#include <iostream>

using namespace std;

​

int main() {

​

    int rows;

​

    cout << "Enter number of rows: ";

    cin >> rows;

​

    for(int i = 1; i <= rows; ++i) {

        for(int j = 1; j <= i; ++j) {

            cout << "* ";

        }

        cout << "\n";

    }

    return 0;

}

1

1 2

1 2 3

1 2 3 4

1 2 3 4 5