Submission #1304595

#	Time	Username	Problem	Language	Result	Execution time	Memory
1304595		tuncay_pasha	Norela (info1cup18_norela)	C++20	0 / 100	42 ms	424 KiB

norela

#include "bits/stdc++.h"

using namespace std;

#ifdef debug
  #include "debug.hpp"
#else
  #define dbg(...)
  #define dbgx(x)
  #define line()
#endif

#define int long long
#define vi vector<int>
#define vvi vector<vi>
#define pii pair<int, int>
#define size(x) (int)(x.size())

void _() {
  int n, m;
  cin >> n >> m;
  vi opr[m + 1];
  for (int i = 1; i <= m; ++i) {
    int q;
    cin >> q;
    while (q--) {
      int x;
      cin >> x;
      opr[i].push_back(x);
    }
  }
  vi ans = {(int)(1e9)};
  for (int mask = 1; mask <= (1LL << m); ++mask) {
    vi mark(n + 1, false);
    for (int i = 0; i < m; ++i) {
      if ((mask & (1LL << i)) == false)
        continue;
      for (int &q : opr[i + 1])
        mark[q] = !mark[q];
    }
    bool ok = true;
    for (int i = 1; i <= n; ++i) {
      if (mark[i] == false) {
        ok = false;
        break;
      }
    }
    if (ok == false)
      continue;
    vi idx = {};
    for (int i = 0; i < m; ++i)
      if (mask & (1LL << i))
        idx.push_back(i + 1);
    if (size(ans) > size(idx))
      ans = idx;
    else if (size(ans) == size(idx)) ans = min(ans, idx);
  }
  assert(ans.back() != (int)(1e9));
  cout << size(ans) << '\n';
  for (int &v : ans)
    cout << v << ' ';
  cout << '\n';
}

signed main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  // freopen("in.txt", "r", stdin);
  int t = 1;
  // cin >> t;
  for (int cs = 1; cs <= t; ++cs) {
    _();
  }
  return 0;
}

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