?
1
cc

正确输出：

NO

错误输出：

YES

错误题解：

https://www.luogu.com.cn/blog/dedicatus545/solution-p3167

https://www.luogu.com.cn/blog/letqwq/tong-pei-fu-pi-pei

https://www.luogu.com.cn/blog/chance-meeting/solution-p3167