pattern7.cpp

#include <iostream>

using namespace std;

/*
here n = 4
*                 * 
* *             * * 
* * *         * * * 
* * * *     * * * * 
* * * * * * * * * * 
* * * * * * * * * *
* * * *     * * * *
* * *         * * *
* *             * *
*                 *
*/

int main()
{
    int n;
    cin >> n;

    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= i; j++)
        {
            cout << "*" << " ";
        }
        for (int k = 1; k <= (2 * n - 2 * i); k++)
        {
            cout << " " << " ";
        }
        for (int j = 1; j <= i; j++)
        {
            cout << "*" << " ";
        }
        cout << endl;
    }
    for (int i = n; i >= 1; i--)
    {
        for (int j = 1; j <= i; j++)
        {
            cout << "*" << " ";
        }
        for (int k = 1; k <= (2 * n - 2 * i); k++)
        {
            cout << " " << " ";
        }
        for (int j = 1; j <= i; j++)
        {
            cout << "*" << " ";
        }
        cout << endl;
    }

    return 0;
}