为什么难度降低了0.0

P1220 关路灯

```cpp ![](https://cdn.luogu.com.cn/upload/pic/1.png) ![](https://cdn.luogu.com.cn/upload/pic/2.png) ![](https://cdn.luogu.com.cn/upload/pic/3.png) ![](https://cdn.luogu.com.cn/upload/pic/4.png) ![](https://cdn.luogu.com.cn/upload/pic/5.png) ![](https://cdn.luogu.com.cn/upload/pic/6.png) ![](https://cdn.luogu.com.cn/upload/pic/7.png) ![](https://cdn.luogu.com.cn/upload/pic/8.png) ![](https://cdn.luogu.com.cn/upload/pic/9.png) ```
by Snitro @ 2017-06-11 08:56:33

![](https://cdn.luogu.com.cn/upload/pic/1023.png)
by 览遍千秋 @ 2017-08-06 08:20:43

![](https://cdn.luogu.com.cn/upload/pic/6371.png)
by Victorique @ 2017-09-24 08:22:03

讨论号末尾加一个4
by 扫雷王子 @ 2020-08-03 19:00:38

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