我不会啊为啥?
by Clot230王凯正 @ 2021-10-06 19:43:32
$2^n$数组预处理一下,不用位运算试试,我60分这个原因
by guosoun @ 2021-10-21 22:02:25
@[Clot230王凯正](/user/534794)
我也错在这里。
把
```cpp
(1 << n - 1)
```
改为
```cpp
((unsigned long long)1 << n - 1)
```
否则会溢出
by wbw。 @ 2022-02-05 15:40:47