Submission #1062308

#	Time	Username	Problem	Language	Result	Execution time	Memory
1062308		12345678	Port Facility (JOI17_port_facility)	C++17	22 / 100	24 ms	16732 KiB

port_facility

#include <bits/stdc++.h>

using namespace std;

const int nx=2e3+5, mod=1e9+7;

int n, l[nx], r[nx], res=1, cnt, c[nx], f, vs[nx];
vector<int> d[nx];

void dfs(int u)
{
    vs[u]=1;
    for (auto v:d[u])
    {
        if (vs[v])
        {
            if (c[v]==c[u]) f=1;
            continue;
        }
        c[v]=!c[u];
        dfs(v);
    }
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=1; i<=n; i++) cin>>l[i]>>r[i];
    for (int i=1; i<=n; i++)
    {
        for (int j=i+1; j<=n; j++)
        {
            if ((l[i]<l[j]&&r[j]<r[i])||(l[j]<l[i]&&r[i]<r[j])||r[i]<l[j]||r[j]<l[i]) continue;
            d[i].push_back(j);
            d[j].push_back(i);
        }
    }
    for (int i=1; i<=n; i++) if (!vs[i]) dfs(i), res=(res*2)%mod;
    if (f) cout<<0;
    else cout<<res;
}

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