sliding window c++

#include <iostream>
#include <vector>

using namespace std;

int maxSumSubarray(int arr[], int n, int k) {
    int maxSum = 0, currentSum = 0;

    for (int i = 0; i < k; i++)
        maxSum += arr[i];

    currentSum = maxSum;

    for (int i = k; i < n; i++) {
        currentSum += arr[i] - arr[i - k];
        maxSum = max(maxSum, currentSum);
    }

    return maxSum;
}

int main() {
    int arr[] = {1, 4, 2, 10, 2, 3, 1, 0, 20};
    int n = sizeof(arr) / sizeof(arr[0]);
    int k = 4;

    int result = maxSumSubarray(arr, n, k);

    cout << "Maximum sum subarray of size " << k << ": " << result << endl;

    return 0;
}