10
-405 -230 252 -393 -390 -259 97 163 81 -129
 3
10000 -10000 10000
 1
-10000
 20
-16 -23 29 44 -40 -50 -41 34 -38 30 -12 28 -44 -49 15 50 -28 38 -2 0

702.333333333333712
 10000.000000000016371
 0.000000000000000
 113.875000000000043

n = int(input())
As = list(map(int, input().split()))

def solve(n, As):
    if n == 1:
        return 0
    if n == 2:
        return abs(As[0] - As[1]) / 2
    x = sum(As) / n
    cumAs = [0]
    cum = 0
    for a in As:
        cum += a - x
        cumAs.append(cum)
    return max(cumAs) - min(cumAs)

print(solve(n, As))
