l1=l1.Next}else {head=l2l2=l2.Next}}var pre *ListNode=headvar node *ListNodefor l1!=nil &&l2!=nil {if l1.Val<l2.Val{node=l1l1=l1.Next}else {node=l2l2=l2.Next}pre.Next=nodepre=node}if l1!=nil {node=l1pre.Next=nodepre=nodel1=l1.Next}if l2!=nil {node=l2pre.Next=nodepre=nodel2=l2.Next}return head}

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