package two

const empty = -1

type block struct {
	used   int
	free   []int
	offset int
}

func newBlock(used, start, end int) block {
	return block{
		used:   used,
		free:   []int{start, start + end},
		offset: 0,
	}
}

func (b *block) available() int {
	return b.free[1] - b.free[0]
}