func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[200010], n, S, T;   vector<int> A;   int main() {     scanf( %d , &n);     for (int i = 0; i < n; i++) scanf( %d , a + i), S += a[i];     for (int i = 0; i < n; i++)       if (S - a[i] == (long long)a[i] * (n - 1)) A.push_back(i + 1);     printf( %d n , (int)A.size());     for (int i = 0; i < (int)A.size(); i++)       printf( %d%c , A[i], i == (int)A.size() - 1 ?   n  :    );     return 0;   }   