Submission #1134214

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134214		bpptidp	Norela (info1cup18_norela)	C++20	75 / 100	1036 ms	436 KiB

norela

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

using ll=long long;
ll c[26];

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n,m;
    cin>>n>>m;

   	int cn=0;
    for(int i=0,q,x;i<m;++i){
    	cin>>q;
    	cn+=(q==n);
    	while(q--){
    		cin>>x;
    		c[i]|=(1ll<<(x-1));
    	}
    }

    if(cn==m){
    	cout<<"1\n1";
    	return 0;
    }

    ll g=0;
    for(int i=0;i<n;++i)g|=(1ll<<i);

    int ans=0,nw,cans=m;
    for(int j=0;j<m;++j)
    	ans|=(1<<(m-j-1));

    for(int msk=1;msk<(1<<m);++msk){
    	ll x=g,pc2=0;
    	nw=0;
    	for(int j=0;j<m;++j){
    		if(msk&(1<<j)){
    			x^=c[j];
    			nw|=(1<<(m-j-1));
    			++pc2;
    		}
    	}
    	if(!x){
    		int pc1=cans;
    		if(pc1<pc2)continue;
    		if(pc1>pc2){ans=nw;cans=pc2;}
    		else ans=max(ans,nw);
    	}
    }

    cout<<cans<<'\n';
    for(int i=m-1;~i;--i)
    	if(ans&(1<<i))cout<<m-i<<' ';
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 0 / 25