@[seanlsy](/user/674247)
注意Add函数,应该先更新sum,再更新桶tim,不然会导致算重,Add函数改成这样就过了:
```cpp
inline void Add(int x){
sum+=tim[a[x]^k],tim[a[x]]++;
}
```
by liu_chen_hao @ 2022-08-02 16:23:08
@[liu_chen_hao](/user/438461) 已经过了,谢谢
by seanlsy @ 2022-08-03 08:02:14