a11.cpp

#include <iostream>
using namespace std;
int main()
{
    int n, k=1;
    cout << "Input";
    cin >> n;

    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= i; j++)
        {
            cout << k++ <<'\t';
            
        }
        cout << endl;
    }
}