How to compare all the elements of a list with each other?

Question

How to compare all the elements of a list with each other?

Answer 1

Марсель Халимов None represents default value, comp means any comparison based on a[i] and a[j].

Answer 2

I deleted that invalid junk.

Answer 3

It creates a 2D list:
-1 + + + +
...
2 + + + +
1 + + + +
0 + + + +
0 1 2 ... -1

Which is filled with results of a's values operated with each others.

Answer 4

Here I created multable, but the operation and list can be changed to any.
https://code.sololearn.com/cniZbx4nYXWS/?ref=app

Answer 5

Марсель Халимов (None is left when item is compared with itself), but here:

https://code.sololearn.com/ceSiOb6byVJC/?ref=app

Answer 6

What does mean None and comp in your code

Answer 7

And I should compare all the elements and find out how many similar items are there

Answer 8

So how it is does

Answer 9

find out how many similar items are there