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답안 #947886

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
947886 2024-03-17T08:07:14 Z PM1 Sumtree (INOI20_sumtree) C++17
10 / 100
 3000 ms 282708 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,ll x){
		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){
		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){
		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){
		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],fn[x]+1,st[x],0);
			 z=fnd.get(1,1,n+1,st[x],fn[x]+1);
		}

		int t1=seg[0].get(1,1,n+1,st[x]+1,fn[x]+1);
		int t2=seg[0].get(1,1,n+1,st[z]+1,fn[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){
			seg[0].up(1,1,n+1,st[x],sz[x]-t1);
			seg[0].up(1,1,n+1,st[z],-sz[x]+t1);

			ans*=ferma(comb(sz[z]-t2-1,sz[z]-t2+v2-1,1));
			ans%=M;
			
			int sz1=sz[x]-t1;
			int sz2=sz[z]-t2-sz1;

			seg[1].up(1,1,n+1,st[x],g[x]-v1);
			seg[1].up(1,1,n+1,st[z],v1-g[x]);

			v1=seg[1].get(1,1,n+1,st[x],fn[x]+1);
			v2=seg[1].get(1,1,n+1,st[z],fn[z]+1);

			int val1=comb(sz1-1,sz1-1+v1,0);
			int val2=comb(sz2-1,sz2-1+v2,0);
			ans*=val1;
			ans%=M;
			ans*=val2;
			ans%=M;
			
		}
		else{
			
			int sz1=sz[x]-t1;
			int sz2=sz[z]-t2;

			ans*=ferma(comb(sz1-1,sz1+v1-1,1));
			ans%=M;
			ans*=ferma(comb(sz2-1,sz2+v2-1,1));
			ans%=M;

			seg[0].up(1,1,n+1,st[x],-sz1);
			seg[0].up(1,1,n+1,st[z],sz1);
			
			sz2+=sz1;

			seg[1].up(1,1,n+1,st[x],-v1);
			seg[1].up(1,1,n+1,st[z],v1);
			
			v2=seg[1].get(1,1,n+1,st[z],fn[z]+1);
			int val1=comb(sz2-1,sz2-1+v2,0);
			ans*=val1;
			ans%=M;

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

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:120:12: warning: unused variable 'y' [-Wunused-variable]
  120 |   int ty,x,y,z;
      |            ^

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 177 ms 134696 KB Output is correct
2 Correct 185 ms 132692 KB Output is correct
3 Correct 140 ms 131608 KB Output is correct
4 Correct 166 ms 134256 KB Output is correct
5 Correct 203 ms 131240 KB Output is correct
6 Correct 82 ms 117588 KB Output is correct
7 Correct 85 ms 117516 KB Output is correct
8 Correct 68 ms 115280 KB Output is correct
9 Correct 184 ms 128888 KB Output is correct
10 Correct 199 ms 129104 KB Output is correct
11 Correct 169 ms 129160 KB Output is correct
12 Correct 148 ms 125268 KB Output is correct
13 Correct 157 ms 133488 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 3059 ms 112468 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 292 ms 282708 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 526 ms 136740 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 177 ms 134696 KB Output is correct
2 Correct 185 ms 132692 KB Output is correct
3 Correct 140 ms 131608 KB Output is correct
4 Correct 166 ms 134256 KB Output is correct
5 Correct 203 ms 131240 KB Output is correct
6 Correct 82 ms 117588 KB Output is correct
7 Correct 85 ms 117516 KB Output is correct
8 Correct 68 ms 115280 KB Output is correct
9 Correct 184 ms 128888 KB Output is correct
10 Correct 199 ms 129104 KB Output is correct
11 Correct 169 ms 129160 KB Output is correct
12 Correct 148 ms 125268 KB Output is correct
13 Correct 157 ms 133488 KB Output is correct
14 Execution timed out 3059 ms 112468 KB Time limit exceeded
15 Halted 0 ms 0 KB -