【[SCOI2015]情报传递】

非常无脑的板子题，就当是练一下板子

我们可以先将所有的操作离线下来，之后那些搜集过情报的点就有了点权，对于查询操作，就是查询一下这条路径上有几个点点权满足(st<=now-C+1)

#include<iostream>
#include<cstdio>
#include<cstring>
#define re register
#define maxn 200005
int n,cnt,tot,m,num;
int l[maxn*29],r[maxn*29],d[maxn*29];
int rt[maxn],a[maxn];
int cur;
int X[maxn],Y[maxn],C[maxn],Day[maxn];
int build(int x,int y)
{
	int root=++cnt;
	if(x==y) return root;
	int mid=x+y>>1;
	l[root]=build(x,mid),r[root]=build(mid+1,y);
	return root;
}
int change(int pre,int x,int y,int pos)
{
	int root=++cnt;
	d[root]=d[pre]+1;
	if(x==y) return root;
	l[root]=l[pre],r[root]=r[pre];
	int mid=x+y>>1;
	if(pos<=mid) l[root]=change(l[pre],x,mid,pos);
		else r[root]=change(r[pre],mid+1,y,pos);
	return root;
}
struct E
{
	int v,nxt;
}e[maxn<<1];
int head[maxn],sum[maxn],son[maxn],top[maxn],fa[maxn],deep[maxn];
inline void add_edge(int x,int y)
{
	e[++num].v=y;
	e[num].nxt=head[x];
	head[x]=num;
}
void dfs1(int x)
{
	rt[x]=change(rt[fa[x]],1,n+1,a[x]);
	sum[x]=1;
	int maxx=-1;
	for(re int i=head[x];i;i=e[i].nxt)
	if(!deep[e[i].v])
	{
		deep[e[i].v]=deep[x]+1;
		fa[e[i].v]=x;
		dfs1(e[i].v);
		sum[x]+=sum[e[i].v];
		if(sum[e[i].v]>maxx) maxx=sum[e[i].v],son[x]=e[i].v;
	}
}
void dfs2(int x,int topf)
{
	top[x]=topf;
	if(!son[x]) return;
	dfs2(son[x],topf);
	for(re int i=head[x];i;i=e[i].nxt)
	if(deep[e[i].v]>deep[x]&&e[i].v!=son[x]) dfs2(e[i].v,e[i].v);
}
inline int LCA(int x,int y)
{
	while(top[x]!=top[y])
	{
		if(deep[top[x]]<deep[top[y]]) std::swap(x,y);
		x=fa[top[x]];
	}
	if(deep[x]<deep[y]) return x;
	return y;
}
inline int read()
{
	char c=getchar();
	int x=0;
	while(c<'0'||c>'9') c=getchar();
	while(c>='0'&&c<='9')
		x=(x<<3)+(x<<1)+c-48,c=getchar();
	return x;
}
int query(int p1,int p2,int p3,int p4,int x,int y,int ll,int rr)
{
	if(ll<=x&&rr>=y) return d[p1]+d[p2]-d[p3]-d[p4];
	int mid=x+y>>1;
	if(rr<=mid) return query(l[p1],l[p2],l[p3],l[p4],x,mid,ll,rr);
	if(ll>mid) return query(r[p1],r[p2],r[p3],r[p4],mid+1,y,ll,rr);
	return query(l[p1],l[p2],l[p3],l[p4],x,mid,ll,rr)+query(r[p1],r[p2],r[p3],r[p4],mid+1,y,ll,rr);
}
int main()
{
	n=read();
	int RT=0,x;
	for(re int i=1;i<=n;i++)
	{
		x=read();
		if(!x) RT=i;
			else add_edge(x,i);
	}
	rt[0]=build(1,n+1);
	m=read();
	int opt;
	for(re int i=1;i<=m;i++)
	{
		opt=read();
		if(opt==1) X[++cur]=read(),Y[cur]=read(),C[cur]=read(),Day[cur]=i;
			else a[read()]=i; 
	}
	for(re int i=0;i<=n+1;i++)
	if(!a[i]) a[i]=n+1;
	rt[0]=change(rt[0],1,n+1,n+1);
	deep[RT]=1,dfs1(RT),dfs2(RT,RT);
	for(re int i=1;i<=cur;i++)
	{
		int lca=LCA(X[i],Y[i]);
		printf("%d ",deep[X[i]]+deep[Y[i]]-2*deep[lca]+1);
		if(Day[i]-C[i]-1<1) puts("0");
			else printf("%d
",query(rt[X[i]],rt[Y[i]],rt[lca],rt[fa[lca]],1,n+1,1,Day[i]-C[i]-1));
	}
	return 0;
}