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 Rust (1.42.0) (judge verdict: Accepted)

// -*- coding:utf-8-unix -*-

use proconio::input;
use std::collections::HashSet;

fn main() {
    input! {
        n: usize,
        m: usize,
    }
    let mut k = vec![];
    let mut s = vec![];
    for _ in 0..m {
        input! {
            a: usize,
            b: [u16; a],
        }
        k.push(a);
        s.push(b);
    }
    input! {
        p: [u16; m],
    }
    // println!("k: {:?}", k);
    // println!("s: {:?}", s);
    // println!("p: {:?}", p);

    let mut ans = 0;
    for bit_row in 0..2u32.pow(n as u32) {
        // println!("{:b}", bit_row);
        let mut selected = HashSet::new();
        for i in 0..n {
            if (bit_row & (1 << i)) > 0 {
                selected.insert(i as u16);
            }
        }
        // println!("on: {:?}", selected);

        // if selected.len() == 0 {
        //     if p.iter().all(|&a| a == 0) {
        //         ans += 1;
        //     }
        // }

        for i in 0..m {
            let mut swsum = 0;
            for j in 0..k[i] {
                // スイッチは 1 スタート
                if selected.contains(&(s[i][j] - 1)) {
                    swsum += 1;
                }
            }
            // println!("sw no. {}: {}", i, swsum);
            if swsum % 2 != p[i] {
                break;
            }

            if i == m - 1 {
                ans += 1;
            }
        }
    }
    println!("{}", ans);
}