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();

        float sum=0;
        //write your code here......
        //以一次落下加一次回弹为一个周期 最后一次没有回弹 所以减掉h
        for(int i=0;i<n;i++){
            sum+=h;
            h=h/2;
            sum+=h;
        }
        sum-=h;
        System.out.println(String.format("%.3f", h)+" "+String.format("%.3f", sum));

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

    }
}