写树剖的建议自行差错，因为别人很难看出来
代码又长，~~自己查错可以练习debug能力~~
by 诱宵美⑨ @ 2020-02-09 10:07:40
```
ll query(int l, int r, int k, int x, int y)
{
if(l >= x && r <= y) return tree[k];
pushdown(l, r, k);
ll res = 0;
if(mid >= x) res += query(l, mid, ls, x, y);
/*
if(mid < x) res += query(mid + 1, r, rs, x, y);
*/
if(mid<y)...;
return res;
}
```
by ztz_cpp @ 2020-02-09 10:08:42
错的不是树剖……
by ztz_cpp @ 2020-02-09 10:09:14
@[ztz_cpp](/user/18181) 啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊zzt男神！！！！谢谢您！！！
by Bn_ff @ 2020-02-09 11:10:34
@[诱宵美九](/user/23121) 好的，谢谢您！
by Bn_ff @ 2020-02-09 11:11:07