#include <iostream>
#include <cstdlib>
using namespace std;

/* Output these 10 lines:
 
XXXXXXXXXXXXXXXXXXXX
 XXXXXXXXXXXXXXXXXXXX
  XXXXXXXXXXXXXXXXXXXX
   XXXXXXXXXXXXXXXXXXXX
    XXXXXXXXXXXXXXXXXXXX
     XXXXXXXXXXXXXXXXXXXX
      XXXXXXXXXXXXXXXXXXXX
       XXXXXXXXXXXXXXXXXXXX
        XXXXXXXXXXXXXXXXXXXX
         XXXXXXXXXXXXXXXXXXXX

The variable "row" starts at 0 because it is the number of spaces on each line.
The variable "col" starts at 0, to agree with "row".
*/

int main()
{
	int nrows {10};
	int ncols {20};

	for (int row {0}; row < nrows; ++row) {
		//Output the spaces (if any) in front of the line.
		for (int spaces {0}; spaces < row; ++spaces) {
			cout << " ";
		}

		//Output the line itself.
		for (int col {0}; col < ncols; ++col) {
			cout << "X";
		}

		cout << "\n";
	}

	return EXIT_SUCCESS;
}