干草

#include<iostream>
using namespace std;
const int N = 10010;
int a[N];
int main()
{
    int n, sum = 0;
    cin >> n;
    int are = 0;
    for(int i = 1; i <= n; i ++)cin >> a[i], are += a[i];
    are /= n;
    int ans = 0;
    for(int i = 1; i <= n; i ++)
    {
      ans += abs(a[i] - are); 
    }
    cout << ans / 2 <<endl;
}