Submission #689935

#	Time	Username	Problem	Language	Result	Execution time	Memory
689935		divad	Norela (info1cup18_norela)	C++14	100 / 100	772 ms	316 KiB

norela

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("popcnt")
#include <bits/stdc++.h>
#define int long long
#define NMAX 62
#define MMAX 26
using namespace std;
int n,m,q,x,ans,b[MMAX];
vector<int> sol;

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> m;
    ans = 0;
    for(int i = 1; i <= m; i++){
        cin >> q;
        for(int j = 1; j <= q; j++){
            cin >> x;
            b[i] |= (1LL<<(x-1));
        }
    }
    for(int i = 0; i < (1<<m); i++){
        int all = 0;
        for(int j = 0; j < m; j++){
            if(i&(1LL<<j)){
                all ^= b[j+1];
            }
        }
        if(__builtin_popcountll(all) == n){
            if(ans == 0){
                ans = i;
                for(int j = 0; j < m; j++){
                    if(i&(1LL<<j)){
                        sol.push_back(j+1);
                    }
                }
            }else{
                if(__builtin_popcount(ans) > __builtin_popcount(i)){
                    sol.clear();
                    for(int j = 0; j < m; j++){
                        if(i&(1LL<<j)){
                            sol.push_back(j+1);
                        }
                    }
                    ans = i;
                }else if(__builtin_popcount(ans) == __builtin_popcount(i)){
                    vector<int> aux;
                    int ok = -1;
                    for(int j = 0; j < m; j++){
                        if(i&(1LL<<j)){
                            aux.push_back(j+1);
                            int pos = aux.size()-1;
                            if(ok == -1){
                                if(aux[pos] > sol[pos]){
                                    ok = 0;
                                }else if(aux[pos] < sol[pos]){
                                    ok = 1;
                                }
                            }
                        }
                    }
                    if(ok){
                        sol.clear();
                        for(auto it: aux){
                            sol.push_back(it);
                        }
                        ans = i;
                    }
                }
            }
        }
    }
    cout << __builtin_popcount(ans) << "\n";
    for(auto it: sol){
        cout << it << " ";
    }
    return 0;
}

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