Sliding Window Sum

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    int i=0,j=0;
    int sum = 0;
    while(i<n && j<n)
    {
        if(j-i < k)
        {
            sum += arr[j];
            j++;
        }
        if(j-i == k)
        {
            printf("%d ",sum);
            sum -= arr[i];
            i++;
        }
    }
}

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;
}