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......
        float sum = h;
        float stepWay = 0.0f;
        float m=0.0f;
        for(int i=1;i<n;i++) {
            m=h*(float)Math.pow(0.5,i);
            stepWay = 2*m;
            sum+=stepWay;
        }

        System.out.println(String.format("%.3f", 0.5*m)+" "+String.format("%.3f", sum));
        

    }
}