Sliding Window Sum

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    // Your logic here
    if (k > n) return;  // Invalid input

    int sum = 0;

    for (int i = 0; i < n; i++) 
    {
        sum += arr[i];  // Add current element

        if (i >= k - 1) 
        {
            // When window is ready, print sum
            if (i == k - 1)
                printf("%d", sum);
            else
                printf(" %d", sum);

            sum -= arr[i - k + 1];  // Remove the element going out of the window
        }
    }
}

int main() {
    int n, k, arr[100];
    scanf("%d %d", &n, &k);
    for (int i = 0; i < n; i++) scanf("%d", &arr[i]);

    sliding_window_sum(arr, n, k);
    return 0;
}