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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This brute force method timed out on my computer.
This comment is hidden because it contains spoiler information about the solution
Nice solution, two comments:
-the use of the variable 'l' has two distinct uses which detracts from readability. Suggest using a different variable name than 'l' within the fix function.
-swapping the two variables can be done with a,b = b,a in a single line