%%%
by lacunes @ 2019-11-16 14:25:04
~~窝觉得起码是 ```1ull<<(n-1)```~~
by 凋零傲风 @ 2019-11-16 15:27:01
@[凋零傲风](/user/26923) 没事最多63不会爆ll
by d3NtMDAw @ 2019-11-16 18:10:25
@[Enquir](/user/108975) 左移 64 位会 UB，然后会发生一些奇妙的事情（比如 RE，比如 WA
by CYJian @ 2019-11-16 19:53:21
@[CYJian](/user/20782) 所以我WA了
by Enquir @ 2019-11-16 19:56:53