oj.uz

답안 #632535

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
632535 2022-08-20T10:08:16 Z codr0 Sumtree (INOI20_sumtree) C++14
10 / 100
 628 ms 354780 KB 
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>

#define F first
#define S second
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define FORR(i,a,b) for(int i=a;i>=b;i--)
#define err(x) cerr<<#x<<"="<<x<<'\n'
#define lc 2*id
#define rc 2*id+1
#define dmid int mid=(r+l)/2
#define all(x) x.begin(),x.end()
#define SZ(x) (int)x.size()
#define pb push_back
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define bit(i,j) ((j>>i)&1)

using namespace std;
const int md=1e9+7;
const int N=5e5+4;
const int NN=2e5+4;
int n;
vector<int> adj[NN];
int fct[N],inv[N];
int ans,t;
int sz[NN],h[NN],st[NN],en[NN],tme;
int A[NN],B[NN];
struct fenwick{
	int fen[NN];
	void add(int k,int x){
		while(k<NN){
			fen[k]+=x;
			k+=(k&(-k));
		}
	}
	int Get(int k){
		int rt=0;
		while(k>0){
			rt+=fen[k];
			k-=(k&(-k));
		}
		return rt;
	}
	int get(int l,int r){
		return (Get(r)-Get(l-1));
	}
}; fenwick f1,f2;
struct PQ{
	priority_queue<pii> pq1;
	priority_queue<pii> pq2;
	void add(pii x){
		pq1.push(x);
	}
	void erase(pii x){
		pq2.push(x);
	}
	int get(){
		while(!pq2.empty()&&pq1.top()==pq2.top()) pq1.pop(),pq2.pop();
		if(pq1.empty()) return 0;
		return (pq1.top().S);
	}
};
PQ seg[4*NN];

	void upd(int id,int l,int r,int v,int x){
		if(st[v]>=r||en[v]<=l) return;
		if(x==+1) seg[id].add({h[v],v});
		else seg[id].erase({h[v],v});
		if(l+1==r) return;
		dmid;
		upd(lc,l,mid,v,x);
		upd(rc,mid,r,v,x);
	}

	int get(int id,int l,int r,int v){
		if(st[v]<l||st[v]>=r) return 0;
		int rt=seg[id].get();
		if(l+1==r) return rt;
		dmid;
		int x1=get(lc,l,mid,v);
		int x2=get(rc,mid,r,v);
		if(h[x1]>h[rt]) rt=x1;
		if(h[x2]>h[rt]) rt=x2;
		return rt;
	}

	int pw(int a,int b){
		int rt=1;
		while(b){
			if(b&1) rt=1LL*rt*a%md;
			a=1LL*a*a%md;
			b/=2;
		}
		return rt;
	}

	int C(int r,int _n){
		if(r<0||r>_n) return 1;
		return (1LL*(1LL*fct[_n]*inv[r]%md)*inv[_n-r]%md);
	}

	void dfs(int v,int p){
		h[v]=h[p]+1;
		st[v]=++tme;
		sz[v]=1;
		for(int u:adj[v]) if(u!=p){ dfs(u,v); sz[v]+=sz[u];}
		en[v]=tme;
	}

	void add(int v,int w){
		int par=get(1,1,n+1,v);
		upd(1,1,n+1,v,+1);
		f1.add(st[par],-A[par]);
		f2.add(st[par],-B[par]);
		ans=1LL*ans*pw(C(B[par],A[par]+B[par]-1),md-2)%md;
		if(B[par]<0) t--;
		A[v]=sz[v]-f1.get(st[v],en[v]);
		B[v]=w-f2.get(st[v],en[v]);
		A[par]-=A[v];
		B[par]-=B[v];
		f1.add(st[par],A[par]);
		f1.add(st[v],A[v]);
		f2.add(st[par],B[par]);
		f2.add(st[v],B[v]);
		if(B[v]<0) t++;
		if(B[par]<0) t++;
		ans=1LL*ans*C(B[par],A[par]+B[par]-1)%md;
		ans=1LL*ans*C(B[v],A[v]+B[v]-1)%md;
	}

	void OUT(){
		if(t>0){ cout<<"0\n"; return; }
		cout<<ans<<'\n';
	}

	int32_t main(){
	iostream::sync_with_stdio(0); cin.tie(0);
	
	fct[0]=1; FOR(i,1,N-1) fct[i]=1LL*fct[i-1]*i%md;
	inv[N-1]=pw(fct[N-1],md-2); FORR(i,N-2,0) inv[i]=1LL*inv[i+1]*(i+1)%md;
	int k; cin>>n>>k;
	FOR(i,1,n-1){
		int u,v; cin>>u>>v;
		adj[u].pb(v);
		adj[v].pb(u);
	}
	dfs(1,1);
	ans=C(k,k+n-1);
	t=0;
	A[1]=n;
	B[1]=k;
	f1.add(st[1],A[1]);
	f2.add(st[1],B[1]);
	upd(1,1,n+1,1,+1);
	OUT();
	int q; cin>>q;
	while(q--){
		int id,v,w;
		cin>>id>>v;
		if(id==1){
			cin>>w;
			add(v,w);
		}//else rm(v);
		OUT();
	}

	return 0;
	}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 162 ms 91340 KB Output is correct
2 Correct 163 ms 91272 KB Output is correct
3 Correct 159 ms 91336 KB Output is correct
4 Correct 161 ms 91276 KB Output is correct
5 Correct 165 ms 87464 KB Output is correct
6 Correct 36 ms 59636 KB Output is correct
7 Correct 37 ms 59468 KB Output is correct
8 Correct 37 ms 59508 KB Output is correct
9 Correct 166 ms 83660 KB Output is correct
10 Correct 167 ms 83556 KB Output is correct
11 Correct 169 ms 83696 KB Output is correct
12 Correct 153 ms 82396 KB Output is correct
13 Correct 152 ms 88824 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 33 ms 59012 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 628 ms 354780 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 413 ms 227112 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 162 ms 91340 KB Output is correct
2 Correct 163 ms 91272 KB Output is correct
3 Correct 159 ms 91336 KB Output is correct
4 Correct 161 ms 91276 KB Output is correct
5 Correct 165 ms 87464 KB Output is correct
6 Correct 36 ms 59636 KB Output is correct
7 Correct 37 ms 59468 KB Output is correct
8 Correct 37 ms 59508 KB Output is correct
9 Correct 166 ms 83660 KB Output is correct
10 Correct 167 ms 83556 KB Output is correct
11 Correct 169 ms 83696 KB Output is correct
12 Correct 153 ms 82396 KB Output is correct
13 Correct 152 ms 88824 KB Output is correct
14 Incorrect 33 ms 59012 KB Output isn't correct
15 Halted 0 ms 0 KB -