package q92

type ListNode struct {
	Val  int
	Next *ListNode
}

func reverseBetween(head *ListNode, left int, right int) *ListNode {
	stub := &ListNode{Next: head}
	before := stub
	for range left - 1 {
		before = before.Next
	}

	curr := before.Next
	for range right - left {
		move := curr.Next
		curr.Next = move.Next
		move.Next = before.Next
		before.Next = move
	}
	return stub.Next
}

var _ = reverseBetween