将:
```cpp
f[fx]=y;
```
改为:
```cpp
f[fx]=fy;
```
by qishifeng0001 @ 2023-11-22 17:25:58
![](https://cdn.luogu.com.cn/upload/image_hosting/px5fpm5o.png)
by bcbgszyzh @ 2023-11-22 17:27:19