I am trying to make 2 fixed lists.

List1( 1 2 3)

LIst2(1 2 5)

And I need to compare every two numbers and find how many different numbers group. How can do that?

Ex:

I compare 1 v 1, they are the same

I compare 2 v 2, they are the same

I compare 3 v 5, they are different,

So the total different number group is 1

Use for loop or something?

I just need pseudocode.

Thanks