Submission #1289573

#	Time	Username	Problem	Language	Result	Execution time	Memory
1289573		opitu	Norela (info1cup18_norela)	C++20	75 / 100	1051 ms	580 KiB

norela

#pragma GCC target("tune=native")
#pragma GCC optimize("Ofast,inline")
#include <bits/stdc++.h>
#define int long long
#define POP __builtin_popcount
#define iamaperson int main() {\
preprocess();\
int t = 1; while (t--) solve();\
}
using namespace std;

void preprocess() {} // just in case!!!!1

void solve() {
    int n, m; cin >> n >> m;
    vector<int> mgc(m);
    for (int i = 0; i < m; ++i) {
        int q; cin >> q;
        for (int _ = 0; _ < q; ++_) {
            int x; cin >> x;
            mgc[i] |= 1LL<<(x-1);
        }
    }
    vector<int> pot;
    for (int i = 0; i < 1LL<<m; ++i) {
        int x = 0;
        for (int j = 0; j < m; ++j) if (i&(1<<(m-1-j))) {
            x ^= mgc[j];
        }
        if (x == (1LL<<n)-1) {
            if (!pot.size() || POP(pot.back()) == POP(i)) pot.push_back(i);
            else if (POP(pot.back()) > POP(i)) pot = vector{i};
        }
    }
    int ans = *max_element(pot.begin(), pot.end());
    cout << POP(ans) << '\n';
    for (int j = 0; j < m; ++j) if (ans&(1<<(m-1-j))) cout << 1+j << ' ';
}

#undef int

iamaperson

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