#include <iostream>

#include <vector>

using namespace std;

int main()

{

    int row, column;

    cin >> row >> column;

    //key code:申请空间

    vector<vector<int> > a(row, vector<int>(column));

    //使用空间

    for (int j = ; j < row; j++)

        for (int k = ; k < column; k++)

            a[j][k] = rand() % ;

    for (int j = ; j < row; j++)

    {

        cout << endl;

        for (int k = ; k < column; k++)

        {

            a[j][k] = rand() % ;

            cout << a[j][k] << "     ";

        }

    }

    return ;

}