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898 B

package mergesorted
type ListNode struct {
Val int
Next *ListNode
}
func reverse(list *ListNode) *ListNode {
var result *ListNode
for list != nil {
result = &ListNode{Val: list.Val, Next: result}
list = list.Next
}
return result
}
func mergeTwoLists(list1 *ListNode, list2 *ListNode) *ListNode {
var result *ListNode
for list1 != nil || list2 != nil {
if list1 == nil {
result = &ListNode{Val: list2.Val, Next: result}
list2 = list2.Next
} else if list2 == nil {
result = &ListNode{Val: list1.Val, Next: result}
list1 = list1.Next
} else if list1.Val < list2.Val {
result = &ListNode{Val: list1.Val, Next: result}
list1 = list1.Next
} else {
result = &ListNode{Val: list2.Val, Next: result}
list2 = list2.Next
}
}
return reverse(result)
}
func MergeTwoLists(list1 *ListNode, list2 *ListNode) *ListNode {
return mergeTwoLists(list1, list2)
}