题解 | #小球走过路程计算#

import java.util.Scanner;
//保留小数位数String.format()
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;
        h /= 2;
        for(int i = 0; i < n - 1; i++){
            sum += 2 * h;
            h /= 2;
        }
        System.out.println(String.format("%.3f", h)+" "+String.format("%.3f", sum));
//注意这个保留小数位数的函数，以后可能会用得到；String.format("%.3f" , _ ).
        //输出格式为：System.out.println(String.format("%.3f", h)+" "+String.format("%.3f", sum));
        

    }
}