以1/2为公比的等比数列求和(无穷级数)
小球的距离
http://www.nowcoder.com/questionTerminal/e637331ec6254a74a863ccb9040444c4
以1/2为公比的等比数列求和(无穷级数),经过的距离包括往上弹的,所以乘3:
import java.util.*; public class Balls { public int calcDistance(int A, int B, int C, int D) { // write code here return (A + B + C + D)*3; } }