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답안 #947686

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
947686 2024-03-16T20:15:36 Z PM1 Sumtree (INOI20_sumtree) C++17
10 / 100
 256 ms 280616 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){
		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);
		}
		
		
		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);
		}
		
		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;
      |            ^
Main.cpp:151:31: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
  151 |    seg[1].up(1,1,n+1,st[z],g[z]-w-w);
      |                            ~~~^

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 145 ms 134740 KB Output is correct
2 Correct 128 ms 132756 KB Output is correct
3 Correct 121 ms 131640 KB Output is correct
4 Correct 142 ms 134224 KB Output is correct
5 Correct 133 ms 131176 KB Output is correct
6 Correct 60 ms 117584 KB Output is correct
7 Correct 59 ms 117328 KB Output is correct
8 Correct 43 ms 115040 KB Output is correct
9 Correct 145 ms 128844 KB Output is correct
10 Correct 154 ms 129464 KB Output is correct
11 Correct 142 ms 129360 KB Output is correct
12 Correct 113 ms 125272 KB Output is correct
13 Correct 131 ms 133580 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 25 ms 113500 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 241 ms 275796 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 256 ms 280616 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 145 ms 134740 KB Output is correct
2 Correct 128 ms 132756 KB Output is correct
3 Correct 121 ms 131640 KB Output is correct
4 Correct 142 ms 134224 KB Output is correct
5 Correct 133 ms 131176 KB Output is correct
6 Correct 60 ms 117584 KB Output is correct
7 Correct 59 ms 117328 KB Output is correct
8 Correct 43 ms 115040 KB Output is correct
9 Correct 145 ms 128844 KB Output is correct
10 Correct 154 ms 129464 KB Output is correct
11 Correct 142 ms 129360 KB Output is correct
12 Correct 113 ms 125272 KB Output is correct
13 Correct 131 ms 133580 KB Output is correct
14 Incorrect 25 ms 113500 KB Output isn't correct
15 Halted 0 ms 0 KB -