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 = 1; i <= n; i++) {
            for (int j = 1; j <= i; j++) {
                cout << j << " ";
            }
            
            cout << endl;
        }
    }

    return 0;
}