oj.uz

답안 #947677

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
947677 2024-03-16T19:58:50 Z PM1 Sumtree (INOI20_sumtree) C++17
10 / 100
 230 ms 134876 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define fr first
#define sc second
const int mxn=5e5+5,M=1e9+7,kkk=(1<<21);
int n,q,r,st[mxn],fn[mxn],cnt=0,sz[mxn],g[mxn],bbb;
ll ans,fuck[mxn],rfuck[mxn];
vector<int>v[mxn];
ll ferma(ll x){
	ll num=M-2,res=1;
	while(num){
		if(num&1)res=(res*x)%M;
		x=(x*x)%M;
		num/=2;
	}
	return res;
}
void dfs(int z){
	sz[z]=1;
	st[z]=++cnt;
	for(auto i:v[z]){
		if(!st[i]){
			dfs(i);
			sz[z]+=sz[i];
		}
	}
	fn[z]=cnt;
}
void make(){
	fuck[0]=rfuck[0]=1;
	for(int i=1;i<=n+r;i++){
		fuck[i]=(fuck[i-1]*i)%M;
		rfuck[i]=ferma(fuck[i]);
	}
}
ll comb(int x,int y,bool w){
	if(x>y){
		bbb+=(w)?-1:1;
		return 1;
	}
	ll res=fuck[y]*rfuck[x];
	res%=M;
	res*=rfuck[y-x];
	return res%M;
}
struct segment{
	ll val[kkk];
	void up(int id,int L,int R,int l,int x){
		return ;
		if(L+1==R){
			val[id]=x;
			return;
		}
		int mid=(L+R)/2;
		if(l<mid)
			up(id*2,L,mid,l,x);
		else
			up(id*2+1,mid,R,l,x);
		val[id]=val[id*2]+val[id*2+1];
	}
	ll get(int id ,int L,int R,int l,int r){
		return 1;
		if(L==l && R==r)
			return val[id];
		int mid=(L+R)/2;
		ll res=0;
		if(l<mid)
			res+=get(id*2,L,mid,l,min(r,mid));
		if(r>mid)
			res+=get(id*2+1,mid,R,max(l,mid),r);
		return res;
	}
}seg[2];
struct fnd{
	set<int>s[kkk];
	int get(int id,int L,int R,int l,int r){
		return 1;
		if(L==l && R==r)
			return ((s[id].size())?*s[id].rbegin():0);
		int mid=(L+R)/2,res=((s[id].size())?*s[id].rbegin():0),x=0;
		if(l<mid){
			x=get(id*2,L,mid,l,min(r,mid));
		}
		return (x)?x:res;
	}
	void add(int id ,int L,int R,int l,int r,int x,bool y){
		return ;
		if(L==l && R==r){
			if(y)
				s[id].insert(x);
			else
				s[id].erase(x);
			return;
		}
		int mid=(L+R)/2;
		if(l<mid)
			add(id*2,L,mid,l,min(r,mid),x,y);
		if(r>mid)
			add(id*2+1,mid,R,max(l,mid),r,x,y);
	}
}fnd;
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>r;
	for(int i=1;i<n;i++){
		int x,y;
		cin>>x>>y;
		v[x].push_back(y);
		v[y].push_back(x);
	}
	dfs(1);
	make();
	ans=comb(n-1,n+r-1,0);
	seg[0].up(1,1,n+1,1,n);
	seg[1].up(1,1,n+1,1,r);
	fnd.add(1,1,n+1,1,n+1,1,1);
	g[1]=r;
	cout<<ans<<'\n';
	cin>>q;
	while(q--){
		int ty,x,y,z;
		cin>>ty;
		if(ty==1){
			cin>>x>>g[x];
			z=fnd.get(1,1,n+1,st[x],fn[x]+1);
			fnd.add(1,1,n+1,st[x],fn[x]+1,st[x],1);
		}
		else{
			cin>>x;
			fnd.add(1,1,n+1,st[x],st[y]+1,st[x],0);
			 z=fnd.get(1,1,n+1,st[x],st[y]+1);
		}
		
		assert(z!=0);
		int t1=seg[0].get(1,1,n+1,st[x],fn[x]+1)-seg[0].get(1,1,n+1,st[x],st[x]+1);
		int t2=seg[0].get(1,1,n+1,st[z],fn[z]+1)-seg[0].get(1,1,n+1,st[z],st[z]+1);
		ll v1=seg[1].get(1,1,n+1,st[x],fn[x]+1);
		ll v2=seg[1].get(1,1,n+1,st[z],fn[z]+1);
		if(ty==1){
			int sz1=sz[x]-t1;
			int sz2=sz[z]-t2-sz1;
			seg[0].up(1,1,n+1,st[x],sz1);
			seg[0].up(1,1,n+1,st[z],sz2);

			ans*=ferma(comb(sz[z]-t2-1,sz[z]-t2+v2-1,1));
			ans%=M;
			//cout<<comb(sz[z]-t2-1,sz[z]-t2+v2-1,1)<<" ";
			int val1=comb(sz1-1,sz1-1+g[x]-v1,0);
			int val2=comb(sz2-1,sz2-1+v2-g[x]+v1,0);
			ans*=val1;
			ans%=M;
			ans*=val2;
			ans%=M;
			seg[1].up(1,1,n+1,st[x],g[x]-v1-v1);
			seg[1].up(1,1,n+1,st[z],0);
			ll w=seg[1].get(1,1,n+1,st[z],fn[z]+1);
			seg[1].up(1,1,n+1,st[z],g[z]-w-w);
		}
		else{
			int sz1=sz[x]-t1;
			int sz2=sz[z]-t2+sz1;
			seg[0].up(1,1,n+1,st[x],0);
			seg[0].up(1,1,n+1,st[z],sz2);
			//cout<<v1<<" "<<v2<<'\n';
			ans*=ferma(comb(sz1-1,sz1+v1-1,1));
			ans%=M;
			ans*=ferma(comb(sz[z]-t2-1,sz[z]-t2+v2-1,1));
			ans%=M;

			int val1=comb(sz2-1,sz2-1+v2+v1,0);
			ans*=val1;
			ans%=M;

			seg[1].up(1,1,n+1,st[x],0);
			seg[1].up(1,1,n+1,st[z],0);
			ll w=seg[1].get(1,1,n+1,st[z],fn[z]+1);
			seg[1].up(1,1,n+1,st[z],g[z]-w-w);

		}
		if(bbb){
			cout<<0<<'\n';
		}
		else
			cout<<ans<<'\n';
	}
	return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 230 ms 134552 KB Output is correct
2 Correct 129 ms 132584 KB Output is correct
3 Correct 119 ms 131664 KB Output is correct
4 Correct 173 ms 134368 KB Output is correct
5 Correct 139 ms 130900 KB Output is correct
6 Correct 61 ms 117328 KB Output is correct
7 Correct 60 ms 117328 KB Output is correct
8 Correct 42 ms 115200 KB Output is correct
9 Correct 140 ms 128960 KB Output is correct
10 Correct 144 ms 129004 KB Output is correct
11 Correct 152 ms 129108 KB Output is correct
12 Correct 110 ms 125012 KB Output is correct
13 Correct 140 ms 133540 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 24 ms 113244 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 168 ms 134876 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 215 ms 130132 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 230 ms 134552 KB Output is correct
2 Correct 129 ms 132584 KB Output is correct
3 Correct 119 ms 131664 KB Output is correct
4 Correct 173 ms 134368 KB Output is correct
5 Correct 139 ms 130900 KB Output is correct
6 Correct 61 ms 117328 KB Output is correct
7 Correct 60 ms 117328 KB Output is correct
8 Correct 42 ms 115200 KB Output is correct
9 Correct 140 ms 128960 KB Output is correct
10 Correct 144 ms 129004 KB Output is correct
11 Correct 152 ms 129108 KB Output is correct
12 Correct 110 ms 125012 KB Output is correct
13 Correct 140 ms 133540 KB Output is correct
14 Incorrect 24 ms 113244 KB Output isn't correct
15 Halted 0 ms 0 KB -