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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int n;
  6. long long a[1000005];
  7.  
  8. int main() {
  9.     ios_base::sync_with_stdio(0);
  10.     cin.tie(0);cout.tie(0);
  11.     cin >> n; 
  12.     long long tong = 0;
  13.     for(int i = 1 ; i <= n ; i++){
  14.         cin >> a[i];
  15.         tong = tong + a[i];
  16.     }
  17.  
  18.     sort(a + 1 , a + 1 + n);
  19.  
  20.     long double res = ((long double)a[1] + a[2]) / 2;
  21.     for(int i = 3 ; i <= n ; i++)
  22.         res = (res + a[i]) / 2.0;
  23.  
  24.     cout << fixed << setprecision(5) << res * n - tong << endl;
  25. }
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin 
Standard input is empty
stdout 
0.00000
https://ideone.com/aE1VBj
language:
C++14 (gcc 8.3)
created:
13 days ago
visibility:
public

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