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()
}