试着把rand改成[mt19937](https://oi-wiki.org/misc/random/#mt19937)，据说会快
by cosmicAC @ 2020-06-27 12:04:50
@[破昼夜行](/user/224229) `fhq` 就是单纯常数大，和 `rand` 是没啥关系的（
by 囧仙 @ 2020-06-27 13:13:37