2e

#include <iostream>

using namespace std;

int main()
{
    int a, i = 0, s, l = 1, l_n;
    cout << "enter a number: ";
    cin >> a;
    while (i < a) {
        i++;
        s = a - i;
        while (s > 0) {
            cout << " ";
            s--;
        }
        l_n = l;
        while (l_n > 0) {
            cout << "*";
            l_n--;
        }
        l = l + 2;
        cout << endl;
    }
    s = a - 1;
    while (s > 0) {
        cout << " ";
        s--;
    }
    cout << "*";
}