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 h1=h;
        float sum = 0;
        for (int i = 0; i < n ; i++) {
            sum += 2f * h;
            h /= 2f;
        }
        sum -= h1;//第一次落地时多加了一个h的路程，所以现在需要减去。
        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));


    }
}