func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     while (cin >> n) {       int res[100];       memset(res, 0, sizeof(res));       for (int i = 0; i < n; ++i) {         for (int j = 0; j < n; ++j) {           int r;           cin >> r;           if (i < j) continue;           switch (r) {             case 1:               ++res[i];               break;             case 2:               ++res[j];               break;             case 3:               ++res[i];               ++res[j];             default:               break;           }         }       }       int count = 0;       for (int i = 0; i < n; ++i) {         if (res[i] == 0) {           res[count++] = i + 1;         }       }       cout << count << endl;       if (count > 0) {         for (int i = 0; i < count; ++i) {           cout << res[i] <<    ;         }         cout << endl;       }     }     return 0;   }   