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;

   if(n==1){//只弹一次的情况
       sum=h;
   }
else{
    for (int i = 2; i <= n; i++) {//弹两次及以上
            sum += (float)(2* (h * Math.pow(0.5, i - 1)));第i次到第i-1次之间落地走过的距离

        }
        h=(float)(h * Math.pow(0.5,n));第n次的弹起高度
}
        
        //输出格式为：System.out.println(String.format("%.3f", h)+" "+String.format("%.3f", sum));
        System.out.println(String.format("%.3f", h)+" "+String.format("%.3f", sum));
    
    

}

}