Sliding Window Sum

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    // Your logic here
    int sum = 0;
    for (int i = 0; i < n - k + 1; i++){
        if(i == 0){
            for(int j = 0; j < k; j++){
                sum += arr[j];
            }
        }else{
            sum = sum - arr[i - 1] + arr[k + i - 1];
        }
        printf("%d ", sum);
    }
}

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;
}