额... 样例没错的 还有遍数不等同于系数 by 耀晨_SYW @ 2016-09-24 16:57:58
是6啊 by kkksc03 @ 2016-09-24 17:52:40
对 by 友邻牧鸡 @ 2016-09-24 19:57:55