Sliding Window Sum

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    unsigned length = n - k + 1;
    int sums[length];

    for (unsigned i = 0; i < length; i++) {
        int sum = 0;
        for (unsigned j = i; j < k + i; j++) {
            sum += arr[j];
        }
        sums[i] = sum;
    }

    for (unsigned i = 0; i < length; i++) {
        printf("%d ", sums[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;
}