func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[200005];   int main() {     int n;     scanf( %d , &n);     int sum = 0;     for (int i = 1; i <= n; ++i) {       scanf( %d , &a[i]);       sum += a[i];     }     vector<int> ans;     for (int i = 1; i <= n; ++i) {       if ((sum - a[i]) % (n - 1) == 0 && (sum - a[i]) / (n - 1) == a[i]) {         ans.push_back(i);       }     }     printf( %d n , (int)ans.size());     for (auto p : ans) {       printf( %d n , p);     }   }   