2.Reliability and Maintainability Simulation involves a large number of random variables. The use of dynamic arrays will greatly improve the efficiency of simulation and the scale of problem solving. Please design Vector. This problem requires the implementation of a vector class template, which can realize the storage and access of data. (1) [] operator can only access the existing elements. (2) The add method can automatically expand the internal storage space when accessing. Note that the behavior of this vector is different from that of std:: vector.

Sure, I can help you design a Vector class template to meet your requirements. Here is an example implementation:

template <typename T>
class Vector {
public:
    Vector() : data(nullptr), size(0), capacity(0) {}
    Vector(size_t n) : data(new T[n]), size(n), capacity(n) {}
    Vector(const Vector& other) : data(new T[other.size]), size(other.size), capacity(other.size) {
        std::copy(other.data, other.data + size, data);
    }
    ~Vector() { delete[] data; }

    void add(const T& value) {
        if (size == capacity) {
            capacity = capacity ? capacity * 2 : 1;
            T* new_data = new T[capacity];
            std::copy(data, data + size, new_data);
            delete[] data;
            data = new_data;
        }
        data[size++] = value;
    }

    T& operator[](size_t index) {
        if (index >= size) {
            throw std::out_of_range("Index out of range");
        }
        return data[index];
    }

    const T& operator[](size_t index) const {
        if (index >= size) {
            throw std::out_of_range("Index out of range");
        }
        return data[index];
    }

    size_t getSize() const {
        return size;
    }

private:
    T* data;
    size_t size;
    size_t capacity;
};

This Vector class template uses a dynamically allocated array to store the data. The `add` method automatically expands the internal storage space when accessing and the `[]` operator can only access the existing elements. The behavior of this vector is different from that of `std::vector` in that it does not provide methods such as `push_back` and `reserve`. However, it provides the `getSize` method to get the current size of the vector.

You can use this Vector class template like this:

Vector<int> v;
v.add(1);
v.add(2);
v.add(3);
for (size_t i = 0; i < v.getSize(); ++i) {
    std::cout << v[i] << " ";
}

This will output: `1 2 3`.