c++ rombo de pazcal

#include<iostream>
using namespace std;
int main()
{

int n;
cout<<"ingrese un numero:";
cin >>n;
for (int j =0; j<n; ++j)
{
for (int i =0; i<n-j-1; ++i)
cout<<" ";
for (int i =0; i<2*j+1; ++i)
cout<<"*";
cout<< endl ;
}
for (int j=n-2;j>=0;--j)
{
for (int i =0; i<n-j-1; ++i)
cout<<" ";
for (int i =0; i<2*j+1; ++i)
cout<<"*";
cout<< endl ;
}
return 0;

}