Your solution times out because you are generating each combination, which is beyond O(N^3).

However, you should opt for a recursive approach.

Thank you for reply, but its shows that You have not earned access to this kata's solutions Solutions are locked for kata ranked far above your rank. Rank up or complete this kata to view the solutions. That's why i can not see the solution. But no hurry in solution now. I will try it again

You need to click that button to unlock it, but you will forfeit the kata and will not be able to get honor for it.

Well, I am curious too about how you earn 1 kyu.

Training && training is the key

And why in the leader bord all people using java script ?

Now, the leaderboard is updated, you may choose the language at the topright dropdown box. You may also to see overall points / authoring && translation points / honor (gained by solving katas only)

If it were up to me, your place in heaven would be assured.
Thank you.

Thanks bro, i came here searching the explanation of this code.

you can use pythontutor.com to see it in action

but slow

That doesn't work since two '(' would cancell out one '}'... instead consider using a dictionary of counts for each. e.g.

if char in '({[': d[char] += 1

if char in '})]': d[char] -= 1

Me too

https://www.codewars.com/kata/566fc12495810954b1000030

samrt

How do you know all this things

1. See people using a library
2. Check its docs
3. ???
4. Profit

If you complete 6000+ katas like him you might learn a trick or two

find a mooc?

Have you tried Googling this question yet? There are tons of great resources online, with varying degrees of depth. Based on your question, it sounds like an optimization course/resource might be more what you want that an algorithms one. There are also plenty of great books out there that work wonders too. :)

You can get honor for many things on Codewars, including creating and solving katas. Read this article for more info:
https://github.com/codewars/codewars.com/wiki/Honor-&-Ranks