Submission #1101283

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101283		irmuun	Port Facility (JOI17_port_facility)	C++17	10 / 100	110 ms	504 KiB

port_facility

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n;
    cin>>n;
    ll a[n+5],b[n+5];
    vector<ll>c(2*n+5);
    vector<bool>in(2*n+5);
    for(ll i=1;i<=n;i++){
        cin>>a[i]>>b[i];
        c[a[i]]=i;
        c[b[i]]=i;
        in[a[i]]=true;
        in[b[i]]=false;
    }
    ll ans=0;
    vector<ll>A,B;
    for(ll i=0;i<(1ll<<n);i++){
        ll cur=0;
        bool ok=true;
        A.clear();
        B.clear();
        for(ll j=1;j<=2*n;j++){
            if(in[j]){
                if(i&(1ll<<cur)) A.pb(c[j]);
                else B.pb(c[j]);
                cur++;
            }
            else{
                if(!A.empty()&&A.back()==c[j]){
                    A.pop_back();
                }
                else if(!B.empty()&&B.back()==c[j]){
                    B.pop_back();
                }
                else{
                    ok=false;
                    break;
                }
            }
        }
        if(ok) ans++;
    }
    cout<<ans;
}

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