写一个函数并调用，解决一个小球从h米高度自由落下,每次落下后反弹回原高度的 一半再落下,求它在第n次落地时共经过多少米-Write a function and call to solve a small ball from a height h meters in free fall, bounce back after each drop to half the original height and then fall, seeking its first n second floor w