How to remove duplicated items in a list? What's the complexity of your algorithm?

Question

W · Accepted Answer

def rem_dupe(input_list):
    x = set(input_list)
    return [y for y in x]

Sigiloso · Answer

def remove_duplicates(arr):
        return list(dict.fromkeys(arr).keys())

Jerry · Answer

def remove_duplicate(l):
     ...:     res = []
     ...:     n = len(l)
     ...:     if n < 2:
     ...:        return l
     ...:     for i in range(1,n):
     ...:         if l[i-1] != l[i]:
     ...:             res.append(l[i-1])
     ...:     res.append(l[-1])
     ...:     return res

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