#include <iostream.h>
#include <conio.h>
void main()
{
int n,i,j,k,t;
k=2*n-1;
t=n-i;
cout<<"Nhap n: ";cin>>n;
for (i=1;i<=2*n-1;i++)
{
for(j=i-n;j>0;j--)
cout<<" ";
for(j=1;j<=i;j++)
if(j>2*n-i)cout<<" ";
else
cout<<"*";
cout<<endl;
}
getche();
}

#include <iostream.h>
#include <conio.h>
void main()
{
int n,i,j,k,t;
k=2*n-1;
t=n-i;
cout<<"Nhap n: ";cin>>n;
for (i=1;i<=2*n-1;i++)
{
for(j=1;j<=n;j++)
if(i-j==n-1||i==j ||j==1 && i<=n||j==n&&i>n)
cout<<"*";
else cout<<" ";

cout<<endl;
}
getche();
}