Codeforces Testing Round #3 134A - Average Numbers Solution

 

Problem Link: https://codeforces.com/problemset/problem/134/A

Solution in C++:

1. /// La ilaha illellahu muhammadur rasulullah
2. ///******Bismillahir-Rahmanir-Rahim******///
3. /// Abul Hasnat Tonmoy
4. /// Department of CSE,23rd batch
5. /// Islamic University,Bangladesh
6. ///**********ALLAH IS ALMIGHTY************///
7. #include <bits/stdc++.h>
8. using namespace std;
9. int main()
10. {
11. long long n,i;
12. double s=0,av;
13. cin>>n;
14. long long a[n+1];
15. for(int i = 1 ; i <=n ; i++) cin >> a[i], s+=a[i];
16. vector < long long > v;
17. for ( i = 1 ; i <=n ; i++){
18. s=s-a[i];
19. av=s/(n-1);
20. s=s+a[i];
21. if(av==a[i])v.push_back(i);
22. }
23. if(v.size()==0)cout<<"0"<<endl<<endl;
24. else {
25. cout<<v.size()<<endl;
26. for(auto it:v)cout<<it<<" ";
27. }
28. }