void bucketSort(int arr[], int size) {
    list** arrayoflists = new list * [size];
    for (int i = 0; i < size; i++) {
        arrayoflists[i] = new list;
    }
    for (int i = 0; i < size; i++) {
        arrayoflists[arr[i]]->AddOneElement(arr[i]);
    }
    int index = 0;
    for (int i = 0; i < size; i++) {
        while (arrayoflists[i]->head!= NULL)
        {
            arr[index] = arrayoflists[i]->head->key;
            arrayoflists[i]->head = arrayoflists[i]->head->next;
            index++;
        }
    }
}