Submission #427840

#	Time	Username	Problem	Language	Result	Execution time	Memory
427840		errorgorn	Port Facility (JOI17_port_facility)	C++17	78 / 100	6077 ms	663844 KiB

port_facility

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define ii pair<int,int>
#define fi first
#define se second
#define endl '\n'
 
#define puf push_front
#define pof pop_front
#define pub push_back
#define pob pop_back
#define lb lower_bound
#define ub upper_bound
 
#define rep(x,s,e) for (auto x=s-(s>e);x!=e-(s>e);s<e?x++:x--)
#define all(x) (x).begin(),(x).end()
#define sz(x) (int) (x).size()
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void read(int &x){
	x=0;
	
	char ch=getchar_unlocked();
	while (ch&16){
		x=x*10+(ch&15);
		ch=getchar_unlocked();
	}
}

const int MOD=1000000007;
 
int n;
ii arr[1000005];
 
vector<int> stk;
bool vis[1000005];
bool col[1000005];
 
struct node{
	vector<ii> v[4000010];
	const int BUF=2000005;
	
	node (){
	}
	
	void update(int i,ii k){
		i+=BUF;
		
		while (i){
			v[i].pub(k);
			i>>=1;
		}
	}
	
	ii query(int i,int j){
		i+=BUF,j+=BUF+1;
		
		ii res=ii(-1e9,-1e9);
		
		for (;i<j;i>>=1,j>>=1){
			if (i&1){
				while (!v[i].empty() && vis[v[i].back().se]) v[i].pob();
				if (!v[i].empty()) res=max(res,v[i].back());
				i++;
			}
			if (j&1){
				j--;
				while (!v[j].empty() && vis[v[j].back().se]) v[j].pob();
				if (!v[j].empty()) res=max(res,v[j].back());
			}
		}
		
		return res;
	}
} *root=new node(), *root2=new node();

vector<int> d1,d2;

struct node2{
	int arr[4000010];
	const int BUF=2000005;
	
	node2(){
		memset(arr,-1,sizeof(arr));
	}
	
	void update(int i,int k){
		i+=BUF;
		
		while (i){
			arr[i]=max(arr[i],k);
			i>>=1;
		}
	}
	
	int query(int i,int j){
		i+=BUF,j+=BUF+1;
		int res=-1;
		
		for (;i<j;i>>=1,j>>=1){
			if (i&1){
				res=max(res,arr[i]);
				i++;
			}
			if (j&1){
				j--;
				res=max(res,arr[j]);
			}
		}
		
		return res;
	}
} *white=new node2(),*black=new node2();
 
int ans=1;
 
int main(){
	cin.tie(0);
	cout.tie(0);
	cin.sync_with_stdio(false);
	
	read(n);
	
	rep(x,0,n){
		read(arr[x].fi),read(arr[x].se);
		d1.pub(arr[x].fi);
		d2.pub(arr[x].se);
	}
	
	sort(all(d1));
	sort(all(d2));
	
	
	vector<int> proc;
	rep(x,0,n) proc.pub(x);
	
	sort(all(proc),[](int i,int j){
		return arr[i].se<arr[j].se;
	});
	for (auto &it:proc){
		int i=lb(all(d1),arr[it].fi)-d1.begin();
		root->update(i,ii(arr[it].se,it));
	}
 
	sort(all(proc),[](int i,int j){
		return arr[i].fi>arr[j].fi;
	});
	for (auto &it:proc){
		int i=lb(all(d2),arr[it].se)-d2.begin();
		root2->update(i,ii(-arr[it].fi,it));
	}
	
	rep(x,0,n) if (!vis[x]){
		vis[x]=true;
		stk.pub(x);
		
		ans=2*ans%MOD;
		
		while (!stk.empty()){
			int pos=stk.back();
			stk.pob();
			
			//cout<<pos<<" "<<col[pos]<<endl;
			
			if (!col[pos]){
				white->update(arr[pos].fi,arr[pos].se);
			}
			else{
				black->update(arr[pos].fi,arr[pos].se);
			}
			
			int l,r;
			
			l=lb(all(d1),arr[pos].fi)-d1.begin();
			r=ub(all(d1),arr[pos].se)-d1.begin()-1;
			while (true){
				int it=root->query(l,r).se;
				if (it==-1e9 || arr[it].se<arr[pos].se) break;
				
				vis[it]=true;
				stk.pub(it);
				
				col[it]=!col[pos];
			}
			
			l=lb(all(d2),arr[pos].fi)-d2.begin();
			r=ub(all(d2),arr[pos].se)-d2.begin()-1;
			while (true){
				int it=root2->query(l,r).se;
				if (it==-1e9 || arr[it].fi>arr[pos].fi) break;
				
				vis[it]=true;
				stk.pub(it);
				
				col[it]=!col[pos];
			}
		}
	}
	
	rep(x,0,n){
		if (!col[x]){ //white
			if (white->query(arr[x].fi,arr[x].se)>arr[x].se) ans=0;
		}
		else{ //black
			if (black->query(arr[x].fi,arr[x].se)>arr[x].se) ans=0;
		}
	}
	
	cout<<ans<<endl;
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 56 / 56
• Subtask 4: 0 / 22