题目：

题解：

func optimalDivision(nums []int) string {
    n := len(nums)
    if n == 1 {
        return strconv.Itoa(nums[0])
    }
    if n == 2 {
        return fmt.Sprintf("%d/%d", nums[0], nums[1])
    }
    ans := &strings.Builder{}
    ans.WriteString(fmt.Sprintf("%d/(%d", nums[0], nums[1]))
    for _, num := range nums[2:] {
        ans.WriteByte('/')
        ans.WriteString(strconv.Itoa(num))
    }
    ans.WriteByte(')')
    return ans.String()
}