Sliding Window Sum

Code

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    int sum = 0, start = 0, end = 0;
    while(end < n){
        while(((end-start) < k) && (end < n)){
        sum+=arr[end];
        end++;
        }
    fprintf(stdout,"%d ",sum);
    sum -= arr[start];
    start++;
    }   
}

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