How can I get a result like this

Question

1
1 2 1
1 3 3 1
1 4 4 4 1

Answer 1

#include <iostream>
using namespace std;

int main() {
for(int I=1;I<=4;I++)
{
for(int j=1;j<((I==1)?I:I+1);j++)
{
if(j==1) cout<<j;
else cout<<I;
}
cout<<"1"<<endl;
}
return 0;
}