Submission #639867

#	Time	Username	Problem	Language	Result	Execution time	Memory
639867		Vladth11	Norela (info1cup18_norela)	C++14	0 / 100	4 ms	460 KiB

norela

#include <bits/stdc++.h>
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "
 
using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <long double, pii> muchie;
 
const ll NMAX = 25;
const ll VMAX = 101;
const ll INF = 2e9;
const ll MOD = 1000000007;
const ll BLOCK = 447;
const ll base = 117;
const ll nr_of_bits = 24;
const ll inv2 = 500000004;
 
int n, m;
 
ll spell[NMAX];
ll dp[(1 << 24)];
ll all = 0;
int bit[nr_of_bits + 1];
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int i;
    cin >> n >> m;
    for(i = 0; i < n; i++)
        all |= (1LL << i);
    for(i = 1; i <= m; i++){
        int q;
        cin >> q;
        while(q--){
            int x;
            cin >> x;
            x--;
            spell[i - 1] |= (1LL << x);
        }
    }
    dp[0] = 0;
    int minim = 2e9, maxim = -1;
    for(int j = 0; j < m; j++){
        bit[(1 << j)] = j;
    }
    for(int i = 1; i < (1 << m); i++){
        int j = i & (-i);
        if(j != 0){
            dp[i] = dp[i ^ j] ^ spell[bit[j]];
        }
        if(dp[i] == all){
            if(minim > __builtin_popcount(i)){
                minim = __builtin_popcount(i);
                maxim = i;
            }else if(minim == __builtin_popcount(i)){
                for(int j = 0; j < m; j++){
                    int bitI = i & (1 << j);
                    int bitM = maxim & (1 << j);
                    if(bitI == bitM) continue;
                    if(bitI > bitM){
                        maxim = i;
                    }
                    break;
                }
            }
        }
    }
    cout << minim << "\n";
    for(i = 0; i < n; i++){
        if(maxim & (1LL << i)){
            cout << i + 1 << " ";
        }
    }
    return 0;
}

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