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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.
can someone explain me this code?
This comment is hidden because it contains spoiler information about the solution
it fails for '1.2.3.4\n';
Good solution if simplicty is of primary concern. If performance is of primary concern, though, then potentially faster solutions exist, depending on whether the IDs are pre-sorted and on the range and number of IDs.