@[ping_fan](/user/39586) `printf` 输出 `long double` 的格式不是 `%lf`，把那个强制类型转换改成 `double` 就能过。
```cpp
printf("%.2lf", (double)fyl.anc / n);
```
by recollector @ 2022-11-19 00:10:33
@[recollector](/user/177893)
感谢大佬orz
by ping_fan @ 2022-11-19 09:09:00