func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, i, j, k, lst, a[22], b[1 << 18], o[1 << 18];   long long f[1 << 18][18], g[1 << 18];   char s[22][22];   void rec(int sum, int x, int mask) {     if (sum == 0) {       for (i = 0; i < (1 << n); i++)         if (b[i] > lst)           for (j = 0; j < n; j++) f[i][j] = 0;       for (i = 0; i < (1 << n) - 1; i++)         if (b[i] >= lst)           for (j = 0; j < n; j++)             if (f[i][j]) {               int prv = (1 << n) - 1 - i;               if ((mask >> (n - b[i] - 1)) & 1) {                 for (int x = (prv & (prv - 1)); prv > 0; x &= (x - 1)) {                   k = o[prv ^ x];                   if (s[j][k] ==  1 ) f[i ^ (1 << k)][k] += f[i][j];                   prv = x;                 }               } else                 for (int x = (prv & (prv - 1)); prv > 0; x &= (x - 1)) {                   k = o[prv ^ x];                   f[i ^ (1 << k)][k] += f[i][j];                   prv = x;                 }             }       for (j = 0; j < n; j++) g[mask] += f[i][j];       return;     }     for (; x > 0; x--) {       rec(sum - x, min(sum - x, x), (mask << x) + (1 << (x - 1)) - 1);       lst = n - (sum - x + 1);     }   }   int main() {     scanf( %d , &n);     for (i = 0; i < n; i++) {       scanf( %s , s[i]);       f[1 << i][i] = 1;       o[1 << i] = i;     }     lst = 1;     for (i = 0; i < (1 << n); i++) b[i] = b[i / 2] + (i & 1);     rec(n, n, 0);     for (i = 0; i < (1 << (n - 1)); i++) {       for (m = 0, j = -1; j < n - 1; j = k) {         for (k = j + 1; k < n - 1 && ((i >> k) & 1); k++)           ;         a[m++] = k - j;       }       sort(a, a + m);       reverse(a, a + m);       for (k = j = 0; j < m; j++) k = (k << a[j]) + (1 << (a[j] - 1)) - 1;       g[i] = g[k];     }     for (j = n - 1; j >= 0; j--)       for (i = (1 << (n - 1)) - 1; i > 0; i--)         if ((i >> j) & 1) g[i ^ (1 << j)] -= g[i];     for (i = 0; i < (1 << (n - 1)); i++) printf( %I64d  , g[i]);     return 0;   }   