@[朕在世界之巅](/user/356740) 小郝人：前排
by Dry_ice @ 2020-07-29 19:34:54
```cpp
inline void add(int x, int d) {
while(x<=n) {
tree[x] += d;
x -= lowbit(x);
}
}
```
你再看看?
by 小恐 @ 2020-07-29 19:35:20
@[小恐](/user/173840) 哦woc 谢谢
by 朕在世界之巅 @ 2020-07-29 19:35:54
@[小恐](/user/173840) 依然[TLE](https://www.luogu.com.cn/record/36012034)
by 朕在世界之巅 @ 2020-07-29 19:40:54
@[朕在世界之巅](/user/356740) 你lowbit是什么鬼
by 小恐 @ 2020-07-29 19:42:48
@[朕在世界之巅](/user/356740) lowbit(x)=x&(-x)
by 小恐 @ 2020-07-29 19:43:28
@[小恐](/user/173840) 咋啦 这不是宏定义？防止表达式出现优先级问题
by 朕在世界之巅 @ 2020-07-29 19:44:29
@[小恐](/user/173840) 依然[TLE](https://www.luogu.com.cn/record/36012415)
by 朕在世界之巅 @ 2020-07-29 19:45:33
@[朕在世界之巅](/user/356740)
```cpp
#define lowbit(x) ((x) & (-x))
```
正确写法
by 小恐 @ 2020-07-29 19:45:34
说不定写成函数就好了
by 5ab_juruo @ 2020-07-29 19:46:30