@[ChenHacker](/user/92288) %%%
by George1123 @ 2020-01-22 17:50:27
蓝钩巨佬要蒟蒻帮他查主席树
by George1123 @ 2020-01-22 17:50:50
by George1123 @ 2020-01-22 17:51:05
@[♗Wendigo♝](/user/118365) 您不也是蓝勾吗，帮我查一下呗
by ChenHacker @ 2020-01-22 17:53:13
@[ChenHacker](/user/92288) 你的错误很明显
by George1123 @ 2020-01-22 17:58:09
主席树根本不是这么写的
by George1123 @ 2020-01-22 17:59:24
```cpp
int modify(int p,int l,int r,int x) {
int rt=++cnt;
lc[rt]=lc[p]; rc[rt]=rc[p]; sum[rt]=sum[p]+1;
if(l<r) {
if(x<=mid) lc[rt]=modify(lc[rt],l,mid,x);
else rc[rt]=modify(rc[rt],mid+1,r,x);
}
return rt;
}
```
by George1123 @ 2020-01-22 17:59:49
```cpp
int query(int u,int v,int l,int r,int L,int R) {
if(L>R) return 0;
if(u==0) return 0;
if(l>=L&&r<=R) return sum[v]-sum[u];
int res=0;
if(L<=mid) res+=query(lc[u],lc[v],l,mid,L,R);
if(R>mid) res+=query(rc[u],rc[v],mid+1,r,L,R);
return res;
}
```
by George1123 @ 2020-01-22 18:00:14
你的代码到处都是多余的语句
by George1123 @ 2020-01-22 18:00:30
https://www.luogu.com.cn/paste/e6f7k8k2
by George1123 @ 2020-01-22 18:00:58