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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.
psycho...
amazing code to pass the 2 testcases, but in a Randomized testcase it will fail if it needs to Revert from upper to lower
in your one liner code only do from Lower to upper not the opposite
This comment is hidden because it contains spoiler information about the solution
Clever answer ! sadly i used split & join to do it which might affect the speed, with the lookAhead assertion regex
Wh- Why...