UVa 10919 - Prerequisites?

// UVa 10919 - Prerequisites?

#include <iostream>
#include <map>
using namespace std;

int main() {
	int n, m;

	while (cin >> n >> m && n) {

		map<int, bool> taken;
		for (int i = 0; i < n; i++) {
			int a;
			cin >> a;
			taken[a] = true;
		}
		bool possible = true;
		for (int i = 0; i < m; i++) {
			int tot, need;
			cin >> tot >> need;
			for (int i = 0; i < tot; i++) {
				int a;
				cin >> a;
				if (taken[a])
					need--;
			}
			if (need > 0)
				possible = false;
		}
		if (possible)
			cout << "yes" << endl;
		else
			cout << "no" << endl;
	}
	return 0;
}