Submission #990834

#	Time	Username	Problem	Language	Result	Execution time	Memory
990834		prvocislo	Port Facility (JOI17_port_facility)	C++17	22 / 100	6028 ms	3828 KiB

port_facility

#include <algorithm>
#include <iostream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <string>
#include <vector>
typedef long long ll;
typedef long double ld;
using namespace std;

const int mod = 1e9 + 7;
int mul(int a, int b) { return (a * 1ll * b) % mod; }
struct bod
{
    int x, y, i;
};
bool over(bod a, bod b)
{
    if (a.x < b.x && b.x < a.y && a.y < b.y) return true;
    if (b.x < a.x && a.x < b.y && b.y < a.y) return true;
    return false;
}
int n, c = 0, ans = 1;
vector<bod> a;
vector<int> col;
void dfs(int u, int c)
{
    col[u] = c;
    for (int v = 0; v < n; v++) if (over(a[u], a[v]))
    {
        if (col[v] == -1) dfs(v, c ^ 1);
        else if (col[u] == col[v]) ans = 0;
    }
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n;
    a.resize(n), col.resize(n, -1);
    for (int i = 0; i < n; i++) cin >> a[i].x >> a[i].y, a[i].i = i;
    for (int i = 0; i < n; i++) if (col[i] == -1) dfs(i, c), c += 2, ans = mul(ans, 2);
    cout << ans << "\n";
    return 0;
}

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