Initialize TWO integer arrays of different sizes. Merge the input arrays and create a new array. Then print the new array in reverse order.

For example,

Array$\_1=\{10,20,30,40,50\}$

Array$\_2=\{1,2,3,4,5,6,7,8\}$

Output: $876543215040302010$

Write and explain the code in Cpp$.$