2987 2
2 1 -114514
1 2 1919810

out：

902648.00000000

hack的题解：

https://www.luogu.com.cn/article/cjeu2qxe
https://www.luogu.com.cn/article/79jihmik
https://www.luogu.com.cn/article/sppjwutf
https://www.luogu.com.cn/article/wyx4h9nb
https://www.luogu.com.cn/article/6wmsc93x
https://www.luogu.com.cn/article/3rrt0esz

原因：初始值设的范围太小了。

hack by @Nanxl07，本人负责转发