2445번: 별찍기 - 8

#include<iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    for (int i = 0; i < n; ++i)
    {
        for (int j = 0; j < i+1; ++j)
            cout << "*";
        for (int j = (n-i) * 2; j > 2; --j)
            cout << " ";
        for(int j = 0; j < i+1; ++j)
            cout << "*";
        cout << endl;
    }
    for (int i = n - 1; i > 0; --i)
    {
        for (int j = 0; j < i; ++j)
            cout << "*";
        for (int j = (n - i) * 2; j > 0; --j)
            cout << " ";
        for (int j = 0; j < i; ++j)
            cout << "*";
        cout << endl;
    }
    return 0;
}