Sliding Window Sum

Code

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    if(k > n || k <= 0) return;
    long long sum = 0;
    for(int i = 0; i < k; i++){
        sum += arr[i];
    }
    printf("%lld ", sum);
    for(int i = k; i < n; i++){
        sum = sum - arr[i - k] + arr[i];
        printf("%lld ", 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;
}

Solving Approach