题解 | #空心三角形图案#

#include <iostream>

using namespace std;

int main()
{
    int n;
    while (cin >> n)
    {
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < n; j++)
            {
                if (j == 0 || i == j || i == n - 1)
                {
                    cout << "* ";
                }
                else
                {
                    cout << "  ";
                }
            }
            cout << endl;
        }
    }
}