Массив из вектора

#include <iostream>
#include <vector>
using namespace std;
int get(const vector<vector<int>> & matrix)
{
 
    for (unsigned row = 0; row < matrix.size(); row++)
    {
        cout<<endl;
        for (unsigned column = 0; column < matrix[row].size(); column++)
        {
            cout<<matrix[row][column]<<" ";
        }
 
    }
 
    return 0;
}
 
int main()
{
    vector<vector<int>> matrix(4); // Four rows
    for (unsigned i = 0; i < 4; i++)
        matrix[i] = vector<int>(4); // Each row has four columns
 
    matrix[0][0] = 1; matrix[0][1] = 2; matrix[0][2] = 3; matrix[0][3] = 4;
    matrix[1][0] = 5; matrix[1][1] = 6; matrix[1][2] = 7; matrix[1][3] = 8;
    matrix[2][0] = 9; matrix[2][1] = 10; matrix[2][2] = 11; matrix[2][3] = 12;
    matrix[3][0] = 13; matrix[3][1] = 14; matrix[3][2] = 15; matrix[3][3] = 16;
 
 
 
    cout << get(matrix) << endl;
 
    return 0; }

get(matrix);
cout << endl;

    vector<vector<int>> matrix(4,vector<int>(4));
    for (int i = 0; i < 4; i++)
    {
        int* p = &matrix[i][0];
        for (int j = 0; j < 4; j++,++p)
            *p = i*4+j+1;
    }
    get(matrix);

void get(const vector<vector<int>> & matrix)

void get(const vector<vector<int>>& matrix)
{
    cout << endl;
    for (auto row = matrix.begin(); row != matrix.end(); ++row)
    {
        for (auto col = row->begin(); col != row->end(); ++col)
            cout << setw(3)<<*col;
        cout << endl;
    }
}
void set(vector<vector<int>>& matrix)
{
    int i = 1;
    for (auto row = matrix.begin(); row != matrix.end(); ++row)
    {
        for (auto col = row->begin(); col != row->end(); ++col, i++)
            *col = i;
    }
}
int main()
{
    vector<vector<int>> matrix(4,vector<int>(4));
    set(matrix);
    get(matrix);
    system("pause");
    return 0;
}