func_code_string: #include <bits/stdc++.h>   const int INF = 1e7;   using namespace std;   const int N = 20;   int n, m;   int c[N];   int a[N];   int like[N];   string s[N];   int T_res = 0;   int Lika = 0;   bool Check_Res() {     int Lik;     for (int i = 2; i <= m; i++) {       {         Lik = 0;         for (int j = 0; j <= n - 1; j++)           if (a[j] == (s[i][j] -  0 )) Lik++;         if (Lik != like[i]) return false;       }     }     return true;   }   void attempt(int i, int same) {     if (i == n) {       if (same == like[1] && Check_Res() == true) {         T_res++;       }       return;     }     a[i] = !((s[1][i]) -  0 );     attempt(i + 1, same);     if (same < like[1]) {       a[i] = (s[1][i] -  0 );       attempt(i + 1, same + 1);     }   }   int main() {     scanf( %d%d , &n, &m);     for (int i = 1; i <= m; i++) {       cin >> s[i];       cin >> like[i];     }     attempt(0, 0);     cout << T_res;   }   