I still used "".join() thinking I was handling lists. but it works with strings too

You don't need to do that actually, if the slice range doesn't exist, it just returns an empty string

I was very confused about that too. Late reply I know but still

Well done !!!

I really like this one

If there are several items which value is equal to diff, what will it return?

I forgot about this method are you kidding me

That increases the complexity to O(n^2). This is the best version with O(n) complexity.

Wow, Python. You surprised me again.

158+ like him

same ans but took me 5mins

I wanted to do that but I was too lazy to search on how to use map func

bro for me you also need to write if len(s) == 2: return " " i think it would be better and nice

• typo fixed
• code examples made language-agnostic