func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int t;     t = 1;     while (t--) {       double n;       cin >> n;       double a[200001], sum = 0;       set<double> s;       for (int i = 0; i < n; i++) {         cin >> a[i];         sum += a[i];       }       for (int i = 0; i < n; i++) {         double z = sum - a[i];         double y = (z / (n - 1));         if (y == a[i]) s.insert(i + 1);       }       cout << s.size() << endl;       for (auto i : s) cout << i <<    ;       cout << endl;     }     return 0;   }   