Sliding Window Sum

Code

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    // Your logic here
    if (n < k) return;
    if(k != 1)
    {
    int sum = 0;
    int out[k] = {0};
    // first window
    for (int i = 0; i < k; i++)
        sum += arr[i];

    out[0] = sum;
    printf("%d ",out[0]);

    // slide window
    for (int i = k; i < n; i++) {
        sum += arr[i];        // add entering element
        sum -= arr[i - k];    // remove leaving element
        out[i - k + 1] = sum;
        printf("%d ",out[i-k+1]);
    }
    }
    else
    {
        for (int i = 0; i < n; i++)
            printf("%d ",arr[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;
}

Solving Approach