func_code_string: #include <bits/stdc++.h>   using namespace std;   const double error = 1e-15;   const double pi = 2 * acos(0);   const int maxn = (int)1e5 + 10;   const int mod = (int)1e9;   int dx[] = {0, -1, 0, +1, -1, -1, +1, +1};   int dy[] = {-1, 0, +1, 0, -1, +1, +1, -1};   long A[205][200], B[200];   vector<int> v;   int main() {     ios_base::sync_with_stdio(0);     long i, j, n, m;     cin >> n;     for (i = 1; i <= n; i++)       for (j = 1; j <= n; j++) {         cin >> A[i][j];         if (A[i][j] == 1) {           B[i] = 1;         } else if (A[i][j] == 2) {           B[j] = 1;         } else if (A[i][j] == 3) {           B[i] = 1;           B[j] = 1;         }       }     m = 0;     for (i = 1; i <= n; i++)       if (B[i] == 0) {         m++;         v.push_back(i);       }     cout << m << endl;     for (i = 0; i < m; i++) cout << v[i] <<    ;     return 0;   }   