i knew i wasnt experienced enough to come up with a smallest sol so i thought of comming up with the biggest.it turns out i did neither of it lol.great job you nerd guys.

The array of IDs may have duplicates but don't need to find or remove them.

so, to make the IDs unique without removing or finding them, I passed the arrays to the set

thank you 👍.it was really useful

They iterate lst, not x, it's called list comprehension, you can read more here: https://www.programiz.com/python-programming/list-comprehension

Edit: didn't mean to post this

Read the error message you get:

TypeError: 'int' object is not iterable

x is an int, you can't make a list of it. Even if you could, it would return a list of the first number.