Submission #1319007

#	Time	Username	Problem	Language	Result	Execution time	Memory
1319007		hssaan_arif	Norela (info1cup18_norela)	C++20	75 / 100	939 ms	444 KiB

norela

// #include <bits/stdc++.h>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <map>
#include <unordered_map>
#include <vector>
#include <iomanip>
#include <string>
#include <queue>
#include <set>
#include <deque>
using namespace std;

#define endl "\n"
#define pb push_back
#define int long long
#define fi first
#define se second

const int N = 3e5 + 5, M = 1e9 + 7, LG = 20;

int n , A[N] , x , sz , m;

void solve(){
    cin >> n >> m;

    for (int i=0 ; i<m ; i++){
        cin >> sz;
        int u = 0;
        for (int j=0 ; j<sz ; j++){
            cin >> x;
            u |= (1ll<<(x-1));
        }
        A[m-i-1] = u;
    }

    int h = 1e18 , ans = 1e18;

    for (int j=0 ; j<(1ll<<m) ; j++){

        int k = 0 , cn = 0;
        for (int i=0 ; i<m ; i++){
            if ((1ll<<i) & j){
                k ^= A[i];
                cn++;
            }
        }

        if (k == (1ll<<n) - 1){    

            // cout << j << endl;
            if (h > cn){
                h = cn;
                ans = j;
                continue;
            }

            if (j > ans && h == cn){
                ans = j;
            }
        }
    }

    cout << h << endl;
    vector<int> ans1;
    for (int i=0 ; i<m ; i++){
        if ((1ll<<i) & ans){
            ans1.pb(m-i);
        }
    }
    for (int i = ans1.size()-1; i>=0 ; i--){
        cout << ans1[i] << ' ';
    }
    
    cout << endl;
}

signed main(){
    // freopen("" , "r" , stdin);
    // freopen("" , "w" , stdout);
    // cout << setprecision(30);
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int ts = 1;
    // cin >> ts;
    while(ts--){
        solve();
    }
}

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