知识点：

循环控制：

循环输出图形 

#include <iostream>
using namespace std;

int main() {
    int n;

    while (cin >> n) {
        for (int row = 1; row <= n; row++) {
            for (int space = n - row; space >= 1; space--) {
                cout << " ";
            }
            cout << "*";
            cout << endl;
        }
    }

    return 0;
}