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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.
Why is num^expr and expr^expr not implemented in the haskell solution?
It seems like whether the solution passes or not may depend on server load...
I just couldn't make it less than 15s yesterday and the exactly same solution passed today morning. (in utc+8 time)