你是懂小刀和大哥的 @[寒烟冷浅暮殇](/user/28397) by KFZX_xiaohao @ 2024-02-03 13:05:17
如果考虑带删除的话，就有3倍了 [SP16254](https://www.luogu.com.cn/problem/SP16254) by 寒烟冷浅暮殇 @ 2024-02-03 13:25:23