题解 | #小球走过路程计算#

import java.util.Scanner;
import static java.lang.Math.pow;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        // 下落的高度和落地的次数
        float h = scanner.nextFloat();
        int n = scanner.nextInt();
        float sum = 0;
        //write your code here......
        float a = h;
        for (int i = 1; i <= n; i++) {
            if (i == 1) {
                sum = h;
            } else {
                h = a / (float) pow(2, i - 1);
                sum = sum + h * 2;
            }
        }
        float h1 = h / 2;
        System.out.println(String.format("%.3f", h1) + " " +
                           String.format("%.3f", sum));
    }
}