func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     int n;     cin >> n;     bool taken[n + 1];     for (int i = 0; i < n + 1; i++) taken[i] = 0;     int cc = 0;     for (int i = 1; i < n + 1; i++) {       for (int j = 1; j <= n; j++) {         int a;         cin >> a;         if (a == 2 && !taken[j]) taken[j] = 1, cc++;         if (a == 3) {           if (!taken[i]) taken[i] = 1, cc++;           if (!taken[j]) taken[j] = 1, cc++;         }       }     }     cout << n - cc << endl;     for (int i = 1; i < n + 1; i++)       if (!taken[i]) cout << i <<    ;     return 0;   }   