Sliding Window Sum

Code

#include <stdio.h>

void sliding_window_sum(int a[], int n, int k) {
    int sum = 0;
    for(int i=0; i<n; i++){
        if(i<=k-1) sum+=a[i];
        else sum+=(a[i] - a[i-k]);
        if(i>=k-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;
}

Solving Approach