#include<iostream>
using namespace std;

int main()
{
int i,j,n;
cout<<"Enter the No Of Row\n";
cin>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=i;j++)
        {
            cout<<i<<" ";
        }
        cout<<"\n";
    }

}

Output:

Enter the No Of Row

7

1 

2 2 

3 3 3 

4 4 4 4 

5 5 5 5 5 

6 6 6 6 6 6 

7 7 7 7 7 7 7