---

#include<iostream>
#include<vector>
#include<fstream>
#include<string>
using namespace std;

class VectorRF {
	int* data;
	int col;
	int cap;
	void resize() {
		cap++;
		int* new_data = new int(cap);
		for (int i = 0; i < col; i++)
			new_data[i] = data[i];
		delete data;
		data = new_data;
	}
	void resize2() {
		cap+=2;
		int* new_data = new int(cap);
		for (int i = 0; i < col; i++)
			new_data[i + 1] = data[i];
		delete data;
		data = new_data;
	}
public:
	VectorRF()
	{
		col = 0;
		cap = 1;
		data = new int(cap);
	}
	int size() 
	{
		return col;
	}
	int clear()
	{
		delete[] data; 
		VectorRF();
	}
	void push_back(int val)
	{
		resize();
		data[col++] = val;
	}
	void push_front(int val)
	{
		resize2();
		data[0] = val;
		col++;
	}
	int& at(int index)
	{
		if (index < 0 || index >= col)
			throw "Index out of range";
		return data[index];
	}
	int& operator [] (int index) // запись и чтение 
	{
		return data[index];
	}
	const int& operator [] (int index) const // чтение
	{
		return data[index];
	}
};
int main() 
{
	VectorRF vec;

	
	vec.push_front(5);
}