Sliding-window technique: How to move a window forward by more than one unit each time?

Question

Now I am wondering how to move a window forward by 4 uints or other number of units instead of only one unit each time. Could you please give me clues about it?

My code is like this:

import sys
INT_MIN = -sys.maxsize - 1
def maxSum(arr,n,k):
max_sum = INT_MIN
for i in range(n-k+1):
    current_sum = 0
    for j in range(k):
        current_sum = current_sum + arr[i+j]
    print(current_sum)
    max_sum = max(current_sum, max_sum)
return max_sum

arr = [1,4,2,10,2,3,1,0,20,1,1,2,3,4,5,6,3,2,4,5,1,4,5]
k = 4
n = len(arr)

Answer 1

You mostly have a correct answer already. You wrote

for i in range(n - k + 1):

All that is needed is to specify a step of k :

for i in range(0, n - k + 1, k):

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nit: this code

    current_sum = 0
    for j in range(k):
        current_sum = current_sum + arr[i + j]

could be written with slice notation as current_sum = sum(arr[i:i + k]) .

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Pandas offers an implementation that might be of interest to you.