Problem 1001 题意是哪种意思?这组样例该输出什么?

From00 | 2015-08-22 19:39:53Author
RT 样例:1 1 2 5 该输出什么?
admin | 2015-08-22 19:41:03# 1
第0秒开始时开启同时弹出球,第1秒开始时关闭,第2秒开始时开启同时弹出球,第3秒开始时关闭,第4秒开始时开启同时弹出球,以此类推
matrix_68 | 2015-08-22 20:04:15# 2
请问楼上既然关闭后重新计时为什么还会弹出球?
rt
admin | 2015-08-22 20:05:25# 3
To matrix_68: When the machine starts up, it will pop out a ball immediately. It's in the first line of Problem Description