P2146 [NOI2015]软件包管理器 树链剖分模板题

继续复习(预习)

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn=1e5+5;
int tr[maxn<<2],lazy[maxn<<2];
int dep[maxn],fa[maxn],size[maxn],id[maxn],top[maxn],son[maxn];
int times=0,n;
int head[maxn];
struct Node{
	int next,to;
}edge[maxn<<1];
int z=0;
void add_edge(int x,int y){
	edge[z].next=head[x];
	edge[z].to=y;
	head[x]=z++;
}
void dfs1(int x){
	dep[x]=dep[fa[x]]+1;
	size[x]=1;
	for(int i=head[x];i!=-1;i=edge[i].next){
		int y=edge[i].to;
		if(y==fa[x])continue;
		fa[y]=x;
		dfs1(y);
		size[x]+=size[y];
		if(size[son[x]]<size[y])son[x]=y;
	}
}
void dfs2(int x,int tp){
	top[x]=tp;id[x]=++times;
	if(son[x]==0)return ;
	dfs2(son[x],tp);
	for(int i=head[x];i!=-1;i=edge[i].next){
		int y=edge[i].to;
		if(y!=fa[x]&&y!=son[x])dfs2(y,y);
	}
}
void build(int o,int l,int r){
	tr[o]=0;
	lazy[o]=-1;
	if(l==r){
		return ;
	}
	int mid=l+r>>1;
	build(o<<1,l,mid);
	build(o<<1|1,mid+1,r);
}
void push_down(int o,int len){
	if(lazy[o]!=-1){
		lazy[o<<1]=lazy[o];
		lazy[o<<1|1]=lazy[o];
		tr[o<<1]=(len-len/2)*lazy[o];
		tr[o<<1|1]=len/2*lazy[o];
		lazy[o]=-1;
	}
}
int query(int o,int l,int r,int x,int y){
	if(x<=l&&y>=r)return tr[o];
	int mid=l+r>>1;
	int tmp=0;
	push_down(o,r-l+1);
	if(mid>=x)tmp+=query(o<<1,l,mid,x,y);
	if(mid<y)tmp+=query(o<<1|1,mid+1,r,x,y);
	return tmp;
}
void update(int o,int l,int r,int x,int y,int flag){
	if(x<=l&&y>=r){
		tr[o]=(r-l+1)*flag;
		lazy[o]=flag;
		return ;
	}
	int mid=l+r>>1;
	//push_down(o,r-l+1);
	if(mid>=x)update(o<<1,l,mid,x,y,flag);
	if(mid<y)update(o<<1|1,mid+1,r,x,y,flag);
	tr[o]=tr[o<<1]+tr[o<<1|1];
}
int qrange(int x,int y){
	int ans=0;
	while(top[x]!=top[y]){
		if(dep[top[x]]<dep[top[y]])swap(x,y);
		ans+=query(1,1,n,id[top[x]],id[x]);
		x=fa[top[x]];
	}
	if(dep[x]>dep[y])swap(x,y);
	ans+=query(1,1,n,id[x],id[y]);
	return ans;
}
void updrange(int x,int y,int flag){
	while(top[x]!=top[y]){
		if(dep[top[x]]<dep[top[y]])swap(x,y);
		update(1,1,n,id[top[x]],id[x],flag);
		x=fa[top[x]];
	}
	if(dep[x]>dep[y])swap(x,y);
	update(1,1,n,id[x],id[y],flag);
}
int dbug(int x){
	return query(1,1,n,x,x);
}
void solve(){
	char op[20];
	int x;
	scanf("%s",&op);
	scanf("%d",&x);x++;
	if(op[0]=='i'){
		printf("%d
",dep[x]-qrange(1,x));
		updrange(1,x,1);
	}
	if(op[0]=='u'){
		printf("%d
",query(1,1,n,id[x],id[x]+size[x]-1));
		update(1,1,n,id[x],id[x]+size[x]-1,0);
	}
//	cout<<dbug(1)<<" "<<dbug(2)<<" "<<dbug(3)<<" "<<dbug(4)<<" "<<dbug(5)<<" "<<dbug(6)<<" "<<dbug(6)<<endl;
}
int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++)head[i]=-1;
	for(int i=2;i<=n;i++){
		int x;
		scanf("%d",&x);x++;
		add_edge(i,x);add_edge(x,i);
	}
	dfs1(1);
	dfs2(1,1);
	//for(int i=1;i<=n;i++)cout<<id[i]<<" ";
	//cout<<endl;
	//cout<<endl;
	int q;
	scanf("%d",&q);
	while(q--)solve();
}