5321
P5321 [BJOI2019] 送别 题解--zhengjun
由于大家的做法需要大量分类讨论和代码量,这里提供一种不怎么分类的,容易实现的做法。 首先,由于墙体会随时变化,所以直接对墙体本身维护不是很方便。 我们可以牺牲一点常数,对 \((i,j)\) 建立四个点 \(UL_{i,j},UR_{i,j},DL_{i,j},DR_{i,j}\) 分别表示 \(( ......
Yahoo: 451 Message temporarily deferred due to unresolvable RFC.5321 from domain
Hello, Thank you for contacting Yahoo Postmaster. The error you’re getting is caused by an issue with your From address. These errors indicate that th ......