Submission #915808

#	Time	Username	Problem	Language	Result	Execution time	Memory
915808		andrei_iorgulescu	Norela (info1cup18_norela)	C++14	100 / 100	133 ms	432 KiB

norela

#include <bits/stdc++.h>

using namespace std;

#define int long long

int n,m,a[30];
int maskmare;
vector<int>sol,cur;
int curnum;

void bkt(int pos)
{
    if (pos == m + 1)
    {
        if (curnum == maskmare and (cur.size() < sol.size() or sol.size() == 0))
            sol = cur;
    }
    else
    {
        curnum ^= a[pos];
        cur.push_back(pos);
        bkt(pos + 1);
        curnum ^= a[pos];
        cur.pop_back();
        bkt(pos + 1);
    }
}

signed main()
{
    cin >> n >> m;
    maskmare = (1ll << n) - 1;
    for (int i = 1; i <= m; i++)
    {
        int cate;
        cin >> cate;
        for (int j = 1; j <= cate; j++)
        {
            int x;
            cin >> x;
            a[i] += (1ll << (x - 1));
        }
    }
    bkt(1);
    cout << sol.size() << '\n';
    for (auto it : sol)
        cout << it << ' ';
    return 0;
}

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