Submission #241050

#	Time	Username	Problem	Language	Result	Execution time	Memory
241050		kshitij_sodani	Port Facility (JOI17_port_facility)	C++17	22 / 100	6076 ms	58744 KiB

port_facility

#include <bits/stdc++.h>
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second
//#define endl '\n'
llo n;
llo mod=1e9+7;
pair<llo,llo> it[1000001];
llo vis[1000001];
vector<llo> adj[1000001];
llo st=0;
void dfs(llo no,llo col=1){
	vis[no]=col;
	for(auto j:adj[no]){
		if(vis[j]==0){
			dfs(j,3-col);
		}
		else if(vis[j]==vis[no]){
			st=1;
		}
	}
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n;
	for(llo i=0;i<n;i++){
		cin>>it[i].a>>it[i].b;
	}
	for(llo i=0;i<n;i++){
		for(llo j=0;j<n;j++){
			if(j==i){
				continue;
			}
			if(it[i].a<=it[j].a and it[i].b<=it[j].b and it[i].b>=it[j].a){
				adj[i].pb(j);
				adj[j].pb(i);
		//		cout<<i<<","<<j<<endl;
			}
		}
	}
	llo co=0;
	for(llo i=0;i<n;i++){
		if(vis[i]==0){
			dfs(i);
			co+=1;
		}
	}
	if(st){
		cout<<0<<endl;
	}
	else{
		llo ans=1;
		for(llo i=0;i<co;i++){
			ans*=2;
			ans%=mod;
		}
		cout<<ans<<endl;

	}








	return 0;
}

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