Submission #889175

#	Time	Username	Problem	Language	Result	Execution time	Memory
889175		Aiperiii	Port Facility (JOI17_port_facility)	C++14	10 / 100	6075 ms	976 KiB

port_facility

#include <bits/stdc++.h>
#define int long long
#define all(x) x.begin(),x.end()
#define ff first
#define ss second
#define pb push_back
using namespace std;
bool check(vector <vector <int> > v){
    stack <int> st;
    for(auto x : v){
        if(x[1]==0)st.push(x[2]);
        else{
            if(st.size()!=0 && st.top()==x[2])st.pop();
            else return false;
        }
    }
    return true;
}
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);
    int n;
    cin>>n;
    vector <pair <int,int> > v(n);
    for(int i=0;i<n;i++){
        cin>>v[i].ff>>v[i].ss;
    }
    int cnt=0;
    for(int i=0;i<(1<<n);i++){
        vector <vector <int> > gr1,gr2;
        for(int j=0;j<n;j++){
            if((i & (1<<j))!=0){
                gr1.pb({v[j].ff,0,j});
                gr1.pb({v[j].ss,1,j});
            }
            else{
                
                gr2.pb({v[j].ff,0,j});
                gr2.pb({v[j].ss,1,j});
            }
        }
        sort(all(gr1));
        sort(all(gr2));
        if(check(gr1) && check(gr2))cnt++;
    }
    cout<<cnt<<"\n";
}
/*
0 2 1
0 4 2
0 6 3
1 5 1
1 7 3
1 8 2

0 2 1
1 5 1
*/

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