Submission #97909

#	Time	Username	Problem	Language	Result	Execution time	Memory
97909		314rate	Norela (info1cup18_norela)	C++14	100 / 100	91 ms	512 KiB

norela

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

int n,m;
ll mask[30];

int st[30],vf=0;

int best=100;
int sir[30];

void go(int p,ll cur)
{
        if(p>m)
        {
                if(cur==0 && vf<best)
                {
                        best=vf;
                        for(int i=1;i<=vf;i++)
                        {
                                sir[i]=st[i];
                        }
                }
        }
        else
        {
                st[++vf]=p;
                go(p+1,(cur^mask[p]));
                vf--;
                go(p+1,cur);
        }
}

int main()
{
        ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
        cin>>n>>m;
        for(int i=1;i<=m;i++)
        {
                int l;
                cin>>l;
                for(int j=1;j<=l;j++)
                {
                        int bit;
                        cin>>bit;
                        bit--;
                        mask[i]+=(1LL<<bit);
                }
        }
        go(1,(1LL<<n)-1);
        cout<<best<<"\n";
        for(int i=1;i<=best;i++)
        {
                cout<<sir[i]<<" ";
        }
        cout<<"\n";
        return 0;
}
/**

**/

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 25 / 25