func_code_string: #include <bits/stdc++.h>   using namespace std;   char s[20][20];   long long n;   long long tmp1[15][16400][65];   long long tmp2[15][16400][65];   long long visit[20];   long long a[20];   long long k;   long long fst;   long long all;   void dfs(long long pos, long long msk, long long ans) {     if (pos == k) {       tmp1[fst][msk][ans]++;     }     if (pos == n - k) {       tmp2[visit[pos - 1]][msk][ans]++;       return;     }     for (long long i = 0; i < n; i++) {       if (msk & (1 << i)) continue;       visit[pos] = i;       dfs(pos + 1, msk | (1 << i), (ans << 1) | s[i][visit[pos - 1]]);     }   }   long long cnt[20000];   signed main() {     cin >> n;     all = (1 << n) - 1;     k = n / 2;     long long allk = (1 << (k - 1));     long long allkk = (1 << (n - k - 1));     for (long long i = 0; i < n; i++) {       cin >> s[i];     }     for (long long i = 0; i < n; i++)       for (long long j = 0; j < n; j++) s[i][j] -=  0 ;     for (fst = 0; fst < n; fst++) {       visit[0] = fst;       dfs(1, 1 << fst, 0);     }     for (long long msk = 0; msk < all; msk++) {       long long c = 0;       for (long long i = 0; i < n; i++)         if (msk & (1 << i)) c++;       if (c != k) continue;       for (long long i = 0; i < n; i++)         if (msk & (1 << i))           for (long long j = 0; j < n; j++) {             if (msk & (1 << j)) continue;             for (long long mk = 0; mk < allk; mk++) {               if (tmp1[i][msk][mk] == 0) continue;               for (long long mkk = 0; mkk < allkk; mkk++) {                 cnt[mkk << (k) | s[i][j] << (k - 1) | mk] +=                     tmp2[j][all ^ msk][mkk] * tmp1[i][msk][mk];               }             }           }     }     for (long long i = 0; i < (1 << (n - 1)); i++) printf( %lld  , cnt[i]);     return ~~(0 ^ 0 ^ 0);   }   