vector构造二维数组(c)

#include   <vector> 
using namespace std;
int   ()
{
    vector <vector<int>>   array(3);
    for (int i = 0; i <3; i++)
        array[i].resize(3);
    for (int i = 0; i <3; i++)
        for (int j = 0; j <3; j++)
            array[i][j] = (i*j);
    for (int i = 0; i <3; i++)
    {
        for (int j = 0; j <3; j++)
            cout <<array[i][j] << "   ";
        cout <<endl;
    }
    array.resize(5);
    array[3].resize(3);
    array[4].resize(3);
    
    cout << endl << endl;
    for (int i = 0; i <5; i++)
        for (int j = 0; j <3; j++)
            array[i][j] = (i*j);
    for (int i = 0; i <5; i++)
    {
        for (int j = 0; j <3; j++)
            cout <<array[i][j] << "   ";
        cout <<endl;
    }
}