Creating Patterns in C++

There is probably a really simple solution to this, but I just can't figure it out. I have created a patter of asterisks that is generated by this code:

#include <iostream>
using namespace std;


int main()
{

    int i, j;
    for (i = 0; i<=10; i++)
    {
        for (j = 0; j<i; j++)
            cout << "*";
        cout << "\n";
    }
    cout << "\n\n";
    for (j = 10; j>0; j--)
    {
        for (i = 0; i<j; i++)
            cout << "*";
        cout << "\n";
    }
    cout << "\n";
    for (j = 10; j>0; j--)
    {
        for (i = 0; i<j; i++)
            cout << "*";
        cout << "\n";
    }
    cout << "\n";
    for (i = 0; i<=10; i++)
    {
        for (j = 0; j<i; j++)
            cout << "*";
        cout << "\n";
    }
    return 0;

}

As you can see the code generates four blocks of asterisk patterns. My issue is that I need the last two blocks to look like this:

**********
 *********
  ********
   *******
    ******
     *****
      ****
       ***
        **
         *

         *
        **
       ***
      ****
     *****
    ******
   *******
  ********
 *********
**********

I am thinking I need another for-loop inside these two that will make each line begin with an appropriate number of blank spaces, but I am stuck trying to formulate this. Any advice would be greatly appreciated.