Submission #988864

#	Time	Username	Problem	Language	Result	Execution time	Memory
988864		vjudge2	Port Facility (JOI17_port_facility)	C++17	0 / 100	0 ms	348 KiB

port_facility

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

#define int long long

const int mod = 1000000007;

int bm(int b, int pw) {
    if (!pw) return 1;
    int res = bm(b, pw / 2);
    res = res * res % mod;
    if (pw % 2 == 1) res = res * b % mod;
    return res;
}

int p[1000001];

int find(int u) {
    return p[u] == u ? u : p[u] = find(p[u]);
}

int32_t main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int n, cnt = 0;
    cin >> n;
    vector<pair<int, int>> a(n);
    vector<int> compo(n, 0);
    for (int i = 0; i < n; i++) p[i] = i;
    for (auto& [x, y] : a) cin >> x >> y;
    sort(a.begin(), a.end());
    for (int i = 0; i < n; i++) {
        for (int j = i + 1; j < n; j++) {
            if (a[j].first < a[i].second && a[i].second < a[j].second) {
                if (find(i) != find(j)) p[find(j)] = find(i);
                else return cout << "0\n", 0;
            }
        }
    }
    for (int i = 0; i < n; i++) compo[find(i)] = 1;
    for (int i = 0; i < n; i++) cnt += compo[i];
    cout << bm(2, cnt) << '\n';
}

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