Sliding Window Sum

Code

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k)
{
    if (k > n) return;

    int sum = 0;

    // First window
    for (int i = 0; i < k; i++)
        sum += arr[i];

    printf("%d ", sum);

    // Slide
    for (int i = k; i < n; i++)
    {
        sum = sum + arr[i] - arr[i - k];
        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