Its both experience and logical thinking and understanding of python fundamentals.
We can excel at 2/3 of those which will be good enough.
developing logical thinking is also possible but it comes to some ppl naturally i guess.
#keep_coding

Same dude, it took me like 2 hours. When I saw this I wanted to cry. How are people so good at this? Is it just an experience thing?

I liked the idea of [0]*n, such a simple beauty.
and no everybody knows about heaps. This code does the best out of standard preloaded library.

That simple and elegant "set" function . I keep missing it in my logics.

really like this solution .i exhausted too much brain on my solution.

hi there ,
A newbie here. I have learned some basic of python language. can you suggest how /where should i start learning abt the Complexity O of the programs