int Hash(string str) {
    int hash = 0;
    for(size_t i = 0; str[i] != '\0'; i++)
        hash = hash * 13 + str[i];
    return hash;
}

bool Add(T key) {
    size_t j = Hash(key) % this->capacity;
    for(size_t i = 0; i < this->capacity; i++) {
        if (this->Table[j] == NIL || this->Table[j] == DEL) {
            this->Table[j] = key;
            this->size++;
            if (float(this->size) / float(this->capacity) >= MAX_ALPHA) this->grow();
            return true;
        } else if (this->Table[j] == key) return false;
        j = (j + (i + 1)) % this->capacity;
    }
    return false;
}