Submission #1074971

#	Time	Username	Problem	Language	Result	Execution time	Memory
1074971		raduv	Norela (info1cup18_norela)	C++17	0 / 100	13 ms	456 KiB

norela

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast", "O3", "unroll-loops")
#pragma GCC target("popcnt", "avx2")
#define int long long
const int MAXM = 24;
const int MAXN = 60;
using namespace std;
long long v[MAXM];
int smaller(int mask1, int mask2){
  int i;
  for( i = 0; i < MAXN; i++ ){
    if(((mask1 & (1 << i)) > 0) != ((mask2 & (1 << i)) > 0)){
      if(mask1 & (1 << i))
        return 1;
      return 0;
    }
  }
  return 0;
}
signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m, q, bit, i;
    long long rez, mask, cmask;
    cin >> n >> m;
    for( i = 0; i < m; i++ ){
      cin >> q;
      while(q--){
        cin >> bit;
        bit--;
        v[i] |= (1 << bit);
      }
    }
    cmask = 0;
    for( mask = 0; mask < (1 << m); mask++ ){
      rez = 0;
      for( i = 0; i < m; i++ ){
        if(mask & (1 << i)){
          rez ^= v[i];
        }
      }
      if(__builtin_popcount(rez) == n && (__builtin_popcount(mask) < __builtin_popcount(cmask) || cmask == 0)){
        cmask = mask;
      }
      else if(__builtin_popcount(rez) == n && __builtin_popcount(mask) < __builtin_popcount(cmask) && smaller(mask, cmask))
        cmask = mask;
    }
    cout << __builtin_popcount(cmask) << "\n";
    for( i = 0; i < m; i++ ){
      if(cmask & (1 << i))
        cout << i + 1 << " ";
    }
    return 0;
}

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