oj.uz

답안 #947696

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
947696 2024-03-16T20:25:15 Z PM1 Sumtree (INOI20_sumtree) C++17
10 / 100
 314 ms 137580 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);
		}
		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],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(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:133:7: warning: unused variable 't1' [-Wunused-variable]
  133 |   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);
      |       ^~
Main.cpp:134:7: warning: unused variable 't2' [-Wunused-variable]
  134 |   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);
      |       ^~
Main.cpp:135:6: warning: unused variable 'v1' [-Wunused-variable]
  135 |   ll v1=seg[1].get(1,1,n+1,st[x],fn[x]+1);
      |      ^~
Main.cpp:136:6: warning: unused variable 'v2' [-Wunused-variable]
  136 |   ll v2=seg[1].get(1,1,n+1,st[z],fn[z]+1);
      |      ^~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 148 ms 134652 KB Output is correct
2 Correct 129 ms 132868 KB Output is correct
3 Correct 122 ms 131736 KB Output is correct
4 Correct 152 ms 134224 KB Output is correct
5 Correct 135 ms 131152 KB Output is correct
6 Correct 58 ms 117692 KB Output is correct
7 Correct 63 ms 117328 KB Output is correct
8 Correct 41 ms 115288 KB Output is correct
9 Correct 141 ms 129116 KB Output is correct
10 Correct 156 ms 130704 KB Output is correct
11 Correct 142 ms 129344 KB Output is correct
12 Correct 114 ms 125344 KB Output is correct
13 Correct 143 ms 133528 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 22 ms 113380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 160 ms 137580 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 314 ms 131984 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 148 ms 134652 KB Output is correct
2 Correct 129 ms 132868 KB Output is correct
3 Correct 122 ms 131736 KB Output is correct
4 Correct 152 ms 134224 KB Output is correct
5 Correct 135 ms 131152 KB Output is correct
6 Correct 58 ms 117692 KB Output is correct
7 Correct 63 ms 117328 KB Output is correct
8 Correct 41 ms 115288 KB Output is correct
9 Correct 141 ms 129116 KB Output is correct
10 Correct 156 ms 130704 KB Output is correct
11 Correct 142 ms 129344 KB Output is correct
12 Correct 114 ms 125344 KB Output is correct
13 Correct 143 ms 133528 KB Output is correct
14 Incorrect 22 ms 113380 KB Output isn't correct
15 Halted 0 ms 0 KB -