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

    return 0;
}