from collections import defaultdict,deque
import sys,heapq,bisect,math,itertools,string,queue,datetime
sys.setrecursionlimit(10**8)
INF = float('inf')
mod = 10**9+7
eps = 10**-7
def inpl(): return list(map(int, input().split()))
def inpls(): return list(input().split())

N = int(input())
aa = inpl()

SUMa = sum(aa)
SUM2a = 0
SUMaa = 0
for i in range(N):
	SUM2a += aa[i]*(2*i)
	SUMaa += aa[i]**2

def calc(A,d):
	tmp = SUMaa - 2*SUMa*A - SUM2a*d
	tmp += A**2*N		#A^2
	tmp += (N-1)*N*A*d	#2Ad
	tmp += (N-1)*N*(2*N-1)//6*d**2 #d^2
	return tmp

def calc_d(A):
	xx =[0]*4
	xx[0] = -10**5/N
	xx[3] = 10**5/N
	xx[1] = (xx[0]*2 + xx[3]) /3
	xx[2] = (xx[0] + xx[3]*2) /3

	yy = [0]*4
	for i in range(4):
		yy[i] = calc(A,xx[i])

	for _ in range(300):
		if yy[1] < yy[2]:
			xx[3] = xx[2]
			xx[1] = (xx[0]*2 + xx[3]) /3
			xx[2] = (xx[0] + xx[3]*2) /3
		else:
			xx[0] = xx[1]
			xx[1] = (xx[0]*2 + xx[3]) /3
			xx[2] = (xx[0] + xx[3]*2) /3

		yy[1] = calc(A,xx[1])
		yy[2] = calc(A,xx[2])

	return yy[1],xx[1]


xx =[0]*4
xx[0] = -10**5*2
xx[3] = 10**5*2
xx[1] = (xx[0]*2 + xx[3]) /3
xx[2] = (xx[0] + xx[3]*2) /3

yy = [0]*4
for i in range(4):
	yy[i],d = calc_d(xx[i])
by = yy[1]

for _ in range(1000):
	if yy[1] < yy[2]:
		xx[3] = xx[2]
		xx[1] = (xx[0]*2 + xx[3]) /3
		xx[2] = (xx[0] + xx[3]*2) /3
	else:
		xx[0] = xx[1]
		xx[1] = (xx[0]*2 + xx[3]) /3
		xx[2] = (xx[0] + xx[3]*2) /3

	yy[1],d = calc_d(xx[1])
	yy[2],d = calc_d(xx[2])


print(xx[1],d)
print(yy[1])