Submission #413282

#	Time	Username	Problem	Language	Result	Execution time	Memory
413282		Aryan_Raina	Port Facility (JOI17_port_facility)	C++17	10 / 100	777 ms	504 KiB

port_facility

#include <bits/stdc++.h>
using namespace std;

#define int int64_t
#define ld long double
#define ar array
 
const int INF = 1e12;
const int MOD = 1e9+7;

void solve() {
    int N; cin >> N;
    vector<ar<int,3>> A;
    for (int i = 0; i < N; i++) {
        int s, e; cin >> s >> e;
        A.push_back({s, i, 1});
        A.push_back({e, i, 0});
    }
    sort(A.begin(), A.end());

    int ans = 0;
    for (int i = 0; i < (1 << N); i++) {
        stack<int> remdi[2];
        bool omk = true;
        for (auto [t, j, x] : A) {
            if (x) remdi[(i >> j) & 1].push(j);
            else {
                if (!remdi[0].empty() && remdi[0].top() == j) remdi[0].pop();
                else if (!remdi[1].empty() && remdi[1].top() == j) remdi[1].pop();
                else omk = false;
            }
        }
        ans += omk;
    }
    cout << ans << '\n';
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
 
    int t = 1; //cin >> t;
    while (t--) solve();   
}  

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