可以参考下我写的[代码](https://www.luogu.com.cn/paste/gvzvm68m) by hly1204 @ 2019-12-24 17:42:25
@[hly1204](/user/242973) 谢谢奆佬,我再看看emmm by BrainiX @ 2019-12-25 19:25:22