题解 | #小球走过路程计算#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        float h=scanner.nextFloat();
        int n =scanner.nextInt();
        double []s=new double[n];
        double sum=0;
        for(int i=0;i<n;i++)
        {
            if(i==0)
            {
                s[i]=h;
                sum+=h;
            }
            else {
                s[i]=s[i-1]/2;
                sum+=s[i]*2;
            }
            h=h/2;
        }
        System.out.println(String.format("%.3f",h )+" "+String.format("%.3f", sum));


    }
}