Maximum mean subarray

topic

input：[ 1, 12, -5, -6, 50, 3 ]，4
output：12.75

Ideas

Sliding the window, first add the previous sum to the next value of j, and then subtract the first value to form a valid window.

Code

def findMaxnumsverage(n,w):
    windows_sum = 0
    for i in range(w):
        windows_sum += n[i]
    res = windows_sum
    for j in range(w,len(n)):
        windows_sum = windows_sum + n[j] - n[j-w]
        res = max(res,windows_sum)
    return res/w
nums = [ 1, 12, -5, -6, 50, 3 ]
a = findMaxnumsverage(nums, 4)
print(a)