Submission #486033

#	Time	Username	Problem	Language	Result	Execution time	Memory
486033		sam571128	Norela (info1cup18_norela)	C++17	75 / 100	1084 ms	344 KiB

norela

#include <bits/stdc++.h>

#define int long long
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

signed main(){
    fastio
    int n,m;
    cin >> n >> m;
    
    vector<int> v(m);
    for(int i = 0;i < m;i++){
        int q;
        cin >> q;
        int tmp = 0;
        for(int j = 0;j < q;j++){
            int x;
            cin >> x;
            x--;
            tmp ^= (1LL<<x);
        }
        v[i] = tmp;
    }
    reverse(v.begin(),v.end());

    int ans = (1LL<<61)-1;
    for(int i = 0;i < (1<<m);i++){
        int now = (1LL<<n)-1;
        for(int j = 0;j < m;j++){
            if(i&(1LL<<j)){
                now ^= v[j];
            }
        }

        if(now==0){
            if(__builtin_popcountll(ans) >= __builtin_popcountll(i)) ans = i;
        }
    }

    cout << __builtin_popcountll(ans) << "\n";    
    for(int j = m-1;~j;j--){
        if(ans&(1LL<<j)){
            cout << m-j << " ";
        }
    }
}

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