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solution.go
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solution.go
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package main
import "fmt"
// ListNode is a singly-linked list.
type ListNode struct {
Val int
Next *ListNode
}
func oddEvenList(head *ListNode) *ListNode {
// no need to modify the list
if head == nil || head.Next == nil {
return head
}
// odd and even pointer
odd, even := head, head.Next
// odd and even head
oddHead, evenHead := odd, even
for even != nil && even.Next != nil {
odd.Next = even.Next
odd = odd.Next
even.Next = odd.Next
even = even.Next
}
odd.Next = evenHead
return oddHead
}
func main() {
head := &ListNode{2, &ListNode{1, &ListNode{3, &ListNode{5, &ListNode{6, &ListNode{4, &ListNode{7, nil}}}}}}}
result := oddEvenList(head)
for i := result; i != nil; i = i.Next {
fmt.Println(i.Val)
}
}