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/**

* Function to find the maximum sum of a subarray of fixed size k.

* @param {number[]} arr - The input array of numbers.

* @param {number} k - The fixed size of the subarray.

* @returns {number} - The maximum sum of any subarray of size k.

* @throws {RangeError} - If k is larger than the array length or less than 1.

export function maxSumSubarrayFixed(arr, k) {

if (k > arr.length || k < 1) {

throw new RangeError(

'Subarray size k must be between 1 and the length of the array'

)

}

let maxSum = 0

let windowSum = 0

for (let i = 0; i < k; i++) {

windowSum += arr[i]

}

maxSum = windowSum

for (let i = k; i < arr.length; i++) {

windowSum += arr[i] - arr[i - k]

maxSum = Math.max(maxSum, windowSum)

}

return maxSum

}