[HAOI2015]树上操作 T19 D71

[HAOI2015]树上操作 T19 D71

[HAOI2015]树上操作

树剖模板题

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define fi first
#define se second
#define pb push_back
#define si size()
#define ls (p<<1)
#define rs ((p<<1)|1)
#define mid (t[p].l+t[p].r)/2 
using namespace std;
ll read(){ll x=0,f=1;char ch=getchar();while(ch<'0'||ch>'9'){if(ch=='-') f=-1;ch=getchar();}while(ch>='0'&&ch<='9'){x=(x<<1)+(x<<3)+(ch^48);ch=getchar();}return x*f;}
inline void Prin(ll x){if(x < 0){putchar('-');x = -x;}if(x > 9) Prin(x / 10);putchar(x % 10 + '0');}
const int qs=1e5+7;
ll mod=1e16;
int n,m;
ll a[qs];
pii id[qs];
int son[qs],sz[qs],fr[qs],f[qs],cnt,dep[qs],top[qs];
vector<int> v[qs]; 
struct Tree{
	ll val,add;
	int l,r;
	#define l(x) t[x].l
	#define r(x) t[x].r
	#define val(x) t[x].val
	#define add(x) t[x].add
}t[qs<<2];

void pushup(int p){ val(p)=(val(ls)+val(rs))%mod;}
void down(int p){
	if(!add(p)) return;
	val(ls)=(val(ls)+add(p)*(r(ls)-l(ls)+1))%mod;
	val(rs)=(val(rs)+add(p)*(r(rs)-l(rs)+1))%mod;
	add(ls)=(add(ls)+add(p))%mod;
	add(rs)=(add(rs)+add(p))%mod;
	add(p)=0;
}
void build(int p,int l,int r){
	l(p)=l,r(p)=r;add(p)=0;
	if(l==r){
		val(p)=a[fr[l]]%mod;
		return;
	}
	build(ls,l,mid);
	build(rs,mid+1,r);
	pushup(p);
//	cout<<"l="<<l<<" r="<<r<<" val="<<val(p)<<"\n";
}

void update(int p,int l,int r,ll val){
	if(l<=l(p)&&r>=r(p)){
		val(p)=(val(p)+val*(r(p)-l(p)+1))%mod;
		add(p)=(add(p)+val)%mod;
		//cout<<"l="<<l(p)<<" r="<<r(p)<<" val="<<val(p)<<"\n";
		return;
	}
	down(p);
	if(l<=mid) update(ls,l,r,val);
	if(r>mid) update(rs,l,r,val);
	pushup(p);
}

ll ask(int p,int l,int r){
	if(l<=l(p)&&r>=r(p)) return val(p);
	down(p);
	ll val=0;
	if(l<=mid) val=(val+ask(ls,l,r))%mod;
	if(r>mid) val=(val+ask(rs,l,r))%mod;
	return val; 
}

void dfs(int x,int fa){
	f[x]=fa; son[x]=0; sz[x]=1; dep[x]=dep[fa]+1;
	int ms=0;
	for(int i=0;i<v[x].si;++i){
		int p=v[x][i];
		if(p==fa) continue;
		dfs(p,x);
		if(sz[p]>ms) ms=sz[p],son[x]=p;
	}
}

void dfn(int x,int po){
	id[x].fi=++cnt; fr[cnt]=x;
	top[x]=po;
	if(!son[x]){
		id[x].se=cnt;
		return;
	}
	dfn(son[x],po);
	for(int i=0;i<v[x].si;++i){
		int p=v[x][i];
		if(p==f[x]||p==son[x]) continue;
		dfn(p,p);
	}
	id[x].se=cnt;
}

ll qRange(int x,int y){
	ll ans=0,res=0;
	while(top[x]!=top[y]){
		if(dep[top[x]]<dep[top[y]]) swap(x,y);
		res=ask(1,id[top[x]].fi,id[x].fi);
		ans=ans+res;
		x=f[top[x]];
	}
	if(dep[x]>dep[y]) swap(x,y);
	res=ask(1,id[x].fi,id[y].fi);
	ans=ans+res;
	return ans;
}

int main(){
	n=read(),m=read();
	for(int i=1;i<=n;++i) a[i]=read();
	int x,y,op,z;
	for(int i=1;i<n;++i){
		x=read(),y=read();
		v[x].pb(y),v[y].pb(x);
	}
	dfs(1,0);
	dfn(1,1);
	build(1,1,n);
	while(m--){
		op=read(),x=read();
		if(op==1){
			z=read();
			update(1,id[x].fi,id[x].fi,z);
		}
		else if(op==2){
			z=read();	
			update(1,id[x].fi,id[x].se,z);
		}
		else{
			cout<<qRange(1,x)<<"\n";
		}
	}
	
} 

标签：qs,D71,val,int,ll,son,HAOI2015,T19,define
来源： https://www.cnblogs.com/Suki-Sugar/p/15435007.html