Problem:
Score : 300 points

Problem Statement

We have N switches with "on" and "off" state, and M bulbs. The switches are numbered 1 to N, and the bulbs are numbered 1 to M.

Bulb i is connected to k_i switches: Switch s_{i1}, s_{i2}, ..., and s_{ik_i}. It is lighted when the number of switches that are "on" among these switches is congruent to p_i modulo 2.

How many combinations of "on" and "off" states of the switches light all the bulbs?

Constraints

1 \leq N, M \leq 10

1 \leq k_i \leq N

1 \leq s_{ij} \leq N

s_{ia} \neq s_{ib} (a \neq b)

p_i is 0 or 1.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N M
k_1 s_{11} s_{12} ... s_{1k_1}
:
k_M s_{M1} s_{M2} ... s_{Mk_M}
p_1 p_2 ... p_M

Output

Print the number of combinations of "on" and "off" states of the switches that light all the bulbs.

Sample Input 1

2 2
2 1 2
1 2
0 1

Sample Output 1

1

Bulb 1 is lighted when there is an even number of switches that are "on" among the following: Switch 1 and 2.

Bulb 2 is lighted when there is an odd number of switches that are "on" among the following: Switch 2.

There are four possible combinations of states of (Switch 1, Switch 2): (on, on), (on, off), (off, on) and (off, off). Among them, only (on, on) lights all the bulbs, so we should print 1.

Sample Input 2

2 3
2 1 2
1 1
1 2
0 0 1

Sample Output 2

0

Bulb 1 is lighted when there is an even number of switches that are "on" among the following: Switch 1 and 2.

Bulb 2 is lighted when there is an even number of switches that are "on" among the following: Switch 1.

Bulb 3 is lighted when there is an odd number of switches that are "on" among the following: Switch 2.

Switch 1 has to be "off" to light Bulb 2 and Switch 2 has to be "on" to light Bulb 3, but then Bulb 1 will not be lighted. Thus, there are no combinations of states of the switches that light all the bulbs, so we should print 0.

Sample Input 3

5 2
3 1 2 5
2 2 3
1 0

Sample Output 3

8

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#ifndef _MSC_VER
#include <bits/stdc++.h>
#endif // ! _MSC_VER

using namespace std;

typedef long ll;


int sw[11];
int p[11];

int n, m;

#define DB

int main(int, char**)
{
	int ans = 0;
	cin >> n >> m;

	for (int i = 0; i < m; ++i) {
		int k;
		cin >> k;
		for (int j = 0; j < k; ++j) {
			int a;
			cin >> a;
			sw[i] |= (1 << (a - 1));
		}
	}
	for (int i = 0; i < m; ++i) {
		cin >> p[i];
	}

	for (int i = 0; i < (1 << n); ++i) {
		bool isOK = true;
		for (int j = 0; j < m; ++j) {
			int cnt = 0;
			int m = 1;
			for (int k = 0; k < n; ++k) {
				if (((sw[j] & m) > 0) && ((i & m) > 0))
					cnt++;
				m <<= 1;
			}
			if (cnt % 2 != p[j]) {
				isOK = false;
				break;
			}
		}
		if (isOK)
			ans++;
	}
	cout << ans << endl;

	return 0;
}