What is time complexity of a list to set conversion?

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Question :

What is time complexity of a list to set conversion?

I’ve noticed the table of the time complexity of set operations on the python official website. But i just wanna ask what’s the time complexity of converting a list to a set, for instance,

l = [1, 2, 3, 4, 5]
s = set(l)

I kind of know that this is actually a hash table, but how exactly does it work? Is it O(n) then?

Asked By: lxuechen

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Answer #1:

Yes. Iterating over a list is O(n) and adding each element to the hash set is O(1), so the total operation is O(n).

Answered By: Mad Physicist

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