里循环写错了，是i++
```cpp
for(int j=1;j+(1<<j)-1<=n;j++)
{
for(int i=1;i+(1<<j)-1<=n;j++)//这里
{
st[i][j]=max(st[i][j-1],st[i+(1<<(j-1))][j-1]);
}
}
```
by tang_mx @ 2023-07-25 11:27:59
@[zhangzhiqiao0130](/user/637499)
by tang_mx @ 2023-07-25 11:29:51
@[zhangzhiqiao0130](/user/637499) 首先您的st数组定义有误，应改为`st[100010][21]`。再就是j的循环条件应该为j <= 20。21行j++改为i++。最后ans应该为
`int ans = max(st[l][x],st[r-(1<<x)+1][x]);`，输出ans时还应该换行。
by OcTar @ 2023-07-25 11:30:50
谢谢
by zhangzhiqiao0130 @ 2023-07-25 11:31:53
已关注
by zhangzhiqiao0130 @ 2023-07-25 11:32:29
@[shanshande](/user/594916) 确实，我竟然没注意到出来他错误这么多
by tang_mx @ 2023-07-25 11:33:14