1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
#include <iostream>
#include <vector>
using namespace std;
int res=0;
int n;
int k=0;
string a;
vector<int>V[10000001];
bool tab[10000000];
void read_and_prepare()
{
    cin>>n;
    cin.ignore();
    getline(cin,a);
    for(unsigned int i=0;i<a.size();i++)
    {
        if(a[i]=='(')
        {
            while(a[i]!=')')
            {
                if(a[i]=='x')
                {
                    int x=0;
                    i++;
                    while((int)a[i]>=48 && (int)a[i]<=57)
                    {
                        x*=10;
                        x+=(int)a[i]-48;
                        i++;
                    }
                    V[k].push_back(2*x);
                    i--;
                }else
                if(a[i]=='~')
                {
                    int x=0;
                    i+=2;
                    while((int)a[i]>=48 && (int)a[i]<=57)
                    {
                        x*=10;
                        x+=(int)a[i]-48;
                        i++;
                    }
                    V[k].push_back(2*x+1);
                    i--;
                }
                i++;
            }
            k++;
        }
    }
}
bool check()
{
    for(int i=0;i<k;i++)
    {
        bool flag=0;
        for(unsigned int j=0;j<V[i].size();j++)
        {
            if(tab[V[i][j]])
            {
                flag=1;
                break;
            }
        }
        if(!flag)return false;
    }
    return true;
}
void solve(int i,bool x)
{
    tab[2*i]=x;
    tab[2*i+1]=!x;
    if(i==n)if(check())res++;
    if(i<n)
    {
        solve(i+1,0);
        solve(i+1,1);
    }
}
int main()
{
    ios_base::sync_with_stdio(0);
    read_and_prepare();
    solve(0,0);
    cout<<res;
}