import sys
input = sys.stdin.readline
from decimal import Decimal, getcontext

getcontext().prec = 20

N = int(input())
A = list(map(Decimal, input().split()))

level = sum(A) / N

MIN = Decimal(-10**15)
MAX = Decimal(10**15)

for _ in range(300):
    mid1 = MIN + (MAX - MIN) / 3
    mid2 = MIN + 2 * (MAX - MIN) / 3

    sa1 = (level - mid1) / (Decimal((N + 1) / 2) - 1)
    sa2 = (level - mid2) / (Decimal((N + 1) / 2) - 1)

    score1 = sum((A[i] - (mid1 + i * sa1)) ** 2 for i in range(N))
    score2 = sum((A[i] - (mid2 + i * sa2)) ** 2 for i in range(N))

    if score1 < score2:
        MAX = mid2
    else:
        MIN = mid1

ANS = (MAX + MIN) / 2
sa = (level - ANS) / (Decimal((N + 1) / 2) - 1)

score = Decimal(0)
for i in range(N):
    diff = A[i] - (ANS + i * sa)
    score += diff * diff

print(f'{ANS:.10f} {sa:.10f}')
print(f'{score:.10f}')