Below functions flatten the nested list of integers (List[List[int]]) into a single list and remove duplicates by leaving only the first occurrences. When the total number of elements is N, choose the one that correctly compares the time complexity with respect to N of each function.

f1 = f3 < f2
f1 = f2 < f3
f3 < f1 = f2
f3 < f1 < f2
f1 = f2 = f3

If the the total number of elements is N, the option that correctly compares the time complexity with respect to N of each function is f3 < f1 < f2.

What does it mean to flatten a list?

Flattening lists is a term that connote the act of changing a multidimensional or any kind of nested list into what we call a one-dimensional list.

Note that For example, the act of changing this list of [[1,2], [3,4]] list to [1,2,3,4] is known as flattening.

So, If the the total number of elements is N, the option that correctly compares the time complexity with respect to N of each function is f3 < f1 < f2.

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