Question

I have this list:

mylist = [20, 30, 25, 20, 30]

After getting the duplicated values indexes using

[i for i, x in enumerate(mylist) if mylist.count(x) > 1]

the result is:

`[0, 1, 3, 4]` 

having two pairs of duplicated values. I’d like to know, how can i get only the higher duplicated value? In this list it is 30 or any of it’s indexes, 1 or 4, instead of the whole list of duplicated values.

Regards…

Answer 1

This one is O(n)

>>> from collections import Counter
>>> mylist = [20, 30, 25, 20, 30]
>>> max(k for k,v in Counter(mylist).items() if v>1)
30