正确答案：428
错误答案：400
by Sword_K @ 2021-05-16 15:55:11
@[mrsrz](/user/6813)
https://www.luogu.com.cn/blog/62951/solution-p4377
https://www.luogu.com.cn/blog/wenge/solution-p4377
这两篇题解均被hack
by 月落落落 @ 2021-09-22 09:57:17
已经加入数据并撤下相关题解
by mrsrz @ 2021-09-22 10:41:04