打印 n 階實心菱形:

#include <iostream>
using namespace std;

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

2-2的題目不怎么會做我決定先放下，我好弱智啊