Write a C$++$ program to print numbers in a triangle format. Input an integer $H$ which represents the height of the triangle. By using nested loops, output numbers to form the triangle in the console.

Sample inputs $/$ outputs:

Enter helght of the triangle : $11$

Enter height of the triangle : $2$

$1$

$12$

Enter height of the triangle: $3$

$1^1{2}^2$

Enter height of the triangle : $4$

$12$

$123$

$1234$