using ssize_t = signed long long;
using size_t = unsigned long long;
using int32_t = int;

class MyVector {
private:
   size_t size_ = 0;
   size_t capacity_ = 0;
   int32_t* arr_ = nullptr;

public:
   MyVector();

   MyVector(size_t n);

   MyVector(size_t n, int32_t value);

   ~MyVector();

   MyVector(const MyVector& other);

   MyVector& operator=(const MyVector& other);

   size_t Size() const;

   size_t Capacity() const;

   void Read(size_t n);

   void PrintSize() const;

   void Print() const;
   void PushBack(int32_t x);

   int32_t PopBack();

   void Clear();

   void Insert(int32_t x, size_t k);

   void Erase(size_t k);

   void Resize(size_t new_size);

   void Reserve(size_t new_cap);

   int32_t& operator[](ssize_t index);

   const int32_t& operator[](size_t index) const;

   MyVector& operator^=(const MyVector &other);

   int32_t Max() const;

   int32_t Min() const;

   long long Sum() const;

   long double Mean() const;
};