补充一下图片
![](https://raw.githubusercontent.com/Genius320/luogu/master/P1023.png)
by HuskyRye @ 2017-09-01 20:01:41
辛苦啦
by xfydemx @ 2017-09-27 23:29:13
大佬qvq
by hanker_AFO @ 2017-10-11 11:17:47
很好的思路
by xiaohubao @ 2018-01-30 18:20:16
# 大佬
by zzqDeco @ 2018-02-28 23:03:20