原图:
![](https://www.lydsy.com/JudgeOnline/upload/201504/aaaa.PNG)
by Monad @ 2019-03-28 16:52:58
@[chen_zhe](/space/show?uid=8457)
by caeious @ 2019-08-16 17:56:26
![](https://ooo.0o0.ooo/2017/04/29/59041aa077bc4.png)
by xiaolilsq @ 2020-04-23 12:07:09