Submission #1062306

#	Time	Username	Problem	Language	Result	Execution time	Memory
1062306		12345678	Port Facility (JOI17_port_facility)	C++17	10 / 100	171 ms	600 KiB

port_facility

#include <bits/stdc++.h>

using namespace std;

const int nx=21;

int n, l[nx], r[nx], res;
pair<int, int> v[2*nx];

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=0; i<n; i++) cin>>l[i]>>r[i], v[l[i]]={i, 1}, v[r[i]]={i, 0};
    for (int msk=0; msk<(1<<n); msk++)
    {
        stack<int> a, b;
        int f=0;
        for (int i=1; i<=2*n; i++)
        {
            if (v[i].second)
            {
                if (msk&(1<<v[i].first)) a.push(v[i].first);
                else b.push(v[i].first);
            }
            else
            {
                if (msk&(1<<v[i].first))
                {
                    if (a.top()!=v[i].first)
                    {
                        f=1;
                        break;
                    }
                    else a.pop();
                }
                else
                {
                    if (b.top()!=v[i].first)
                    {
                        f=1;
                        break;
                    }
                    else b.pop();
                }
            }
        }
        if (!f) res++;
    }
    if (res!=0&&__builtin_popcount(res)!=1) cout<<1/0;
    cout<<res;
}

Compilation message (stderr)

port_facility.cpp: In function 'int main()':
port_facility.cpp:50:52: warning: division by zero [-Wdiv-by-zero]
   50 |     if (res!=0&&__builtin_popcount(res)!=1) cout<<1/0;
      |                                                   ~^~

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