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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.
The tests are correct. You are very likely having a performance issue in your solution.
If you can't solve your problem by following the Troubleshooting Guide, post your code, properly marked up and spoilered, and people can have a look.
Random tests are 40 times 20 - 300 and 20 times 300 - 4000 BTW.
GHC 8.2ran a lot slower than the newGHC 8.8; using that might also help ( though setup time has gone from 2 to 3 seconds unfortunately ).i dont think its computed on ur computer but actually code wars servers. My solution does it for 4000! 40 times in under 5 in IntelliJ but it times out when i submit