题？
~~虽然我不会debug~~
by Textbook_blasphemy @ 2021-05-03 19:40:37
@[linyuhan](/user/100690) `build(1,1,n)`→`build(1,n,1)`
by abuyao @ 2021-05-03 19:46:16
改完后RE了。。。
by kawaii__yuyu @ 2021-05-03 19:55:47
```cpp
build(lc(rt),l,m);
build(rc(rt),m+1,r);
```
↓
```cpp
build(l,m,lc(rt));
build(m+1,r,rc(rt));
```
by abuyao @ 2021-05-03 19:59:08
还是WA20pts
要疯了
不过谢谢大佬
by kawaii__yuyu @ 2021-05-03 20:04:52