It was not marked as a spoiler until a moment ago when I marked it.

Not very readable, I get what's going on but I used simmilar solution

He means that this is the most inefficient code for this exercise and if someone thinks that doing O(n**2) when it could be O(n) is best practices that means said person have no idea what constitutes as best practices

But how does nA, a, nB "get" a value? When I use enumerate and type "for i, v in x" i is a non negative integer and v is an element from iterator. So are those variables you use have default value of 0 or how does it work? I never saw someone declaring variables like you do here.

How does this work? I cannoit figure what is nA, a, nB and b. When you get to "elts[a]//nA" what index is [a] pointing to and what number is being used as nA?

If you're going to mutate the original input you can just go with seq1.sort(), seq2.sort() :P

He just clicked attempt until random tests let him pass.

Why do you even care, it has no impact on your creative process or your life and codewars is not a competition.

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