In ra tam giác cân ngược

// in ra tam giac can nguoc
// Khai bao cca ham thu vien
#include <iostream.h>

void main()
{
    int n;
    cout <<"Nhap kich thuoc tam giac: "; cin>>n;
    cout <<"\n\n";

    int a=(2*n-1);
    int b=(a /2+1);

    for (int i=1;i<=n;i++)
    {
        for (int j=1;j<=a;j++)
        {
            if (i==1) cout <<"*";
            else if ((j<i) || (j>a+1-i)) cout <<" ";
            else cout <<"*";
        }
        cout <<"\n";
    }

    cout <<"\n\n";
}