Template: 4. SLIDING WINDOW — Fixed Size K

4. SLIDING WINDOW — Fixed Size K

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def sliding_window_fixed(arr, k):
    window_sum = sum(arr[:k])
    best = window_sum
    for i in range(k, len(arr)):
        window_sum += arr[i] - arr[i - k]
        best = max(best, window_sum)
    return best


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