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();

        //write your code here......
        //100 50 25 12.5 ==> h反弹=h*(1/2)n次方
        //100 50*2 25*2  ==> sum=h+h+(h/2)==>等比数列求和
        float h2=h;
        for(int a=0;a<n;a++){
            h2=h2/2;

        }
        float sum=2*h;
        for(int i=2;i<n;i++){
            h=h/2;
            sum=sum+h;

        }
        System.out.println(String.format("%.3f", h2)+" "+String.format("%.3f", sum));
        

        //输出格式为：System.out.println(String.format("%.3f", h)+" "+String.format("%.3f", sum));
        

    }
}