题解 | #小球走过路程计算#

import java.util.Scanner;
import static java.lang.Math.pow;
public class Main {
    public static void main(String[] args) {
    double h = 0;
    int n = 0;
    Scanner scan = new Scanner(System.in);
    h = scan.nextDouble();
    n = scan.nextInt();
    int i = 0;
    double sum = 0,x =0;
    for(i = 0;i<n;i++)
    {
        if(i == 0)
        {
            sum += h;
            x = h/2;
        }
        else
        {
            sum+=(h/pow(2,(double)i-1));
            x = h/(pow(2,(double)i+1));
        }
    }
    System.out.println(String.format("%.3f",x)+" "+String.format("%.3f",sum));
}
        

    }