void mem() {
    int* newBuffer = new int[capacity * 2 + 2];
    memcpy(newBuffer, buffer, sizeof(buffer)*capacity);
    delete[] buffer;
    buffer = newBuffer;
    newSize = capacity * 2 + 2;
}
//Добавление нового элемента в массив.
void add_element(const int& element) {
    if (capacity == newSize) {
        mem();
        }
    buffer[capacity] = element;
    capacity = capacity + 1;
}