Submission #831179

#	Time	Username	Problem	Language	Result	Execution time	Memory
831179		Darren0724	Port Facility (JOI17_port_facility)	C++17	0 / 100	1 ms	468 KiB

port_facility

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define x first
#define y second
const int mod=1e9+7;


int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;cin>>n;
    vector<pair<int,int>> v(n);
    for(int i=0;i<n;i++){
        cin>>v[i].x>>v[i].y;
    }
    sort(v.begin(),v.end());
    set<int> d;
    int ans=1;
    for(int i=0;i<n;i++){
        while(d.size()&&*d.begin()<v[i].x){
            d.erase(d.begin());
        }
        int cnt=2-d.size();
        assert(d.size()<=2);
        for(int p:d){
            if(p>v[i].y){
                cnt++;
            }
        }
        ans=ans*cnt%mod;
        //cout<<v[i].x<<' '<<cnt<<endl;
        if(ans==0){
            cout<<0<<endl;
            return 0;
        }
        d.insert(v[i].y);
    }
    cout<<ans<<endl;
    
    return 0;
}

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