func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 200005;   int n, a[maxn], total;   void solve() {     vector<int> ans;     for (int i = 1; i <= n; i++) {       if (a[i] * n == total) ans.push_back(i);     }     cout << (int)ans.size() << endl;     for (int i = 0; i < ans.size(); i++) {       if (i) printf(   );       cout << ans[i];     }     cout << endl;   }   int main() {     cin >> n;     total = 0;     for (int i = 1; i <= n; i++) {       cin >> a[i];       total += a[i];     }     solve();     return 0;   }   