#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

__float128 func(const vector<int> &a, double g, double d) {
  int n = a.size();
  __float128 x = g - d * (n-1) / 2;

  __float128 ret = 0;
  REP (i, n) {
    ret += (a[i] - x) * (a[i] - x);
    x += d;
  }
  
  return ret;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;
  vector<int> a(n);
  REP (i, n) cin >> a[i];

  double g = 0.0;
  REP (i, n) g += a[i];
  g /= n;

  double lo = -1e18;
  double hi = 1e18;

  while (hi - lo > 1e-9) {
    double m1 = (2 * lo + hi) / 3;
    double m2 = (lo + 2 * hi) / 3;

    if (func(a, g, m1) < func(a, g, m2))
      hi = m2;
    else
      lo = m1;
  }

  cout << fixed << setprecision(12);
  cout << g - lo * (n-1)/2 << " " << lo << endl;
  cout << (double)func(a, g, lo) << endl;
  
  return 0;
}