Submission #204985

#	Time	Username	Problem	Language	Result	Execution time	Memory
204985		Haunted_Cpp	Norela (info1cup18_norela)	C++17	75 / 100	1094 ms	508 KiB

norela

#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <stack>
#include <algorithm>
#include <cstring>
#include <cassert>
#include <bitset>
using namespace std;
 
#define FOR(i, a, b) for (int i = a; i < (int) b; i++)
#define F0R(i, a) FOR(i, 0, a)
#define ROF(i, a, b) for (int i = a; i >= (int) b; i--)
#define R0F(i, a) ROF(i, a, 0)
#define GO(i, a) for (auto i : a)
 
#define f first
#define s second
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
 
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
typedef vector<vi> vvi;
typedef vector<vpii> vvpii;
typedef long long i64;
typedef vector<i64> vi64;
 
const int dr[] = {+1, -1, +0, +0, +1, -1, +1, -1};
const int dc[] = {+0, +0, +1, -1, +1, -1, -1, +1};
const int ms[] = {+31, +29, +31, 30, +31, +30, +31, +31, +30, +31, +30, +31};

void setIO(string nome) {
  ios_base::sync_with_stdio(0); cin.tie(0);
  freopen ((nome + ".in").c_str(), "r", stdin);
  freopen ((nome + ".out").c_str(), "w", stdout);
}

int main () {
  ios_base::sync_with_stdio(0); 
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<i64> q (m);
  F0R (i, m) {
    int foo;
    cin >> foo;
    i64 mask = 0;
    F0R (j, foo) {
      int bar;
      cin >> bar;
      --bar;
      mask |= (1LL << bar);
    }
    q[i] = mask;
  }
  i64 ans = (1LL << 60) - 1;
  i64 Get = 0;
  F0R (mask, 1 << m) {
    Get = 0;
    F0R (i, m) {
      if ((mask >> i) & 1) {
        Get ^= q[i];
      }
    }
    if (__builtin_popcountll(Get) == n) {
      if (__builtin_popcountll(mask) == __builtin_popcountll(ans)) {
        F0R (i, m) {
          int A = ((ans >> i) & 1);
          int B = ((mask >> i) & 1);
          if (A && !B) {
            break;
          }
          if (B && !A) {
            ans = mask;
            break;
          }
        }
        continue;
      }
      if (__builtin_popcountll(mask) < __builtin_popcountll(ans)) ans = mask;
    }
  }
  cout << __builtin_popcountll(ans) << '\n';
  F0R (i, m) {
    if ((ans >> i) & 1) cout << i + 1 << ' ';
  }
  cout << '\n';
  return 0;
}

Compilation message (stderr)

norela.cpp: In function 'void setIO(std::__cxx11::string)':
norela.cpp:39:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ((nome + ".in").c_str(), "r", stdin);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
norela.cpp:40:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ((nome + ".out").c_str(), "w", stdout);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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