package q82

type ListNode struct {
	Val  int
	Next *ListNode
}

func deleteDuplicates(head *ListNode) *ListNode {
	root := ListNode{}
	last := &root

	c := head
	for c != nil {
		if c.Next != nil && c.Next.Val == c.Val {
			dupVal := c.Val
			for c != nil && c.Val == dupVal {
				c = c.Next
			}
			continue
		}
		last.Next = c
		last = c
		c = c.Next
		last.Next = nil
	}
	return root.Next
}

var _ = deleteDuplicates