// using vector of vectors as multidimentional arrayx
// Mikhail Nesterenko
// 4/12/2013

#include <iostream>
#include <vector>

using std::cin; using std::cout; using std::endl;
using std::vector;

 
int main (){

  cout << "Enter row size: ";
  int width;
  cin >> width;
  vector<int> row(width);

  cout << "Enter number of rows: ";
  int length;
  cin >> length;
  vector<vector<int>> a;

  // creating a multidimentional array
  // by entering rows into a vector
  for(int i=0; i < length; ++i) a.push_back(row);


  // initializes the array
  for(int i=0; i < length; ++i)
    for(int j=0; j < width; ++j)
      a[i][j] = i*width+j;

  // output each array element's value                      
  for (int i=0; i < length; ++i)
    for (int j=0; j < width; ++j)
	cout << "a[" << i << "][" << j << "] = "
             << a[i][j]<< endl;
}