Flatten a List Flatten a List
Elementary
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Nicola likes to categorize all sorts of things. He categorized a series of numbers and as the result of his efforts, a simple sequence of numbers became a deeply-nested list. Sophia and Stephan don't really understand his organization and need to figure out what it all means. They need your help to understand Nikolas crazy list.

There...

We need to hide this program from Nikola by keeping it small and easy to hide. Because of this, .

A nested list with integers.

The one-dimensional list with integers.

flat_list([1, 2, 3]) == [1, 2, 3]
flat_list([1, [2, 2, 2], 4]) == [1, 2, 2, 2, 4]
flat_list([[[2]], [4, [5, 6, [6], 6, 6, 6], 7]]) == [2, 4, 5, 6, 6, 6, 6, 6, 7]
flat_list([-1, [1, [-2], 1], -1]) == [-1, 1, -2, 1, -1]

This concept is useful for parsing and analyzing files with complex structures and the task challenges your creativity in writing short code.

0 ≤ |array| ≤ 100
∀ x ∈ array : -2 < x < 2 or x is a list
depth < 10

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