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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.
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Not an issue
Then how is [1,3] a subsequence of [1,2,3] as stated in the example?
Hi, I'm the original author of this Kata (Ruby version). Author of the haskell version didn't understand this Kata properly, and indeed added a DFS version instead of BFS.
I have learned haskell to fix this. I added a BFS solution and a correct buildTree (thanks to @nickie for providing one). Please take a look again.
Cheers, I thought I'd tried that too, but there was a bug in the code. It's working now.
It isn't a set, but a sequence/list. The title "power set" is a little bit misleading. You need to return the set of all subsequences, not the set of all subsets, e.g.
I've implemented a solution for this problem in Haskell, but when I submit it, it fails for tests with the input consisting of lists of zeros, eg, [0,0,0,0] or [0,0,0,0,0,0,0,0]. What is the expected solution for this? If this was a set, then this would be an invalid input since there can't be duplicates, correct? I'm removing any duplicates, which results in the set , which should have the power set [, ], but this is not being accepted. Any suggestions?
This has been reported several times, but the author isn't active anymore. See the issues by @muesli4, @karoyakani, @knotman90, @Thom and @pcapriotti.
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I have a solution that works fine under ghci and gives the correct answer without any visible delay. However, when I paste it into the Codewars editor and run the test (the same data tested under ghci on my laptop), it says the the submission timed out. I don't think it's a performance issue since it works quite fast on a dual-core laptop (I'm not using any parallel libs, in fact nothing other thatn Prelude). Any suggestions?